One of my amps is an original revision-C, made in USA, Blues Junior. I like it because it's tube, very portable, and good for small club gigs. I've been really craving a different sound from it lately. The amp can be a bit boxy. It sort of sounds like a small, Fender amp. After the mods, the Blues Junior has a very open, crisp sound without harshness.
First, I changed all the tubes. I swapped the stock 12AX7 tubes with 12AY7, which do not distort as soon. Practically, this means you can turn the amp to a higher volume setting without distortion. I went from breaking up at about 4-5 on the volume, to about 7-9.
Second, I swapped the stock Eminence speaker with an Eminence Cannibus Rex. This is a warm, speaker with a bit more bass/mid response.
Finally, I performed the "Bill M" mods. Well, technically speaking, I had to purchase these from Fromel Electronics because Bill M (go ahead and google "bill m mods" and you'll find his site) never sent me the mod kit! This involved changing a few pieces on the circuit board (soldering required), fixing the horrible stock reverb, and changing the mids so that you can completely dial them out of the mix.
The amp really sounds good. I can't wait to fire it up and especially run a screaming blues solo through it. Here's a quick sample I hastily put together:
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