Traynor yvm-1 voice master acting funny - - -

[Tyler_Shoemaker]

I'm trying to revive an old voice master currently, and I thought it would be fine but when I went to power it up (after buying all new tubes) I got no signal. Everything powers up - - - the tubes, lights, everything is wired properly, but nothing.

I have her going into a Peavey 5150 4 x 12 cabinet rated at 16 OHM. I've tried the 16ohm, 8ohm, and 4ohm positions - nothing. I looked inside, I found a resister cap that looks a little brown, you think this is the culprit? I can get a photo if it helps. Thanks any help would be great !

-Tyler

[txstrat]

Hey Tyler, welcome to the forum.
Have you ever worked inside a tube amp? When everything you could do from the outside of the amp doesn't bring her to life, you gotta get inside and that's not a piece of cake. Tube amps contain LETHAL voltages even when they are unplugged and sit there for a long time. If you're not used to working inside a tube amp you better bring it to a qualified tech.

I'd first determine if the culprit is in the preamp or power stage. I'd clip a signal to the PI grid and see if it was amplified. If not, I'd clip the output of the preamp to a working power amp and see if that works.

[Enzo]

Amen. We welcome you here Tyler, but we also want you to be here more than a day. AS tx said, the voltages in a tube amp can KILL YOU. it is really important to work safely, and knowing what you are touching is part of that.

The very first thing I would be checking is the voltages in the circuits. Can you use a volt meter? Do you have one?

Some resistors get brown because they spend their lives hot. Others are indeed damaged. it depends on what it is and where it is used.

[Tyler_Shoemaker]

Oh I know. . . I didn't touch anything, I just took a peak. I got a heavy zapp from the 5150 head that belongs to that cab a while back when I was younger, so I know to be careful these days. I was hoping I'd have it figured it before bringing it to a tech to save him time and thus me money. I really don't want to spend too much on fixing it, but it looks like a very simple fix whatever it is (judging by how simple the electronics are wired inside, and the fact that everything comes to life). . . . Now I'm thinking while I'm there, maybe I'll have him mod it for me too, into a '69 plexi - I've heard great things about these suckers turning around into great sounding plexi's, among other models. (Am I right since it has 4 inputs you can have each input rigged up as a different schematic, thus an entirely different amp PER input - that'd be awesome).

Thanx for the safety warning.