I’m working on a Epiphone Valve Senior guitar amp that works fine I will try to attach a schematic with some voltages I measured added, but. Looking at the schematic I think you could borrow two 12AX7s from the Valve Sr to use as a preamp tube in the Valve Junior Reverb unit but. Download GIBSON EPIPHONE VALVE JR service manual & repair info for electronics experts.

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Yes, my password is: Posted 15 November – Community Forum Software by IP. Any help will be greatly appreciated. It is oscillating at frequencies above audio. If it’s anything like the VJ tone wise it should kickass.

TROUBLESHOOTING: Epiphone Valve Sr Combo – Ultimate Guitar

Before I address the tube, I would like to look at resistor 3. If I try something once, and it works, i stick with it. I have a second “updated” schematic from Gibson but it has no call outs, r3, c5, etc. Anyone an idea for a quick fix? You will not be disappointed. Then put it back on standby for a few seconds, take it off standby and it comes back to life until the gain reaches a certain level.


This may be an oscillation at some stage and past this stage you get only distored signal.

Epiphone Valve Standard- Please Help? Yes I am checking with a speaker load, signal valfe and oscilloscope. I’d like to see a schematic of the hot rod version to see how epiphone did it. Is that where you meant?

Unless you meant to leave V3 in place I can’t get a signal out with input signal attached to C13 because V3 is removed.

I presume you meant C24? This still allowed the amp to attenuate sharply at a nominal gain, which stays attenuated until I turn off the plate voltage with the standby switch, and turn it back on again. Originally Posted by warplanegrey i take it in the ass.

Epiphone valve Senior reverb

Maybe epiphone will reveal more news at the upcomming Winter Namm No, create an account now. Previous 1 2 3 Next. Then it drops off again. T here is not really one single mod that will bring the amp to life, but a combination of upgrades and “tweaks”.

What happens in this case?


For your reference, what I’m mostly using right now: Login or Sign Up. Originally Posted by Crxsh Jesus loves a tasty muff. I svhematic the 6V6’s so I’ll probably try the Valve Senior when it hits the streets.

I saw a bitmo mod for the Junior to turn it into verb-unit. If you don’t know how to drain the filter caps, you can Google it, or shoot me a PM.

Can you tell me anything epiiphone the 4 resistor array at that location? You see if Enzo says something the rest of us just nod in sage silence, but really it’s what we’re all thinking Alas we still have some confusion about tube numbering. This seems to be everyone’s big issue with this amp including mine.

I’ve changed the tubes, checked the epiphon and plate voltages and verified most all the values of the resistors, and checked most of the caps. Thread Tools Show Printable Version.