Do vacuum tubes reduce resolution?

[@The51DD]

Totally agree with you Paul. I’ve been using tube amplification for the past 6 years or so and it just sounds right to me. It’s hard to explain but let’s just say that it’s easy on the ears and my brain. But as with all components within the chain, there needs to be synergy. I can now say that I’ve nailed it to a point where I can say ‘Yes!’ Still haven’t tried the combo tubes and mosfets so the story or should I say quest (lol) continues. But right now.. happy me! Just for the record , I’m using a Line Magnetic 211ia amp. Tentlabs dac and Tannoy XT6 speakers Gain/ driver tubes are Siemens ECC83 / Tungsram ECC82. Peter

[@neilbeni7744]

For a man that doesn't really use tubes I really appreciate your honesty...

[@user-od9iz9cv1w]

Right on Paul. I do hear lot's of tube amps that are poorly implemented and sacrifice resolution. Typically the issue is with the power tube coupled to a poor quality output transformer. I use all triode amplification but with OTL output stage. It has micro details unmatched by most other systems. It's biggest limitation is the quality of coupling capacitors which can also be upgraded.

[@wa9kzy326]

Once again, Paul, you've come up with an excellent analogy with the orange flavor. Thanks!

[@kenzuercher7497]

Good description, Paul. I build tube guitar amps and we intentionally modify the gain structure and frequency response to "improve" the sound of an electric guitar. A triode voltage amp is a high impedance stage and so the coupling caps are much smaller than a solid state lower impedance voltage amp. I suspect that the smaller caps (I use polypropylene) slow down the transient response far less than using electrolytic caps in the solid state voltage amps. Thus, more details. BTW I use a 60s Harman-Kardon Citation V to listen to music.

[@CoolDudeClem]

I like the soft sound of tubes (or valves as they're called over here), that's why I use one in a mic preamp that I made.

[@draganantonijevic2441]

When vacuum tubes are good, they are rally good. When they are not, well... then they are ''fatter, warmer and generally softer". As Pol said, hybrid settings are probably the best solution ... for perfectionists. For us ordinary mortals: a good solid state or a good vacuum tube system is... Hurray!

[@thefloop2813]

I made a class A single ended tube preamp and impedance matched it to a good decent D amplifier, and wow. Holy crap, rest was history.. Massive wall to wall soundstage, holographic depth. and a detail and clarity in sound i've never experienced before. While yes, also being softer and easier on the ears as well. If tube pre and class D power is this good together, i can only imagine how good the BHK amps sound.

[@NoEgg4u]

Missing from this video is that the tube that Paul held up is available from different manufacturers -- and they all will have different sound. So GG should experiment with different tubes (tube rolling), until he/she finds a set that provides the best sound. Note that often new tubes (manufactured recently) are not always the way to go. In the world of vacuum tubes, there exists "new old stock" (or nos). NOS tubes are old tubes (perhaps several decades old), but are as good as new (they have never been used). Some NOS tubes are plentiful, despite their age. Others will cost more, if their supply is comparatively low. Once a particular NOS tube's supply is exhausted, then that is it for that tube -- as NOS tubes, by definition, are no longer manufactured. Whoever has them for sale, when their supply runs out, then that is it.

[@chriscuthbertson]

You hit the nail on the head... your goal is to make it sound as close to live as possible, not as close to the recording as possible. That explains a lot. So really the most important thing to making it sound as live as possible is how it is recorded, mixed and mastered. How it is played back is second to that. If it was recorded badly it will never sound like the live instruments. What if there never was a 'Live' instrument... for example a song created exclusively on a computer?

[@HiFiInsider]

I like the sound in tube preamp and solid state power amp.

[@maxwattage6631]

Peavey hy-brid , as good as a Fender twin. More testes.

[@Scottlp2]

High current/class A amp or class D? ;-)

[@TheADEROSE]

I have done all vacuum, all SS, combo of both. Combination of the two is the best to my ears. The Rogue Sphinx is one of the best piece of equipment I've purchased in the last ten years. I agree with Paul on a previous spot he did, tubes at the input and SS on the output is truly great.

[@dougg1075]

Al DeRose I did an in home audition of the Sphinx with an audio head buddy of mine who’s a musician and very familiar with the amp I had in that system ( Conrad Johnson Sonograph SA 250 solid state). I asked him to hold his thoughts until we listened for a while, and in the end we both agreed the CA was MUCH better than the Rogue. I was disappointed. I really wanted to like and purchase the Rogue. We both thought it was way less musical (whatever that means). It sounded good no doubt, just flat in comparison. Haven’t auditioned a hybrid since.

[@miltowntubes4142]

Great Video & Much Love 2 All.... Keep Those Tubes Glowing !!

