blues deluxe help

[funkmeblue]

I have a blues deluxe on my bench that oscillates when the reverb is past 7 only on the clean channel. Any ideas? Also, a 22uf 63v cap was found hanging out in the bottom of the chassis. I can't find anywhere where one is missing. I'm guessing it was an "extra part" from the factory, doesn't look to have ever been installed. I understand the 470 ohm 5watt resistors in the relay/reverb power supply can be culprit but the channel switching works fine and it's only on the clean channel. I figured there have been so many of these damn things made that someone here has incountered this very problem. thanks

[paddy]

Hi there,

I recently had the same trouble and replacing C45/C46 fixed the
problem.

Cheers,
Paddy

[funkmeblue]

thanks, so your saying the 22uf 500 volt filter caps. I'll start looking there

[paddy]

Yes that's right. 22uF 500V.

Cheers,
Paddy

[funkmeblue]

ok, so that wasn't it. I'm begining to think that an op amp went microphonic or something. Even with the master volume all the way down you can't turn up the reverb past 7. Any more ideas

[9pins]

Have you swaped out the verb tank yet, they can get weird...

[funkmeblue]

I've thought about that. It seems if it were the tank that it would do it on the dirty channel as well. The only other tank I have is in my '66 deluxe reverb.