While I had the amp apart, I noticed that the filter caps are 100uf. This explains the stiffness of the amp. 50uf filter caps are on the list of things to try now.
Are you saying 100uf also for the preamps? Way too much IMHO. For the preamp 20-22 uf is sufficient. I don't mind 100uf on the power tube plates and screens but 50uf mostly works.
Green CH vs MetroAmp JTM45- Should not have done this. The DSL Green ch sounded like a transistor radio compared to the JTM45 run clean.
The JTM45 is one of my favorite clean tones - hard to beat.
R
ed Ch vs Silver Jubilee 50/25 watt. I expected this. The Jub completely destroyed the DSL's gain channel. The Jubilee gain channel just sings and is so 3d and dynamic. The Jubilee has not near the hiss and buzz when its not playing a note either. The DSL red Ch is real noisy.
It is long ago that I had a Jubilee (the 50W top). I should have kept it. It sounded really nice and was not as loud as the regular 50W Marshalls are.
Cheers Stephan