[@Justwantahover]

I had a small tube amp and it was bright but no fatigue what so ever. Sounded so sweet up top, and turning the treble knob right up made it sound way wrong and tinkly by a large measure! But it was so sweet and sounded great even when the treble was floored and heaps too much treble. The best treble from any amp I owned. I own a big NAD and an Audiolab 6000A. That little amp would have smoked both, only if I still had it. I also had other tube amps too, but none as good as that little beast. UNFORTUNEATELY I sold it in the mid '80s. I failed miserably!

[@russmaleartist]

I had an Audio Research tube amp -- at first, it was quite beguiling . . . however, when it came time to replace the tubes at a great expense, I went back to my solid state amp . . . and was surprised at how different the sound was. The warmth was “too sweet”, soft, and the detail definition was lacking in the tubes as compared to the solid state. Sorry . . . it is a matter of preference, taste, and opinion, but in this one . . . I agree with the lady! I could care less about the measurements as a whole -- if my ears find the sound offensive, with distortion, and fatiguing to listen to -- I will trust my ears comparing the music to live any day to people's opinions. Hey, I have to pay for and listen to what I purchased -- and it is going to be pleasing to my ears -- or it is not staying in the system very long.

[@taiefmiah]

I find it's also very different depending on the tube amp. I tried the Manley head amp which I found really gooey sounding,warm to the extent where I found it muddy. Then I heard a dragon inspire iha1 which sounded drier than a lot of solid state amps I have listened too, with really clear, almost emphasised definition when it came to the texture of instruments. It's really odd.althogh one thing I find is most OTC tube amplifiers have something a bit off with the bass and bass control.

[@carlitomelon4610]

Er, russmaleartist, that's: " could NOT care less" (=O) If you COULD care less, you actually care more than less, which means you care a bit (=1 ) or maybe more, no??

[@russmaleartist]

Aw, dry up . . . if you have nothing constructive to say!

[@Magnulus76]

I tried a tube preamp for a while because I was working with an analogue source, and several different tubes (6AK5), and in the end I concluded it added nothing beneficial to the sound. There are tube preamps that do better, but even the higher end ones tend to obliterate certain aspects of the sound, even if its quite subtle and may not be immediately apparent on a stereo setup for music (you'll notice the effect more in movies or games, where precise positioning of audio is important).

[@googoo-gjoob]

@@carlitomelon4610 , if no one else did...i was going to.

[@christopherward5065]

I believe that accuracy is something to strive for. Many manufacturers use valves to add qualities to the signal that are pleasing. Some add sparkle, some add a warmth and so on. There are ways to employ valves that makes accurate sound e.g. as voltage amplifiers in microphone preamplifiers. They have high resolution and good harmonic discrimination. When used correctly they produce playback that is accurate and compelling. You can see valves in cheap products creating a visual aesthetic and subtly messing up the accuracy to let you know they are there. Or else there are high end uses that make compelling sound that is appealing. I guess I am saying that you can use valves to modify a signal or you can use it as a useful tool for perfect amplification.

[@phototristan]

I don't know if actually affects resolution but it's definitely adding things like 2nd order harmonic distortion.

[@MrDanoman812]

Under ALL situations... tune your room to your speakers. I'm running a Carver 1.0t amp and even a cheap Noobsound preamp using audiophile tubes on my Infinity's and it's astoundingly powerful and the imaging is better than you'd imagine in my listening room. (advice given to me years ago and the absolute best thing you can do in your listening area and best money spent after one owns their decent equipment) **honestly...** Thanks Paul for these videos my friend... YOU, Sir are the best. :)

[@dell177]

If you take a good look at schematics of Tektronix and HP oscilloscopes of the 60's and early 70's you will see some of the best engineering ever. I used to do calibration of all the test equipment where I worked and that included repairing all the equipment. One thing became apparent was vacuum tubes in a properly designed circuit are reliable, replacing tubes in the 545 (30 mhz time delayed) scopes was rare enough to be notable AND they helped heat chilly chilly corner where my bench was. I used to have tube power amps (Dyna st70 and then Jolida 502), I gave up on them when the cost of output tubes got stupid. Today I have a Rogue RP5 tube preamp driving a pair of M700 monoblocks (class D all solid state) and I can tell you that combination resolves just fine.

[@wildcat1065]

Couldn't agree more. A tube on the input stage puts flesh on the bones.

[@m.morininvestor9920]

What do you think of the Vali 2 ?

[@biketech60]

My take is tubes reveal the flesh on the bones that ss does not . Solid state voltage amplification adds something to the sound that's not real . My 2 cents worth .

