2*10 Sixty Five
pleiksnal
I've recently changed quite a few caps in my MM amp. Now when I power it on it looks fine in that the tubes are glowing but the tiny little transformer starts smoking at the back and you can smell burning metal and there is no sound from the guitar. This is the export model so i'm guessing this was the input step-down transformer. Anyway its a bummer, new caps and a blown amp. Does anyone know what could of caused this?
Thanks
Levi
Full Name
Lars Verholt
Music Man Equipment
HD-130 head, 210X cab, 210RH cab, RD-50 110 combo, Sixty-Five 112 combo, RP65-112
Member for
10 years 9 monthsMusic Man Equipment
MM 2-10-65
Member for
10 years 9 months
Full Name
Mike Griffin
Music Man Equipment
MM 112-RD-65
Member for
10 years 9 monthsComponent Failure Analysis
In a 1980's White Paper on Component Failure Analysis at HP, the most common component failure mode was loss of smoke. For a component to work properly, the smoke must not escape.
BTW: Mike and Lars are correct. If you don't have the required skills, take it to a qualified technician. -Mike Griffin
Music Man Equipment
MM 2-10-65
Member for
10 years 9 months
Not a step-down.
Hi Levi,
if your amp has the 12AX7 (ECC83) tube in it, the 'tiny transformer' is a filter choke. An export amp simply has a different power transformer than a US domestic amp (and at times extra fuses inside). I'm not trying to insult you here - but you need to take the amp to a technician who can troubleshoot it. Smoke is never good.
Sincerely,
Lars Verholt