I recently had gotten a TSL 100 from a local pawn shop that had probably been there well over a year. It was cheap and figured it was something to work with. I knew right off the bat that the reverb was non functional. I guess I will figure out eventually what that is. I know it needs some new power tubes for sure. The amp is loud but seems like it could be louder as far as it being a 100 watt Marshall. The amp is from 1999 which makes it a pinch over 20 years old. I had only recently learned that the TSL suffers from the bias drift like the early DSL did/does. Does the TSL need the speaker jack ground issue fixed as well? Are the caps for these located on the motherboard? If so, I'm guessing that a revision 20 board will fix quite a few issues. I'm using it with a single 8 ohm cabinet. Also, has anybody done any upgrades on these such as a Classictone transformer or choke? Lots of other amps that I had a choke added to...only helped the sound for sure. Any tube suggestions? A JJ in V1 seemed to help it out. The Gold Lion 12ax7 that was in there sounded awesome in a Mesa but in the Marshall, it just wasn't anything to exciting.