[@dadofshane]

Orange zest in orange juice sounds great. But all oranges are not alike. Sometimes when the orange is near perfect, I would leave the zest out. All tube amps, and ss amps are not equal, so I think some ss amps sound better than some tube amps. I enjoy my Scott 20 watt push pull el84 amp with high efficiency JBL 15in speakers because it sounds very good and is somewhat affordable. If I had a lot of money, $2m, to burn, I'm not sure I would be satisfied or happier with all the confusion of who or what is better. I am happy listening to any very good, or even good hifi. I also find old 78's enjoyable. It's about the music, and I do enjoy the historic overtones of different eras even though it is not as deep of bandwidth, 3d?, Imaging, dynamic, and on and on... I do enjoy the videos, but when Paul describes a macintosh stereo as dad's hifi, it's a little too condescending and I think narrow minded. Maybe I am a little defensive of not having $2-3m to spend on a music replicator, but I do recommend live music when possible. To me there is nothing like the low note on a concert grand Steinway or any good concert.

[@kenfoland]

Vacuum tubes certainly do have their issues. They are much larger than their solid state counterparts. Like a incandescent light bulb, they waste oh so much energy in heating the filaments. The circuit layout must accommodate that heat in a way that it can dissipate without harming other components. And, compared to solid state components, they are noisy. Not only are they noisy, as in distortion. But, they can be terribly microphonic. However, in some applications they are ubiquitous. While searching for a guitar amplifier that could fulfill my needs, I went with a 1968 Fender Bassman. It is heavy. It produces a lot of heat. But, in this application, I don't believe I could have spent my money more wisely. It is wonderfully simple to modify, or repair compared to modern printed circuit board amplifiers. But, best of all, it's so expressive that I can simply vary my pick attack and change the character of the sound produced. You simply cannot get that quality with transistors.

[@catified2081]

I have heard new tubes don't sound as good as old tubes. Tubes in general just sound like a never ending struggle.

[@jhcoverdrive9287]

I've read varying bits on that too. I think there's still enough new old stock around that if you're willing to tinker you could build up your own supply of "premium reserve" tubes so to speak. I don't have a lot of experience with it but I would imagine not all hardware is going to benefit from the better tubes anyway. That's why I just started reading up and bread boarding simple circuits though...just to get a little hands on myself before I decide to really throw down on a DIY project. At the very least I'll have an understanding of it and be able to better choose a product when the time comes to throw down some hard earned $$. In the end, if its a properly designed amp, you'll have to change your tubes every 1-2 years depending on use and other variables...if you're tube rolling, then yeah, you'll be doing more work but if you're tube rolling than I'm guessing it wouldn't be considered a struggle :)

[@taiefmiah]

Old tubes were built in factories by scientists who had the resources to bin components, match and refine their process. New tubes are often built by a few people trying to use them for audio without the same resources, training and environment

[@catified2081]

@@jhcoverdrive9287 there's a guy in my area that has made himself a nice small business making tube amps using old TV tubes. He swears they sound great and last longer.

[@OsborneCox.69.420]

that's a total myth boomer's like to tell younger audiophiles. there are numerous companies that manufacture tubes that are better than ANY old/surplus tubes.

[@ericeastman2427]

I love all tube power and preamp lots of clean organic headroom its like your there of what your listing to and my bass guitar amp Ampeg svt cl 300watt all tube and it is sounds so so so good ive got preamp with mosphet section amps to its not even close

[@HiFiInsider]

the design can also change the sound of the tube amplifier. e.g. OTL or transformer-coupled

[@kylemcgowan8071]

"IF YOU TOUCH IT TOO MUCH YOUR OILS WILL BURN A HOLE IN THE ENVELOPE" uhhh, if you touch a hot 12ax7 too much, it may burn a hole in your hand , but will not affect the envelope. now, an 813, running at 1500v on the plate probably wouldn't like any hand goo on the glass , but i doubt it would burn a hole in it.

[@editorjuno]

Tubes in gain stages don't affect clarity or so-called "resolution" as long as the circuit around them is competently designed -- but tubes in a power amp's output section entail inductive coupling (an output transformer) in order to drive loudspeakers and a big iron core can't help but be at least somewhat detrimental in that regard.

[@lroy730]

Thats a 12AX7 isn't it ? Got a huge collection of NOS for guitar amps.

[@ProDigit80]

I guess it has to do with how well a tube compresses louder signals. Unlike a solid state amp, which hardclips, once the audio wave surpasses the limit, a tube amp, just gradually compresses the signal. The higher the signal, the higher the voltage, the more of the audio signal will be compressed due to the higher voltage being transformed into light. Nowadays they have transistor bulbs. A bulb emulation with the use of several small transistors, in the shape of a bulb. It seems to work quite well! American company as well! But sometimes, bulbs do remove higher frequencies, due to the addition of hiss; and over-pronunciation of mid-frequencies. So yes, most budget tube amps have this problem.

[@undefined624]

I had the exact question in mind with my tube headphone amplifier. Thanks for clearing it up Paul!

[@huskypup3489]

The still picture is not a high-fi amplification tube, but rather a nixie tube, which is used for displaying numbers.

[@kirlu50]

The lore that tubes sound warm, I think, has to do with the type of vintage speakers they were typically player on.

