Modifying a Traynor YCV40...

[azrael]

Looking at a Traynor YCV40.
http://i131.photobucket.com/albums/p...aynorYCV40.gif
vectorized form - schematic starts at Page 8.
http://www.traynoramps.com/downloads...an/smycv40.pdf

I was thinking about modding mine a bit, just for kicks.
The first tube stage kinda looks like a Vox, in terms of how it's boosting the amp.
What if we changed...
R4 to 68K
R3 to 2.7K
C1 to 680nF

So it looked more like a Marshall?

According to the service manual, the two difference that make the YCV40 and YCV50 take different tubes are R78 and R106. I might try that mod, and try EL34s.

What other mods could be made? I'm mostly looking for a thicker drive, and less noise.

[madkatb]

The YCV40 (6L6's) uses the same power transformer and PCB wiring for the output tubes as the YCV50 (EL34's). So it has enough filament current capability to run a pair of EL34's and is the output tube bases are wired correctly. (Actually, I think they both use the same PCB.) All you need to do to run the EL34s is change the bias. Suddenly you'll have a distortion channel you can use (instead of mush) and still have a nice "chimey" clean channel. I've changed a couple of these by just paralleling the bias resistor (I think it was R78) with a 56K. Neither had adjustable bias (older models).

[big_teee]

The YCV40 (6L6's) uses the same power transformer and PCB wiring for the output tubes as the YCV50 (EL34's). So it has enough filament current capability to run a pair of EL34's and is the output tube bases are wired correctly. (Actually, I think they both use the same PCB.) All you need to do to run the EL34s is change the bias. Suddenly you'll have a distortion channel you can use (instead of mush) and still have a nice "chimey" clean channel. I've changed a couple of these by just paralleling the bias resistor (I think it was R78) with a 56K. Neither had adjustable bias (older models).

Not trying to hijack the thread, but I have a Traynor YCS 50 Combo. My Combo came with the 6L6s. If you ordered the Head, it came with EL34s.
I read a thread on another forum, a long time back,where a guy put KT77s in his, and said it made it sound like a new and better amp.
I don't know if he had to change any resistors or not?
If all I had to do was replace the tubes and rebias, I could do that.
You may want to try the KT77s also, they have the same heater current as the EL34s. 1.5A I think.
The 6l6s run .9A .
Doesn't the YCV40, and YCV50 both have the auto bias circuits?
My YCS-50 has a manual bias circuit.
Later,
Terry

[azrael]

I currently am running KT77s. In fact, I may have been "that guy".

[big_teee]

I currently am running KT77s. In fact, I may have been "that guy".

In which amp?
I was talking about someone that was running the KT77s in a YCS-50 like I have.
Terry

[azrael]

Oh, nm. They're in the YCV40 in question.