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Пікірлер
@nikonmikon8915 4 күн бұрын
I barely understand load lines but this is incredible. the amount of tensor thoughts one must maintain while designing an amp is incredible. there are so many inter related concepts and they all have different operating ranges. have you ever examined a dumble ODS schematic (with listed voltages) to determine what his idea was for creating that strange gain behavior? thank you so much for posting this i will be rewatching it many many times as well as the other videos (ellipse for THD etc). Thanks so much!
@alexforero2674 10 күн бұрын
Excelente video gracias por compartir sus conocimientos y experiencias 👏🏽
@alexforero2674 11 күн бұрын
Excelente video gracias por compartir sus conocimientos y experiencias 👏🏽
@Sierraman59 24 күн бұрын
I have two empty cases and it is very difficult to find replacement drivers in Europe...
@sahhaf1234 25 күн бұрын
Thanks a lot..
@sahhaf1234 25 күн бұрын
This series is pure gold...
@barnyardstory Ай бұрын
These videos are really informative. I appreciate the effort you made in doing this. This probably explains why my Twin with it's ultra linear OT, won't break of for anything ha.
@DrAVRECEIVER Ай бұрын
Dear all , I have QSC RMX 2450 in that clip signal activating when signal input , and their is no any short in any components, changed (NE5532p op-amp ) but still same , channel 2 is working fine but channel 1 is having distortion with clip signal activated parallelly, i requesting all to support this issue,,
@kubockferre5532 Ай бұрын
hi,i made a single end audio with 6sl7 and kt66 ,when i measure the clipping on my scope ,i see negative portion of the sinus arrives before positive clipping its not in the same time ,is it normal with this asymetrical conception single ended ! i precise that i make test clipping on the dummy load , thanks
@MarlonChichester Ай бұрын
What happens if you used a 2.5k potentiometer thats recommend for the rmx 850 - 2450 in a rmx 4050 or 5050 ??
@junkyoutube9060 3 ай бұрын
Interesting.... thank you.
@raphysoucy83 3 ай бұрын
I wish I understand the whole thing. This is hardcore math!
@noel3422 3 ай бұрын
Hense no comments
@drstrangelove09 3 ай бұрын
I cannot find a good description of why it is called "long tail." Is it called "long tail" because that path is like a tail and with too resistors instead of one it looks longer?
@atma-sphere 3 ай бұрын
The 3rd harmonic is the only musical odd order, which the ear treats much the same way as H2 in that it tends to be innocuous. FWIW, a properly functioning analog tape machine makes a dominant H3 also, which is why studios often retain them- no-one seems to argue with the 'sound' of tape. If the amplifier design is fully balanced and/or differential, if the operating points are correct then the 3rd will be dominant, and open loop will not seem audible to the ear.
@treperrys 3 ай бұрын
I assume that you are using the term "ultra-linear" meaning that the input signal is limited so as to not drive the tube into it's non-linear regions (near cutoff and near saturation)? Having nothing to do with an ultra-linear output transformer (as developed by David Hafler and Herb Keroes who started Acrosound ) having screen grid taps so that a pentode ( or beam power tube) is operated some where in between pentode and triode? Thank you.
@deepblueharp 3 ай бұрын
Yes.
@treperrys 3 ай бұрын
@@deepblueharp Thank you for the answer and thank you for the video.
@barnyardstory 4 ай бұрын
Great video, thanks for posting this. An additional issue is, you can't be sure what your buying and from who. Your favorite distributor sells you their parts and you assume (hope) they are what they say: JJ, Tun-Sol, EH, etc. But do the supply houses even know what they are buying? Do they care? Tubes are not not cheap anymore, we need to know more detail regarding the origin of the parts we buy. A distributor should be proud to advertise their tube are guaranteed to be made in xyz and can prove it. Fakes are everywhere.
@barnyardstory 4 ай бұрын
Jeez, I call that "squeal" a 60hz hum and I'd would chase a ground problem for days.
@mauricedemel6142 4 ай бұрын
If we apply dc voltage to heaters ? Can we reduce hum ....?
