Repairs - Peavey Windsor Studio

[Shrek]

Hello All.

I am new to the Forum and New to Amplifier Modding and Repair work.  I do have some experience in modding and guitar work.

I have a Peavey Windsor Studio that I got a few months ago and have been playing through to see how it sounds.  Part of the Marketing hype when this amp came out was that it was Self-Biasing allowing you to put several different types of powertubes in this.  I don’t really know how that works or how that’s ok.  I’m Also not so sure if I like the the Attenuator I have to read how I should use it. 

Anyways

I put a 6l6GCMSTR in to break in and see how that goes.  Seems okay. 
I turned the Amp on and let it warm up.  I plugged in a Digital Delay pedal that I haven’t used before that I got from someone.  I rolled the volume up to about 2 and the attenuator MIGHT have been sitting at 25% 50% I don’t mess with it much.  I was going through the Delay settings and when I twisted the feedback up slowly to 10 the volume slowly started fading.  I thought what the heck is going on with this guitar pedal.  Then when the volume finally zeroed out a Capacitor blew, made a pop and smoke.
   
I can just test the Power Tube with a multimeter?
The older EL84 had debris inside it so I had a new 6l6GCMSTR in it.  Is Debris in PowerTube okay?  Because I was going to put the EL84 back in. 
Capacitor is a C7.  100uf 63vdc. 
I can just drain this board completely out and resolder a new one in correct?
It dosen’t look like there is any way to bias this should I go ahead and check the voltages of the other capacitors? 
Check Transformer voltages…
No Fuses look blown unless I am not seeing one. 

[Shrek]

Peavey Windsor Studio - Schematic

hey guys . I was looking through the schematic and didn't see this one. I hope this is helpful for someone like it has been for me.

https://el34world.com/Forum/index.php?action=dlattach;topic=25663.0;attach=81880

[Shrek]

Pictures of The Chassis.

[Shrek]

Picture of C7 Capacitor.

[TitaniumValhalla]

Those IC (Illinois) caps are known not to hold up well and in that amp are probably 15+ years old now, so they are probably all about ready to blow the magic smoke as that one did. If you’re going to replace it (which you must before you power the amp on again), you should replace them all. That yuge green resistor right next to C7 is the bias resistor for your power tube. Inspect it carefully for any burns, issues with the solder joints, etc. and check its resistance with your meter (looks like it should be 400 ohms).

It’s a cathode biased amp so it’s technically “self-biasing” within reason but considering the possible variables between all the tubes the manual says you can put in, you should still check the bias to make sure it’s not melting down.

As far as the power tube goes, I believe you mean EL34 (big octal tubes) rather than EL84 (little 9-pin tubes). They should not have loose debris inside and I would not put that one back in.

[Latole]

  "   I can just test the Power Tube with a multimeter?  "

No and ...yes ; check bias current ; It say a lot.

Follow TV advice ; I often see those cathode ( self bias ) amps are biased too hoot an tube won't last
Don't go over 90% plate dissipation with a new bias resistor

[Shrek]

Hm. Yeah i see.  Thats all good information.