[@johnsweda2999]

I think the term you're looking for is like an oscillation of a wine glass, when you run your finger around the rim of a wine glass a sharp clarity and detail sound. I thought maybe you could use light bulbs in the same way on the output transistors to regulate themselves and give a Walmer feeling. I don't know if anybody has done this?

[@amb3cog]

Okay first it's not a wine glass. It's any glass made from crystal that makes that sound when you run your finger around it. 2nd. Tubes, and light bulbs have almost nothing in common. In fact some tubes aren't even made of glass, and they don't all light up either. Maybe try to use Google, before you post things. That might help.

[@johnsweda2999]

HH Scott you completely misunderstood or understand, doesn't have to be crystal glass any glass will do. Wine glasses generally make the sound more prevalent because of their shape and size. I never said that light bulbs and vacuum tubes are the same I don't need to explain myself to you Paul will understand what I mean. What's with the sarcasm doesn't suit you!!!!😄

[@clovisdacruz6078]

Tubes might not be ideal for certain DACs. I think that’s why some people recommend them for analogue sources like vinyl players. They make distortion sound pleasing. Tubes are wasted on high performing DACs; they are fine on noisy DACs.

[@markgrunzweig6377]

No matter what one does to "fix" orignal source digital", it just doesn't sound very good to me. But, if I want to really listen to music, I have to use headphones, for my my living situation. I like original analoge, mixed & mastered digitally. Preferably HDCD, for I can make custom playlists on Mediaplayer, and hear it at double the resolution of a basic CD. An overall good compromise for me. Custom playlists are very essential for me.

[@russredfern167]

Had Heathkit mono amps with a Heathkit stereo preamp , miss that sound. Class D, yuk!

[@tdevosodense]

To Poul - are you going to use the Korg Nutubes ?

[@68arild]

my preamp use nutube from korg love it

[@peterhaslund]

I am a recent convert, tubes in, mosfets out, just sounds natural to me

[@mstr-rptr]

I have a dac that has a tube preamp built into it. There are two rca outs, one for tube out and one for "solid state" out. I much prefer the solid state output of the dac, sounds much more sharp and fuller to my ears. Listening to tube out is like seeing/watching something without eyeglasses on for me (I have -2.0 prescription). I have WE 396A and GE 5670W tubes on hand and neither sounds good to me compared to solid state.

[@Tubetinkerer]

Paul, why no elaboration on hotter vs colder biasing, and what it means for the sound. Or open loop gain for that matter, or sag, or transformer saturation. Those are the main factors that determine the specific sound of a tube-amp. You know, basically finely tuned distortion ? Resolution sounds kind of... like undefinable hot air, wouldn't you agree ? ;)

[@gregorymalchuk272]

Tubetinkerer THIS!

[@Tubetinkerer]

Gregory Malchuk Thanks. It's all in the name, isn't it ? 😎😉

[@maxwattage6631]

3:00 do not worry

[@3-y86]

This is why many lovers in audio ended in last years. Why so many people are here so toxic? This man gives you information for free. This is sad

[@hugoromeyn4582]

Overly edged edge... That's the explanation of a Hegel class D amp on a pair of B&W speakers with harsh tweeters. I've heard that combination at a local audio store, it was terrible. After that, a class A Esoteric amplifier driving a pair of Sonus-Faber loudspeakers gave me goosebumps all over my body! I Am a tube lover, but the Esoteric beats them!

[@rainman3269]

What make of audio tube do you use in you're Pre amps ???

[@BillyBob-ir6lx]

If you say tubes ware out, then the sound is slowly getting worse as you use it

[@marcusm5127]

So does your lights in your house but you don't notice it.

[@machintelligence]

What you are saying is probably true for triodes, but what about using beam power tubes (pentodes) for greater output efficiency. Power triodes exist, but who except fanatics want them? So tubes in the pre-amp stages are great, but go with transistors after that.

[@ford1546]

The perfect amplifier is when the sound that comes in is similar to the sound that comes out of an amplifier. The sound should not be colored. Comparing with earphones, the audio output of a CD player should be equal to the sound out of the speaker output of an amplifier.

[@paulwbranner6609]

Tubes are actually a passport to Heaven!

[@ericeastman2427]

All tube everything is heaven lol

[@airgead5391]

I guess you use with tubes a LTP config with BJT or FET currensource at the bottom in a feedback topology? Or open-loop?

[@mrspock9514]

So then VTL is wrong for using tubes in both pre and amplification sections ?

[@genez429]

No.... no more than a chef adding a spice to a sauce that another does not. Its a matter of taste. And, as far as accuracy? No audio equipment is 100% accurate as being the absolute sound of what was recorded. Just change a power cord and see how absolute its sound really is.

[@00yourstruly00]

I saw paper put inside the open pre-amp that cause huge ESD concerns, especially MOSFETs are highly ESD sensitive devices.

