Tube Amp Archive

Great answer thanks! When you say "people break the rules all the time", because it provides a better tone or it is to get more power out of the tube? Is there advantages/disadvantages of running the tube at higher impedance than what the equation give? The primary impedance calculated with the equa...

Hi! I have a SE guitar tube amp that I already changed the stock 6L6GC to a KT66. I'm planing to try other kind of tubes to experiment. From my research, I found that primary impedance of OT should be (class A, 400V) (correct me if I'm wrong): 8k for 6V6 4k for 6L6, kt66 3k for 6550, KT88 (that's wh...

Error. I hate thoses phones...

Thanks for the comments. I have to say that it is appreciated. I first show and explained all that to my wife and when i was done she said: what do we eat for dinner? I said to myself i better go to ampgarage. .. I took me a while to figure the relay setup. With scotchy diodes and 4000uF i get 8.15v...

Finally, after asking tons of questions, sometimes really stupid one, I finished my project of modifying my Fender Ramparte. I must say first that this forum (you guys!) need a lot of credit in my success. It is not necessary the very good answers to my very bad questions that I had, but more the co...

Thanks you for the reply! Correct me if i'm wrong: It could work if input swings 14V, it will needs 28V differential at first stage, and only 28V differential used (on 56V) at the second stage. With a 8ohm speaker, it will be able to push 24.5W and will need a 49VA-40Vrms transformer in order to wor...

Hi,
To test my comprehension of transistor and amplifier classes, I made this schematic.
Would it work? Is there error?

Q1 Phase splitter
(Q2 Q3, AB class) Bridged with (Q4 Q5, AB class)
No gain

Thanks!

Theses caps are pretty technical...
How you guy know all theses things!!
How can I know if I have RF problem?
If I don't have any problem, replacing the diodes with FRED would be like giving clear eyes drop to a fish...

Correct me if I'm wrong: From my reading and from your replys, theses caps are not exactly snubber because snubber would need resistors in parallel to the caps. In the bridge, the diode turn-off creates high frequency that may get into resonance. The cap don't eliminate the frequency, but lower it s...

R.G. wrote:They're there to suppress possible RF ringing caused by the diodes' sudden turn-off characteristics. It's a simplistic kind of snubber. .

Ok thanks, I'll try to read more on snubber...

I'm back again with my Ramparte. I'd like to know what is the purpose of C10, C11, C12, C13? The voltage is 420V, it takes about 80W, the equivalent resistance is 2210R. These cap seems to make a high pass filter of the PT output letting higher fequency bypass the rectifier. From:http://sim.okawa-de...

And what about using opa541 as unity gain?

Thanks a lot for your explanations! Greatly appreciated!! You ll understand that my main goal of trying new stuff is to lurn from you or from my errors. If my goal was only to get a usefull and efficient device i ll buy something already done. It would make me save money and a LOT of time... I may a...

If i add a couplig cap to the speaker and add a transformer woud it work?

If i add a couplig cap to the speaker and add a transformer woud it work?