@rogerw4024 5 ай бұрын
Best content on KZbin, you are concise, knowledgeable, make things simple and teach everything very well. Thank you so much for sharing your knowledge, time and efforts!
@JedHelmers 5 ай бұрын
Awesome video! I shows I still have a lot to learn haha. Im new to the world of transformers (and guitar amp building). I'm taking a crack at building a small Vibro-Champ. After it's built and works as expected, I plan to build a replacement output transformer for it... then hopefully a power transformer, all for learning purposes. Where do you get supplies for something like this, and do you know of any readily available resources for amp transformer designs (ie. wire gauge, bobbin dimensions, laminations, ratios, etc.)?
@markgrimm3564 5 ай бұрын
where can i obtain a schmatic and trrret board latout be more willing to pay for it in the process of a 6g2 prenston build this is so addictive love playing harp plat through a VHT for now but i really want to build the premier 8
@pkontopoulos 5 ай бұрын
Excellent and extremely useful educated info into hum of tube amps. A question please. I have a class A SE UL stereo amp I am designing that has a NFB from speaker 16Ω tap to the 12AX7 preamp cathode. I get a light hum that peaks at 100Hz and 150Hz acoustically analysed. If I input 1000Hz I see the envelope of the output modulated possibly by this hum. If I do your nice advice I will probably have two signals added at the cathode of 12AX7 (one is NFB and the other fro R hum resistor). Will that work? I will certainly try but is it possible?
@osamagad4166 5 ай бұрын
Really amazing video thank you so much
@osamagad4166 6 ай бұрын
Where i can download the program please
@Joshua_Stephens 6 ай бұрын
Very Consise. Nice job.
@gitarrizmo 6 ай бұрын
Great playlist. Could you verify that you mean micro Farad even when you use the milli abreviation as in mF? After all you talk about mu as in μ. e.g. 100μF read as 100 mu Farad compared to 100 mF also read as mu Farad although SI-convention in metric is milli Farad for mF and microFarad for μF.
@jimcastillo8950 6 ай бұрын
Hello, I have a Fender Vibrolux Reverb Custom in which I removed the circuit board and replaced it with a eyelet board just like they did back in the day. I didnt have any problem for some time and I started to get a squel at times and buzzing and then disappear. I did notice that it followed from the normal channel to the vibrato channel and then I removed the Phase inverter tube and replaced it with another tube. It was gone. I had a old RCA nos tube in the PI socket. thanks for your video......
@fkitch 6 ай бұрын
Very informative, thank you. Hope you enjoyed Sevilla ;)
@kilcar 6 ай бұрын
Thank you! All of this info and other videos youve done are so valuable. The safety aspects are essential.Being a " newbee" I really appreciate it!
@kilcar 6 ай бұрын
Youll not find any " UL". or other certificates on these Communist Chinese manufactured devices. China does not care. It mimicks, copies snd plagiarizes everything the West or the industrialized East produces. I have the identical variac, and from almost day one outlets fractured, fuses were blowing, and there was substandard quality for such an important device. These items are a clear and present danger to ones health. Thanks for the expose' this will save lives.
@deuce-way1440 7 ай бұрын
I still have hum in my push pull build using this setup, any other tips for dc elevated heaters?
@deepblueharp 6 ай бұрын
I will share some general information because I don't have a photo of you chassis. If you still have hum, the top issue is generally wiring. The wiring must be absolutely neat. If you look at a Fender Deluxe, you will notice all the wires are no longer than required to connect between 2 points. There must be NO EXCESS wire. Excess wire acts like an antenna to pick up noise from the B+ or Heater wires. All the wiring needs to be laid flat against the metal chassis so the chassis can absorb and ground out any interference that is causing the hum. If a wire needs to cross another wire it must cross at a 90 degree angle. Also, do not run any wire along the side of a component (cap, resistor, etc.) Wire must cross over the component at a right angle or not at all. Wiring at a socket or a pot is a challenge because that last inch at the lugs requires running wires in parallel. (UGH), but just 1/8 inch of separation can make the world of difference. Tube amp wiring is challenging.
