Vacuum Tubes Pre-Amplifier PCB | How Vacuum Tubes Work?

[@ELECTRONOOBS]

Arduino Course LEVEL 2 (Spanish): bit.ly/2ZNWgqy Follow me on FACEBOOK for more: facebook.com/Electronoobs Help me on Patreon: www.patreon.com/ELECTRONOOBS

[@U8uxa8SP]

Do you have the course in English?

[@ELECTRONOOBS]

@@U8uxa8SP Not yet, sorry

[@موجةالبحر-ش7ك]

@@ELECTRONOOBS your voice so nice when you explain something by English

[@VijayaLakshmi19807]

Sir please make a video on RP2040 ic and also on how to make a pi pico yourself.

[@rinokentie8653]

Nice to see a tube project. I started building tube amps 50 years ago as all I could get were obsolete tube radios for parts. I studied electronics at university and have moved on the transistors, microcontrollers etc, but still build high end tube amps because of the fantastic audio quality. Your preamp is distorting the sound, which is useful for a guitar amp, but not for audio.... It would be interesting to see you build a stereo tube amp with one double triode (e.g. ECC82) as a pre stage and two power pentodes (e.g. EL84) as end stage. Very simple, but a good design will provide a wonderful 2x4 Watts, which is plenty for just listening to music.

[@SP-kd6iv]

How to contact you?

[@ajaikumars6948]

Audio projects are the best. Designed as we need🔊

[@nathanwatrous1519]

This is what I have noticed with tube vs solid state. A 50 watt tube amp has way more punch and clarity than a 50 watt solid state amp. Also if you turn a solid state amp all the the way up it will start to distort at some point. The ic/transistor will get saturated with heat faster than the heat sink can remove it, maybe what you might call heat inertia. As for a vacuum tube based amp this phenomenon does not occur. As a matter of fact tubes need heat to function. When reaching a point of peak power you can listen all day long, no distortion. When the amp hits the point of distortion/saturation, it is alot softer on the ears. Electric Guitarist love this type distortion or overdrive. Good video man. Keep up the good work.

[@kennmossman8701]

Any amp will distort but tubes distort with even harmonics whereas transistors distort with odd harmonics which are unpleasant to the ear. So don't overdrive

[@kennmossman8701]

I doubt it is fair to make such sweeping generalizations. For transistors you have class A, B, AB, and D. Then there are different approaches in feedback. Then there are different driver configurations, etc

[@kennmossman8701]

Since the path from mic to media is packed with transistors saying transistors sound bad it like saying you don't like sugar in your cereal while eating Frosted Flakes

[@kennmossman8701]

I believe that heat inertia is called thermal lag. Since hFE varies by Tj it might appear a factor but this doesn't apply to class A and minimally in class D. Moreover it would indicate poor design as hFE does vary by transistor [and other factors]. Since feedback somewhat depends on hFE it is more likely the sound improves in the situation you gave

[@nathanwatrous1519]

I also don't really know if it's also power supply sag/stress either. I just wanted to say, Man amazing feedback and insight.

[@thehobe2111]

Very nice presentation on how the Tube works. I like your little electrons moving around. That looks like a lot of work to make the dancing electrons.

[@PhG1961]

Yessss !!! I liked it a lot ! What a cool project and an excellent explanation of the working of a tube ! Looking forward to see your next tube project !

[@vivekchauhan7468]

Good to see some old school electronics.

[@dennyfox3139]

Nice project! The description says 6N1 tubes, but they are actually 6J1. There are also some missing pin numbers for the tubes on the schematic. I have quite a bit of experience with tube amplifiers. Most run at much higher plate voltages. Sounded great!

[@ivovass195]

Very nice, audio projects are my favourite. Thanks

[@DanieleCappelletti]

Fantastic project as always!

[@ELECTRONOOBS]

Thank you very much!

