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Hello from Czech Rep :o) I had the same problem with my MKIIb's reverb (MKIIb 12/20/80) My tech had cleaned reverb springs in a centre of a reverb tank - they were muffled by a heavy dirt of oxidized foam molitan pads there - e.g. mechanical problem ... - 30yrs is 30yrs :o)))...now it's OK...

Hello, about valves - try 6L6GC Winged "C" SED - Russian valves, a matched pair or quad. These valves are very similar to old Sylvania ones (early Marks OEM valves). A lot of harmonics, great dynamics and NATURAL tone. You will be surprised then, how naturally your Mark will react to knobs...

Hello, IMHO, if you need 4x6L6 - the best is a matched quad of Russian Svetlana Winged "SED" - these valves are verrrry similar to Sylvania, "MB company" valves of early Marks years. You'll get full sound with a lot of harmonics, great dynamics and natural colour. Preamp valves are important...