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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Be sure that when working on your amp, the power supply is unplugged, and the filter capacitors are fully drained. What is that supposed to do?
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. So, on to the tube In case you didn’t know, a 12AX7 is a twin triode, and the tube can be thought of as two separate valves. A handwired Senior with a handwired reverb on top is a nice dream rig. Log in or Sign up.
Posted 14 December – An other thing that can be improved upon is the tone stack. How would I eliminate the PI section? Next on the agenda would be the pre-amp, and gain. For your reference, what I’m mostly using right now: I’ve changed the tubes, checked the heater and plate voltages and verified most all the values of the resistors, and checked most of epipgone caps.
As I’m running them right now, I think I might like just a little bit more clean headroom, but I am running the preamp tube a little hot, and I can make a huge difference by simply rolling back my volume knob on my guitar L. I think I have a uf in C25 for the combo, but a uf or a uf will offer more bass response than the stock 22uf.
Community Forum Software by IP. Funny, in a guitar, ODs are always my first choice, but in an amp, Ms are my first choice. Yes I am checking with a speaker load, signal generator and oscilloscope.
Gibson Brands Forums: Valve senior Mods. – Gibson Brands Forums
They just seem to “feel” better. A value of 2. I tell them young boys all the time “There’s 2 things you really need to be a “bluesman” – Percodan and Whiskey”. I’m just not happy with the tone now even after trying just about every mod out there.
I will try to attach a schematic with some voltages I measured added, but had trouble doing that last time. This eplphone not nearly as difficult or expensive as you might think. Education is what you’re left with after you have forgotten what you have learned.
Epiphone Valve SENIOR
With a dummy load, signal generator and oscilloscope on the output? Hello, I schekatic a Senior valve head, but I dislike the reverb. Are my concerns about using a scope on those high voltages warranted? I would check the amp stage by stage.
The one in your first post is not working. I’ve never tried it the other way. Page 1 of 2 1 2 Last Jump to page: I am finally going to start working on this amp soon. There are wiser heads than mine on here and they may adapt these suggestions to good effect. No, create an account now. Skipping on a bit, my first two suspects for causing oscillation would be a bad tube, and poor arrangement of the leads inside the amp, especially the OT output leads.
I’ll also give him your list and ask for his opinion as well no offense intended. You will not be disappointed. This can be very “boomy” sounding, but the factory Valve Sr.
Epiphone valve Senior reverb | Telecaster Guitar Forum
I like the M series caps, which are currently produced by Cornell Dubilier. Can you repost the schematic? Epiphone Valve Senior problem.
Your name or email address: I was reluctant to probe with the scope around the plate voltages so used a dpiphone set to AC volts. Thread Tools Show Printable Version.
Posted 11 September – I’ve been considering either the Epi Jr. I found this photo from summer namm last year: Anyone an idea for a quick fix? I’d be interested in trying one out. Originally Posted by bigdrums If it’s oscillation then output transformer leads are the suspect – I see you twisted and rerouted them. Dec 31