[@sarathai2876]

Great video Happy Thanksgiving

[@paulsharpe3794]

Hi there I just wanted to say what a brilliant amp I love the rounded sound from the valves. I can't wait for the power amp and then I will seriously look into billding them

[@JonathanDeWitt1988]

Another very interesting video. I really enjoyed the demonstration of with and without a preamplifier and the vacuum tube explanation. The size difference between a vacuum tube and a fully transistor version of an amplifier as well as their power handling capabilities is a bit startling. Thanks for showing that.

[@johndevires5911]

Another great video and project. I have a very similar setup for my study music system, which I made 5 years ago. I love those tubes.

[@AllboroLCD]

I bought one of these type units pre-stuffed with the NOS GE tubes, sounds really nice in front of a class AB amp! Id really like to get a legit enclosure for mine and a remote 4 way input w/display & volume ctrl. Make it into a nice full feature little line stage.

[@SamuelMitchell1]

Really love this project, can't wait to have a go myself.

[@advaithmahadev2646]

Amazing project,Crystal clear explanation. plz build a streo pre amp

[@TRONMAGNUM2099]

Very nice. I now want to make my own so I can combine it with my home stereo system.

[@vladd9344]

Can you make a tube radio, please? I liked the video a lot!👍👍👍

[@ELECTRONOOBS]

I'm working on it!!!!

[@vladd9344]

@@ELECTRONOOBS Great!🤩

[@AnandKumar-ym9yw]

Nicely explained pentode

[@inventorkr1]

Accept my regards, my dear friend, good work and excellent explanation🌹🌹🌹🌹🌹🌹🌹

[@ЕвгенийГузенко-и3ш]

happy new year 2022!!!

[@leehewitt9559]

Brilliant video !👌👌👌

[@prathameshraikar5428]

Amazing 😍🤩👍as always, hard work......

[@ScienceLab760]

very nice project and good explanation of how works vacuum tubes, maybe in future videos you can make other audio circuits, thanks for share

[@marekaksmu]

Top video, I want this project to be sell as a kit :) just perfect 👌

[@andymuzzo8568]

Awesome project. Could the next board be both vacuum tube pre amp and power amplifier all in one?

[@analogman7793]

You're amazing bro.

[@BIGRIP87]

the solid state one is a class d amp so you can't compare the size with vacuum tube amp., which runs on class a or ab.

[@piotrrutkowski5162]

Would you consider making similar tutorial for large diameter electret microphone please ?

[@U8uxa8SP]

Great project, Thanks.

[@arnavrevankar444]

Awesome project!

[@hicham_ben_omar]

toujour intéressante information, merci beaucoup

[@audiopartes37]

Greetings. Big project! Will I have problems if I use Axial capacitor 1.0uf 50v? Thank you very much for imparting knowledge.👍

[@engchoontan8483]

Normal people use LED-bulbs for desk-lighting, aroma-devices, ... audiophiles have tubes and tube lighting from pre-power combinations as options

[@gino3286]

Hi very interesting project I really think that a tube preamp is a very smart way to make a solid state amp more musical Is it possible to use it as a buffer with no gain voltage but with lower output impedance with different connections ? Usually these circuits have Zout around 5kohm I do not need voltage gain because i am using just a fraction of the power of my amp But i do not know on which pin of the tube to take the signal Thanks a lot gino

[@toqeerahmed3016]

Good work 👍

[@sergclevitz3170]

Nice video, I've build a very similar preamp but the PCB was from a Chinese manufacter, but your should be better because in your PCB design the AC ground is separated from input/output ground. In fact sometimes I can hear some interference in mine

[@ngodblackcheeked5604]

for 6j1..what kind of energy do you use...you use an electric ballast what size is it?

[@skyking6989]

The emissions of electrons act like a switch and/or valve. They were used as a transistor before transistor existed

[@Drxxx]

Great channel

[@ithaajja5724]

Hi, please continue make rc tank with you diy rc transmitter full tutorial .....thanks

[@sfunk6294]

Very cool.! Are you powering the transformer with 120VAC? Label on transformer indicates 230VAC.

