My new Epiphone Valve Jr. amp head

If you saw my previous post on the Epiphone Valve Junior 5w amp head, you know that I bought it to experiment with some mods and circuit changes. I’ve been looking over the schematic and drawing up some of the mods that I want to try. Here is the initial list of mods I want to make to this little beast.

• Add a tone control
• Reduce preamp gain
• Add a switch for a feedback loop
• Add a triode/pentode switch
• Add a conjunctive filter on the OT
• Add a standby switch

I’m not planning on changing output transformer in the first round of mods, though I have one on hand that would be suitable.

I want to reduce preamp gain because if I need overdrive from the amp, I will use a booster pedal to drive it hard enough to go into saturation

I might also end up changing the values of a few components.

There will be a page on my web site dedicated to the mods and the link will be added to this post when I get it online.

The Epi Jr. is a nice little amp for the dollars and I look forward to turning it into a custom unit drenched in good tone!

Over 1Gb of vacuum tube books for free!

Here is a great collection of over 30 books on vacuum tubes, amplifiers and related electronics, all free just for the download time. It is over 1Gb of tube amp data! A great collection.

These books are old (uh, vintage) and the copyrights have expired and were not renewed, so I feel okay about linking to them especially since the page owner has contact info posted in case any of them are in violation.

http://www.pmillett.com/tecnical_books_online.htm