[@mrpositronia]

Paul, where is the chicken award for this? You really got those cluckers clucking with this one.

[@PastafarianLemur]

Paul: I've been wondering about a certain combination "Tube DAC" and solid state amplifier known as the Aune T1. It is said that the vacuum tube is part of a buffer leading out from the DAC into the amp. Is this a good application for a tube in such a case? Is it in essence using the tube as an input into the amp?

[@nabildanial00]

I used to have the T1 SE MK3, and honestly it sucked, at least when compared to my solid-state Audio-gd NFB11.

[@PastafarianLemur]

Thanks for replying. I take it you tube rolled on it to see if the sound improved too? So far the reviews for the Aune seem to be pretty hit or miss. And a lot depends on what tube they put in. Recently I got the all solid-state SMSL M6 because all the tube rolling to hopefully get the right sound seemed like too much effort when I just wanted to hear music on my desktop and I already liked the sound coming from a Centrance Dacport Slim that has a very similar DAC chip as the M6 from AKM.

[@nabildanial00]

I only changed the tube once, and it was to the Gold Lion. I did say it "sucked" but it was not that bad. It's just when I compared to the NFB-11, it's just not as detailed, the imaging is average and I can't really hear the "tube sound". I find these cheap tube hybrids are just a big waste of time, effort and money to get it right, IMO. Hopefully, the upcoming Monolith Liquid Platinum would be better.

[@Laisvall66]

Now I am confused. I run a Leben RS-100 pre amplifier with tubes and a Nord Acoustics Nord One SE Hypex NC500 (Class D) power amp. Don’t ruin it for me, I am quite happy with the sound and powers my Tannoys just great. ;-)

[@taiefmiah]

I know people who have tried the hypex(Pascal too) and have found them to have significant strengths which tubes don't and sound a lot better than most class D. Don't fret, if you don't feel like something is wrong with your gear, or something is missing, Don't convince yourself that there is or that the aspect of sound someone is discussing is important to you.

[@Richard-HiFiMan]

Great video and a marvelous explanation.

[@Craig_Spurlock]

A friend of my Dad gave me a Harmon Kardon Citation 2 tube amp, I love it. I would not say it is better or worse than my Solid State gear, but it sounds great and is damn sure cool! I need to replace the tubes, and the capacitors, but I cannot afford to do it right now. I do have a question for output tubes, which is better, the KT88 or the 6550? It had 6550's when I got it.

[@biketech60]

Not so much "better" , just different flavor like chicken vs turkey .Personal preference issue , same as with different brands of the same tube model .

[@JimijaymesProductions]

Everything has distortion, everything has headroom; opamps, transistors, tubes etc it's all about designing circuits to keep the positives and minimise the negatives. Also this is about the preamp stage when it comes to current amplification (the stuff that makes it loud) tubes can't compete for efficiency.

[@ivorproblem1332]

For me a pre amp or buffer stage made with discrete transistors running class A sound better than Tubes

[@willychen21222]

What about tube preamp + classA amp ?

[@panpan25911]

It's sad to hear that my tubeless psaudio gcd preamp sounds over-edged and unnaturally. :'(

[@punknpunt352]

My Wife and I were sitting on the sofa in the living room the other day. I had Allan Parsons "Sirus" flacs playing through a class D amp in my theater room. She turned to me and said is someone at the door? I listened, No I dont think so. There... what was that she said. Oh, that is the part of the music you never heard before i said with a smile. Its a great feeling to see someone else "Get it"" for the first time.

[@apollorobb]

I'm sure Nixie tubes will effect your resolution lol

[@InsideOfMyOwnMind]

You can count on it🤣

[@glenallan6279]

Tubes are certainly not going to be as "transparent" as a well built transistor, all things at highest quality; and they will degrade, progressively changing the sound (which you brain will normalize to till it is too much). But a bit of analog softening is likely something the human ear would favor in high fidelity sound when used right. As the brits say: "horses for courses", as in, if you want a clinical sound with no artifacts then go for something that adds nothing and it (a good transistor) will do that (arguably), but if you want something that won't cause fatigue and won't hard clip, then a tube is good. I'd probably prefer whatever was being modified in the sound be done at the creative stage, not the playback stage. I want to hear what the artist intended. Even tonal adjustments after the fact are more about balancing a room or compensating for whatever sound the drivers introduce. A tube will change something. but in the end it really is a matter of preference... So there is, as always, no right way.

[@terrywho22]

Paul, just so you know, fingerprint oils burning a hole in the glass is just superstition. I mean, fingerprints are unsightly and you typically don't want to see them on your brand new expensive tubes, but they are not going to cause a premature death.

[@seanmangan2769]

Terrywho is correct. Halogen lamps can be damaged by fingerprints, but not vacuum tubes.

