answering a question at TOMB, I said:
mods I think improved the Pro,Jr. (and I mentioned in the other thread) and how:
a 12AU7 in first position cleaned it up allowing louder volume with minimal breakup until fully Spinal Tap’d
a better speaker, same thing (I use the amp as a pedal platform) – those two changes were pretty significant
mine is a fairly early (early 80’s, tweed) one, but I know I had a mounting screw that was 1/8 to 1/4″ too long and I hadda swap it it out – I think it was pushing on the wiring
I also hadda replace the handle what eventually snapped – there are good leather ones look like the original are avail at like US$10
I also put those rubber non-vibrate rings on the tubes, but notice no difference other than they might help break a fall if ya drop ’em when swapping ’em out
and I know I eventually got annoyed with the tube retainer spring-things, and just removed ’em completely with no issues
I will note that I had some issues, for whatever reason, with tube tines corroding; after using a emery board on ’em over the years the issue seems to be resolved, altho’ I still do that before recording it
it really sounds rhythm-sweet with weaker gain single coils and goldfoils – it’s possible to get some nice chime that way
it sounds way cool with humbuckers into a (or stacked) cranked dirt pedals for lead – sometimes I look over to see if the amp is itself moving
a loud boosting pedal seems to really increase the dynamics (especially with the 12AU7) and total volume level
after alla that, I agree with Nick’s point – other than tube and speaker swaps, I seldom do anything to amps other than clean and repair them – it’s a good idear on combos to tighten the screws once in a while, and remove the spiders and roaches from inside the box (I am not referring to living roaches, mind you
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vlayman 