I’m not entirely sure how to determine the exact model but I can supply the following;
It is a 100 watt hi-gain dual reverb
Chassis end sticker says 4001 U
Preamp board says 94 1-0
Speaker Jack board says A.I
It should be noted the unit came to me with EL34s that tested approximately...
Sirs;
I have on my bench a GCM 900 that is blowing fuses immediately on power up. I removed all the tubes and it still does it. The standby switch position makes no difference. I’m feeling this is a transformer issue, but there are no telltail Signs such as discolored windings or evidence of...