[@mtabernig]

No!! in fact they have increased resolution over BJT transistors.

[@myronhelton4441]

The sorriest tube equipment blows away the best transistor e quipment.

[@hushpuppykl]

Myron Helton ... you gotta be kidding. I got a cheap tube amp, sounds just ok but it can’t blow away my good solid state integrated amp. I do have an expensive tube preamp and I prefer that over solid state. Heck, I run that tube preamp with the solid state integrated as a mere power amp. I won’t use the solid state’s preamp. It’s really absurd to say a sorry tube equipment will blow away the best transistor.

[@stanislavshokurov6532]

If so. Why don’t you use tubes in your DACs output stage?

[@1jhnpennington]

You've been waiting over 3 years for a reply 😢

[@marcosr2]

Hey Paul, what do you think of pc programs or plug-ins that emulate the sound of tubes in windows players? are they reasonable?

[@seagoat651]

Is there a reason why mosfets cant be the size of credit cards wrapped in its own heat sink and plugged into sockets on top of an amplifier.Heat sinks can come in gold,silver or black even.

[@InsideOfMyOwnMind]

Some tube types have had plug in solid state counterparts. Mostly rectifiers as far as I know.

[@Tubetinkerer]

InsideOfMyOwnMind Google for Korg Nutube... really interesting stuff. A real tube in a DIL housing.

[@jhcoverdrive9287]

There is a video where he's talking about comparing input devices when they were prototyping the BHK power amp. I think Paul says he designed the most tube sounding solid state circuit he could that would plug into the tube socket so they could do quick comparison's.

[@QQ-td9id]

If the goal is Hi Fi (fidelity), then why choose to add any color which is not in the original audio signals even that add color/distortion sounds good to some human ears? That coloration is "fixed" given certain tubes applied. Instead you could go DSP route which give you a world of possibility to create any add-on sound color or effect you want to try or like. That shall be the real HIFI and audio art route to go!

[@fatemiali]

For ultimate resolution and transparency and lack of coloration, I also suggest AR REF 6 Pre & AR GS150 power with say, Siltech 770L series cables. All tube gear.

[@silvanotonini9151]

YES

[@xyjames]

Yes, another video on tubes! For people suspicious of them - tubes and or software "plug ins" designed to add distortion & warmth are used ubiquitously in recording music. A lot of your music is already "pre-tubed" lol.

[@peblinks63]

yep

[@Turboy65]

Bandwidth is bandwidth. A 12AX7A can be used well into the Megahertz range. So can a bipolar or FET t ransistor. In an actual real world preamplifier system, a 12AX7A tube is very hard pressed to reach a flat bandwidth of 15 KHz despite that. But many transistor amps are capable of flat audio bandwidth of nearly DC to several hundred kilohertz. NO WAY that tubes can have the resolution of solid state under those circumstances. As for the notion that tubes sound better...yeah, if you like the sound of added harmonic distortion. If that sounds better to you then it sounds better...to you. I do use an Audio Research LS2 line stage with one tube in it. I can't actually hear that it sounds appreciably different compared to my other preamp, which is a 1987 vintage Pioneer Elite C90 preamp. The C90 is very complex with lots of inputs and loop functions and the LS2 is very simple. I'd be hard pressed to tell you which one I'm hearing if you were to swap them around and not tell me which one is actually hooked up.

[@InsideOfMyOwnMind]

The bit about the overly sharpened signal was exactly the case in old crt televisions. They had a "feature" (I'm not even kidding) where they would mess with the scan velocity around the edges of the items in the image to "sharpen it up". It was called scan velocity modulation (SVM) It just served to put halos around everything and it sucked massive donkey testicles.

[@robertkat]

What does it matter if you are wearing hearing aids.

[@beslemeto]

Bloody hell these amps next to you look sick!

[@genez429]

Tubes can be made to sound soft. That does not mean tubes sound soft. The myth about the soft tube sound stems from older design concepts. Tubes can be lightning fast depending on how and where they implemented.

[@FullFledged2010]

First time i'm suspicious about his explanation... Tubes distort the sound right? So how can they be accurate?

[@royferntorp3575]

Tube pre-amps only distort through the gain staging. transistors do the same under similar circumstances.

[@danabunner487]

Common misperception. Tubes do not distort sound unless you put them into a circuit designed to do that.

[@jhcoverdrive9287]

I think its best put as: tubes or transistors will distort...that's why no amplifier has 0% THD. Now, the rest is just my general impressions after a few hours of reading into diy preamp circuit design. THD measurement is another part of the whole misconception. I think generally you see lower measured THD numbers in solid state amplifiers and that's why some people feel they are superior. The problem is, THD doesn't tell you anything about the content of said distortion. If the distortion your circuit is producing is more even harmonics, it will sound warmer and if its producing odd harmonics it will sound harsh and/or brittle...regardless if its solid state or vacuum tube. Either way once you get below a certain threshold, THD is of less importance (either device can get beyond that threshold) and its the content that is probably more informative of how the sound will be colored. Real cheap tube circuits a lot of times produce a lot of even harmonic distortion and thus have an overly warm sound...but that shouldn't be anyone's benchmark for comparing a tube to a solid state device.

