hi, i got myself an old amp combo with 2x 6BM8 amp 1x 12AX7. it says "made in italy" and according to its looks and the dates on the caps, its from the mid-seventies. it has two input jacks and controls for vol, bass, treble, tremolo speed, tremolo intensity. does anybody have an amp with a comparable setup (from other makes)? is it common for this tube setup to get quite hot? as i understand, the tremolo is driven by one of the 6BM8 tubes (at least it flickers to the speed of the tremolo). if so, is there just one 6BM8 used as a power tube? how many watts does this produce? however, it sounds really great but its also very "fragile". recently it started to add crackling noises to the otherwise cool sound. the bad noises seem to increase with higher volume and tremolo intensity. maybe caused by vibration - they also appear when you knock on the amp. is anybody familiar with that problem? thanks.