@kd5yut 7 ай бұрын
thank you so much for your research. very helpful
@LuChen-fw9xc 8 ай бұрын
Thanks this video clearly explained my questions!
@xaz7088 8 ай бұрын
could it be done in a PI to PP output stage?
@dadebeb810 9 ай бұрын
Sir this was confusing me a lot, so there is no simlpe formula, to find wire temprature, unless we get them expermentally, but now we can aproximate all by saying for example,the energy in,I*V, Which is dependent on the resistance of the wire, determines the temprature of the wire, assuming all other things are keept the same for identical wires( nichrome 80 or 60) of different length and diameter( eg 0.9mm and 0.7mm) Thanks you for the best explanation and insights
@deepblueharp 9 ай бұрын
Metal is a sponge that soaks up heat. Therefore the calcs must be done over time to get how much heat is soaked up between each time interval. Wire temp is not a single calculation like converting degrees F to C. The graph I show is required because air "boils" on the surface of very hot wire. As the wire heats, more air boils faster.
@alexsalapan6329 9 ай бұрын
The "BONUS" is kinna cute. 😂😂😂
@mikemoyercell 9 ай бұрын
I stay away from all newly made Russian tubes. The only Russian tubes I’d use are the old Soviet Union made Reflector tubes from back in the day. Otherwise I only use USA made NOS tubes. I also try to get the JAN tubes when available and priced well.
@bigstick5278 9 ай бұрын
Do you have a web link on the steps and part involved? I would like to keep my 65 BF Deluxe Reverb alive.
@dumpsterchicken6287 9 ай бұрын
I have a question. My output tube cathode has the parallel resistor/capacitor, but not the other resistor to the cathode. Can I attach R hum directly to the cathode? Thank you.
@TimpBizkit 9 ай бұрын
If you're boosting 15kHz by 17dB and 10kHz by 15dB then maybe they should have put a tweeter where the Bose logo is. An Eminence APT80 would do nicely. What's particularly worrying is the 14dB boost at 60Hz. It's a good way to get speakers making farting noises as you turn up the volume.
@amazontheonlychoice1928 10 ай бұрын
Good
@pipercherokee8598 11 ай бұрын
Would the same steps apply to trying to diagnose 180Hz hum? Not entirely sure where it is coming from, but it is present with all knobs at minimum and nothing plugged in. The hum then increases with the REVERB knob, even with volume at minimum. Interesting. And, it is present even if the reverb tank and footswitch are disconnected entirely. Thoughts? '65 Princeton Reverb clone. Thank you, your channel is very informative!
@deepblueharp 11 ай бұрын
Please send me an email (see my KZbin channel). I am going to need some more information and maybe a sound clip for analysis.
@tubehead4345 Жыл бұрын
Hi, my phase inverter doesnt have the out of phase signal, both sides has the same wave, could help me? Sorry, but my english is bad.
@deepblueharp Жыл бұрын
Yes, please send me an email (see my KZbin website) and let me know the schematic you are using.
@IamBrian369 Жыл бұрын
Hi James. Thank you for this great lesson on speakers. This is fascinating as I never heard this from any techs. I have all my speakers in parallel. Can I just reverse polarity on 1 of the twin cabinet speakers or 2 of the 4 on my bassman speakers?
@deepblueharp Жыл бұрын
Yes you can. It will be a bit of experimentation on bassman. Reversing 1 the polarity of 1 speaker should be sufficient.
@toddlogan9023 Жыл бұрын
Any suggestions for volume being cut as depth is increased with a preamp bias wiggle
@deepblueharp Жыл бұрын
I would need a schematic. The volume should not be affected. I also need to know what you mean by bias wiggle. That isn't an engineering term.
@kevinbeckenham3872 Жыл бұрын
Thank you for explaining how get rid hum, in my ferrograph series 4 valve reel to reel tape recorder
@mozilla2576 Жыл бұрын
Thanks for the drivethru of the Bassman.
@BluesMan1234 Жыл бұрын
As an electrician/guitarist that has gotten into electronics and amp building, this is an amazing video with lots of interesting information, really well presented. Thank you sir.
@triclone123 Жыл бұрын
I love it. Thank you!