Looks like after a good 10/20 years respectively, it's finally time for me to retube my amps:
Marshall 6100 LM
V1-V7: unbranded, presumably stock
V8-V11: 5881, currently stock Sovtek
++: super quiet
+: smooth and pleasant top end
+: huge amounts of gain
-: Crunch mode A (uses V2A and V6) much...