[@narrasridhar39]

Love from india❤️

[@fjcchfer]

Disculpa, viendo tu esquemático, tengo duda con el capacitor C13, el que está a la salida de los pines para los calefactores. Es mi idea o en el esquemático aparece invertida su polaridad, ya que estás conectando su terminal positiva a GND. Por cierto, como siempre un excelente trabajo de diseño y divulgación para tus proyectos. Muchas felicidades.

[@JohannSwart_JWS]

Pity about the stupid blue leds on the tubes. If you really have to, orange or red ones look way more appropriate. Nice video anyway. :-) BTW, if you really want to make an impressive video about your planned tube power amp, make a hybrid tube/MOSFET one. That's something a lot of folks will appreciate!

[@vizkoze]

How do you determine the gain of the preamp?

[@jayanidabarera9854]

love your vids

[@ELECTRONOOBS]

Thank you!

[@bluesunflower2007]

Nice project! Are the four transistors for current-limiting? Do they serve any other purposes?

[@bryantforsythe728]

I love it!

[@droidbhai2145]

Can I connect with tower speaker audio in pls tell

[@techgautam422]

I've a plenty number of old vacuum tubes of various types but I don't know what type of tubes are those.

[@rentaspoon219]

This circuit board is already on Amazon, would suck if someone's selling his board already For reference on Amazon UK, board has slight difference design but layout is the same: TOPINCN 6J1 Tube Amplifiers Board Vacuum Electron Tube Valve Preamp Headphone Amp Parts Preamplifier Musical Fidelity DIY Kit Ac12V 0.8A

[@Duutse1]

It has been available for more than two years as a kit from Aliexpress and possibly many other places too.

[@nurbowo]

i followed all the instruction in placing the component as printed in the PCB. put all together and the tubes, connect the power supply and turn on the switch. in almost 30 secong i heard sometihing. poping and i found my elco poping up like a pop corn.what is wrong.. can you explain it to me?

[@stephensu4371]

i like tubes, also i like fets

[@briannowak1077]

with today's digital tv, where clean, low-noise, low-distortion tv signals are required, it would be ideal to have a tube preamplifier for tv antennas enclosed in a metal to provide shielding against outside interference in a case with 75 ohm coax input and output: radio shack had some in the 1960's, but they are needed because tv signals nowadays go to a complex decoding system because of the signal compression. I do not know what specific types of vacuum tubes were made for 40 megahertz to 890 megahertz amplification, nor do I know how to look up the older technology. Do you know how to look that information up? I am aware that vacuum tubes produce very good low harmonic distortion audio sound, so all I would have to do is hook up a 75ohm coax input and 75 ohm output, make sure I use the correct type of tubes, and have the correct capacitor values, because of the much higher frequencies being amplified, 30db gain = 1024 times the signal input, with low impedance input so it would amplify the weak signals cleanly Brian Nowak

[@awdhootkanawade]

Was intro recorded using that preamp ?

[@bobdoritique7347]

Merci!

[@richardhead8264]

_The relative voltages on the various grids is unclear._ _Are there application notes for this and other tubes?_ 🤔

[@sfunk6294]

Ver cool!

[@VandalIO]

What music were you playing ?

[@pistollero]

Is this your original ? Because theres also one similar on aliex...

[@sandyroy225]

Nice

[@engineers682]

Supper

[@kevinbarriger8215]

I've always heard the vacuum tubes are better for harmonics and amplifiers.

[@ananthanarayana5768]

5 pcb 5 usd and is it possible to send it to India and 2 vacuum tube and socket what is the cost

[@BharatMohanty]

My father is among one who prefer vaccum tubes....

[@vivekchauhan7468]

👌

[@Duutse1]

Did you really design this tube amplifier? I have bought the exact same amplifier from Aliexpress two years ago. Did you do it back then or are you copying someone else's design?