[@InsideOfMyOwnMind]

@@jhcoverdrive9287 I have to call that a comparatively fair and balanced explanation. Brings me to some of the early McIntosh solid state preamps. Simply put, they suck IMHO. So did their speakers of that era although they were built like tanks. On the other hand I haven't met a Mac amp that I couldn't be friends with even though they too lie a lot. They just tell false positive stories about the music instead of trash talking it.

[@jhcoverdrive9287]

www.theaudioarchive.com/TAA_Resources_Tubes_versus_Solid_State.htm I'm curious what amplifier you know of that produces 0% THD. There is a reason so much high end gear uses tubes. Take your suspicion and skepticism and apply it to learning about the different designs and their specific pros and cons (The provided link is maybe a 5 minute read that summarizes the very topic thru various studies by IEEE and AES). You'll see that every device or circuit has compromises; There are plenty of designs that thru various compromises can combine them to create a viable amplifier. And for now, they will all distort - regardless. Your audio goals depend on your own perceptions and preferences, at least you can know how to better find the gear that works to achieve them :)

[@2013brzsubaru]

I have a vincent audio sv-236 hybrid integrated this amp sounds as good and sometimes better than my previous much more expensive Sim Audio w5 and matching pre amp.

[@bigboy9693]

I run a Halcro class D amp with a Icon Audio line stage and tube phono stage, I find no loss of resolution or the brittleness that Paul describes, I have run a Krell KSA 100 and a Musical fidelity power amp's and found both of these lacking when compared with the Halcro, I think the Halcro works very well with the tube front end and it is all down tp personal preference and the rest of your system.

[@editorjuno]

Well, multi-thousand $$$, highly-refined Class D products like Halcro's are way different than the more typical chip-based "entry-level Class D designs, e.g. PS Audio's Sprouts -- just as there is a broad spectrum of Class AB products from cheap mass market receivers to pricey high-end amps that weigh a ton and cost a small fortune, there's a tremendous amount of Class D stuff between a $25 Lepai and your Halcro.

[@MacStoker]

name change? i almost got confused lol

[@joeyahoo4493]

Paul is struggling to explain because he's making tube amp too.

[@Tbonyandsteak]

Heard the best thing that can happen to tube, is that some one invents high ohm speaker. Then You can avoid the transformer.

[@Tbonyandsteak]

@Dave Micolichek Well Transformer have very low efficientcy 50% or less. Meaning you get the full output of the tubes.

[@Tbonyandsteak]

@Dave Micolichek WELL I know that. That is why IF some one invents it.

[@Tbonyandsteak]

@Dave Micolichek It is speculative since such speaker is not made. But the dynamic are determent in Watts. That means high voltage times low current. Like Electrostat speakers.

[@Tbonyandsteak]

@Dave Micolichek Tell me what is an electrostat speaker? High voltage, high impedance speaker. As far as I know it works very well.

[@Tbonyandsteak]

@Dave Micolichek Yeah someone failed.

[@genez429]

Tubes work best in preamps. Its the transformers on tube amps that cause a loss of resolution. I have also heard a tube preamp that was soft. But that was a design choice. On the other hand, tube amps normally require output transformers. My tube preamp is a hybrid, and it has just enough "niceness" to make you smile.

[@Scottlp2]

If a class D amp is your reference....

[@MFKR696]

The great thing about Class D's ability to reproduce the source material with such fidelity is that if you have a piece of equipment that runs tubes, the receiver and power-amp will not "detube-ify" the sound. If you want the sound of tubes, what I've come across in my travels is an old Yamaha tube preamp/compressor. It adds all of the tube magic, while still allowing all of the solid-state/digital equipment in my setup to breathe, so long as the compressor is set wide-open. Compression sounds great with certain guitar tones and with drums, but for Hi-Fi... Not so much... But that's okay. I just bypass the compression circuit and Bob's your Auntie.

[@shaun9107]

That super sound stage is not there with Class D , all that compression for font end . I have never had a tube amp , I bet all the atmosphere is there . Should give my speakers a Full Test in sound quality , and my ears too !

