I have a TSL 60 head I have been going through, got it in a trade---it didn't work, had no output--
Replaced preamp tubes and Power tubes with known good ones---got sound although very low and a slight hum overall
replaced R49 (1k 5w) got fairly good volume--but have to run at 7-8 on master and channel for gig levels
Power seems like a 25 or 30 watt rather than 60
OT and PT are original, have played the amp for maybe 9 hours--7 of which were gig levels and have had no problem, checked bias over and over and it is stable at 79 with no drift on JJEL34L