[@ELECTRONOOBS]

I've designes the PCB with slightly changes but the base circuit is from Google and it appears on so many places I don't know who made it...

[@amirmahdikakavand4197]

👏👏👏

[@tedanderson5528]

Anyone ever paint the tip (top) of a tube?

[@ricodegallo3060]

👍

[@nareshmehndiratta]

wanted one pc complete with components soldered with vacuum tubes{fully completed }pre amplifier board for COD in NEW DELHI NEW DELHI

[@danielauen7790]

Is that not the same schematic that all those little tube amp kits on aliexpress uses for like $12?. Your pcb layout is pretty much identical, Little bit longer front to back, But damn close.That being said, Your schematic is ALOT Cleaner.

[@ZPapaGeek]

I've built something similar for a guitar amp using similar pre-made pre-amps. Swapping in a 500k-1M input pot to give the higher input impedance a guitar needs. One warning if you make a single power supply from a 12v x-former, bridge rectifier and filter caps. Tapping the pre-amp ac before the rectifier, power amp dc after. In this case the "grounds" on the pre-amp and amp will be at different potentials. So you'll need to connect the pre-amp to amp via a small audio transformer. Otherwise you'll let the magic smoke out somewhere. :) Fortunately, in my case it was in the interconnect wires that fried. For more features, you can add a tone stack between the pre-amp and amp after the x-former. Also since for a guitar you only need one channel of a stereo pre-amp, you can leverage the fact these 6N1 tubes vary highly in quality. With some of them distorting much more than others. But distortion is good for a guitar! So put a clean tube in one channel, a distorting tube in the other and a toggle switch to select which one feeds the power amp!

[@cheri758]

This deisign is copied and sold on aliexpress

[@rajeshtandelu8248]

I want Gerber file

[@taham6757]

betta

[@MiguelDeMarchena]

Vacuum tubes have their own noise and are not perfect, transistors and ICs have their own noise too, acoustics + electronics have only one solution to reduce this problem to a desired level and the process is not simple because imply knowledge of the characteristics of the use of materials and size of the speakers and their housings, the texture and hardiness/ softness of surfaces where the sound bounce and the power output to move the air.(note: perfect sound does not exist.)

[@VaishnavVenugopal]

My vacuum tube fell and broke a week ago. :(

[@RickWeberSR]

This is just a copy of that cheap AliExpress kit. Not sure what the point of recreating it is if you just exactly copy it, right down to the inferior components.

[@pistollero]

The question is who copy who....

[@sammin5764]

🌟🎖🌟🎖🌷

[@tonyvarghese75]

Can you please make driver drowsiness detection system using raspberry pi and usb camera

[@nehalr3351]

Your instagram handle?

[@SheikhN-bible-syndrome]

Wow you're really going to lie and say that you made that circuit diagram at pcbway When anybody that's been on AliExpress knows that that's a $12 preamplifier sold everywhere on AliExpress you didn't design that thing at all

[@ELECTRONOOBS]

Chill bro! I did designed the PCB, it literally has my name on it. ooooohhh, yuou mean that I've "invented the circuit"? Of course not! I never said that, Just seach for 6J1 circuits on Google and is full of them, I've just selected one and tuned it to my taste. But that doesn't mean I haven't made the PCB design, routed the tracks, select good position, selected good components to buy, etc and shared everything with you in case you want to change it or learn more. u welcome!

[@maheshmaheshwari9777]

I am the 12th viewer3

[@Mr.Leeroy]

FFS, LEDs under tubes? Unsubbed.

[@NiHaoMike64]

Just leave them out if you don't want them. I wonder if there might be a measurable effect on performance due to the photoelectric effect.

[@Mr.Leeroy]

@@NiHaoMike64 Even the fact that PCB was designed with this in mind is unbearable.

[@pixelgardendotin]

@@Mr.Leeroy ;D