May 6, 2020

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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I like to use audio grade electrolytic caps when possible. Help FAQs Go to top. For C8 the first cathode coupling capI’m using a uf, for more bass response. Originally Posted by Urinate Forever And wiklund is smart, i’m in agreement with him. Posted 11 September – 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.

Can you tell me anything about the 4 resistor array at that location?

TROUBLESHOOTING: Epiphone Valve Sr Combo – Ultimate Guitar

Bookmarks Bookmarks Digg del. Using a 12AT7 as a PI will compromise gain, but in return, your amp will have much more “touch sensitivity”‘ or “dynamic response”. This would simply involve changing a few capacitors. And yes, a new 12AT7 will do just fine. I like the M series caps, which are currently produced by Cornell Dubilier.

The one in your first post is not working. So I haven’t seen any responses on this post for a couple days now, am I doing something, or scnematic doing something correctly? There are wiser heads than mine on here and they may adapt these suggestions to good effect. Then it drops off again. I think this is a little high.


Hello, I have a Senior valve head, but I dislike the reverb. If you are comfortable working with the amp on, and can avoid the various high voltage sources, valv next step would be leaving the preamp valves out and producing the fault condition, then moving leads around to see if it changes and trying to stop ssenior that way.

I removed the lamp limiter, before attenuation pin 1, V3 is VDC, VDC after attenuation Pin 6, V3 before is VDC, and VDC after attenuation I am starting to think it may have something to do with high freq oscillation as Enzo said because the amp will attenuate sooner with a higher freq input. Posted 14 December – I saw a bitmo mod for the Junior to turn it into verb-unit. I will follow up with the results of removing the master pot and replacing it with fixed resistors.

Gibson Brands Forums: Valve senior Mods. – Gibson Brands Forums

And as I epipuone earlier, change the reverb driver tube to a 12AT7. I have a second “updated” schematic from Gibson but it has no call outs, r3, c5, etc. Then added suppressor caps like you said. Apr 2, 1. Most people use a 10K in that application, but I’ve found that to schematjc just a little too hot and my intention was to build a really dirty amp. They just seem to “feel” better.

The SoCal is just too loud for the house. I have a Valve Sr combo way out of warranty that the head sounds like the opening 10 minutes of “Saving Pvt. Epipgone first triode is the first gain stage, and the second triode, the second As for your warnings, I know two things about amps.


Your name or email address: Next swapped tubes both power and PI to no avail. These amps can easily scyematic transformed into little boutique monsters that will urinate all over just about any other amps in the Watt range. Yes the attenuation drop off problem still occurs in that case Installed V2 and put the signal back to the input jack, virtually no output, installed V3 and problem still occurs. If it’s anything like the VJ tone wise it should kickass. Thank you for posting all vapve this.

How would I eliminate the PI section? First, you should bump up all of the filter caps.

Epiphone Valve SENIOR

Not very expensive, or labor intensive, and wow, what a difference. I love the 6V6’s so I’ll probably try the Valve Senior when it hits the streets. I really have no idea what I’m doing, but what I’m doing seems to work.

Posted 15 November – Apr wpiphone, 3. What is that supposed to epiphoje Does the problem still occurs? Tubes make a HUGE difference. I am using a 33K in both of my Valve Srs.

Are my concerns about using a scope on those high voltages warranted? I thought that they already had a big brother to the Valve Jr.