[@johnlebeau5471]

I think this whole line of thought dates back to the early days of transistors in the 1960's. The early transistor equipment was terrible. Can you think of any transistor collector gear from the 1960's? We had sunk into the abyss of newest-latest-greatest when a man named William Zane Johnson started a little company called Audio Research in 1970. www.stereophile.com/interviews/894z/index.html He was basically alone until Dr.s Bill Conrad and Lewis Johnson started conrad-johnson in 1977. This was the same time period when every other audio company was vying for the most vanishingly low distortion numbers, usually through more and more negative feedback, and the result was vanishingly low musicality. Yes, the renaissance of tube gear sounded lush and "soft", but look what it was being compared to. The early days of digital was a reboot of the same scenario, hard and edgy equaled better sound. "Perfect sound forever" was the selling point. It is not true now and was not true then. In case you think I am anti-digital, yes I used to be. The modern DACs however are quite good, and mine has tubes. This is not to say that all transistor gear was bad. Nelson Pass was making some stunning equipment with his company, Threshold, beginning in 1974. I always liked Spectral although I thought it's sound was grainy. And, perhaps the best amplifier I have ever heard, the Mark Levinson, John Curl designed, ML-2 came out in 1977. Now that I think about it, the post Audio Research high end transistor gear was really quite good. Did Mr. Johnson start something? Paul's answer is spot on. Tubes can be good or bad, as can transistors, as can hybrids. After all, it's not the wand, it's the magic you work with it.

[@ejonesss]

vacuum tubes or valves for you europeans are not halogen bulbs so fingerprints wont compromise them. you used a nixie tube for the thumbnail although they may work as an amplifier tube if you was building a crude circuit like those who used vfd displays as amplifier tubes

[@KarlHamilton]

I sent in a question weeks ago. Do some of them not get read out or is there a backlog?

[@MacStoker]

whats the question? one of us commenters might be able to answer, ive been helped out loads by random good folk!

[@InsideOfMyOwnMind]

The one word answer is triage. What's your question? I'll try to keep my biased nose out of it....best I can. 😀

[@markdrukenbrod9475]

All depends on the tube, circuit and implementation.

[@kimchee94112]

Explain why tube computers so muching slower than solid states using the same circuit? The difference is the switching speed across the junctions. Hence the softness (delay response) with tubes.

[@editorjuno]

Tubes don't reduce resolution -- but output transformers sure do, and tubes require them to drive speakers!

[@biketech60]

Except output transformerless amps , which typically need high impedance, high sensitivity speakers . You are correct about output transformers , even toroidal .

[@ehtcom]

Until you hear a tube amp with good quality low distortion wide bandwidth output transformers.

[@editorjuno]

@@ehtcom -- I'm interested is high fidelity, not pricey retro-tech nostalgia like vacuum tubes and vinyl. Ask any tube amp designer if they wish they could avoid output transformers -- the answer will be "hell yeah!"

[@ehtcom]

@@editorjuno well, my answer is I love them. I get 10hz-100khz within 1db out of my output transformers. See westonacoustics.com

[@editorjuno]

@@ehtcom -- If you're happy, I'm happy. I lived through the tube era and have watched solid-state evolve and surpass that old tech through more than five decades of refinement, to the point where nothing with a tube-based output stage can touch the best "sand." I don't care how much you spend on pricey hand-picked NOS tubes and specialized output transformers, you're never going to touch performance like this: www.audiosciencereview.com/forum/index.php?threads/review-and-measurements-of-benchmark-ahb2-amp.7628/ BTW, the transformers that ruin the DIrectstream DACs are pretty much the best PS Audio could get -- and they still were severely detrimental to what could have been a good -- if insanely overpriced -- product: www.audiosciencereview.com/forum/index.php?threads/review-and-measurements-of-ps-audio-perfectwave-directstream-dac.9100/

[@davidfuller581]

Sure, in the sense that tubes are distinctly nonlinear devices and always introduce some distortion. Otherwise? No. That's nonsense.

[@QQ-td9id]

No argument. By definition, if you distort any signal and make the signal contaminated and lost some "information", that is reducing resolution! Check any book of signal processing (digital or analog).

[@ped-away-g1396]

tubes add some coloration to the signal so they sound warmer sweeter and produce even-harmonic distortion which sounds better than odd-harmonic distortion solid-state components produce. but if you're a hi-fi enthusiast (i mean real hi-fi like a signal-source-straight-to-the-amp hi-fi, not some snake oil bs hi-fi) solid-state is the way to go.

[@dirtharris]

🙄

[@Bartmanblues]

Tubes belong in guitar amps.

[@christophschuermann6512]

Tubes are far away to a perfect linear in to out transmission of the original soundquality. They often sound "bigger than live" but when it comes to a longer listening experience, I dont like any coloration of the original soundquality. Tubes are great for guitars etc. but highend means to me: absolute high performance.

[@xstensl8823]

Vacuum tubes reveal inner detail of notes and transistors are better at out lining notes. both high light different aspects of the signal. think attack vs. decay on a piano note, or a note struck by say Neil Young on the Guitar.

[@michaelmouton53]

You do realize that the tubes in the thumbnail are Nixie tubes, right?

[@brettdbass]

I just saw this video in my suggestions listing and thought the same. How interesting that snake-oil salesman Paul hasn't commented...