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Need help fixing my MM Sixty Five

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JT (javissn)
Username: javissn

Registered: 10-2008
Posted on Monday, October 06, 2008 - 07:56 am:   

I took my music man to a gig and the fuse blew right when i turned it on. After I replaced it and tried playing it again all it makes is a loud hum. As of now, I'm pretty amateur at repairs but i've managed to teach myself a lot and rather learn to do stuff myself instead of relying and spending money on someone else.
JT (javissn)
Username: javissn

Registered: 10-2008
Posted on Monday, October 06, 2008 - 08:37 am:   

by the way this is the 210 65 head
JT (javissn)
Username: javissn

Registered: 10-2008
Posted on Monday, October 06, 2008 - 08:42 am:   

sorry for the 3rd post, but i just tried to turn it on again and it will have a loud hum for about 20 seconds and then just shut off all together. any recommendations?
Mike Kaus (mm210)
Username: mm210

Registered: 05-2006
Posted on Tuesday, October 07, 2008 - 04:10 am:   

YUP-sounds like a trip to the doctor. Could be as simple as a cap gone t!ts up or a transformer took a dump. OR a bad tube. When it blows the fuse, does one tube light up real bright or arc?
JT (javissn)
Username: javissn

Registered: 10-2008
Posted on Tuesday, October 07, 2008 - 09:54 am:   

No both tubes work perfect until the whole thing goes off. I just replaced them a couple of months ago.
Mike Kaus (mm210)
Username: mm210

Registered: 05-2006
Posted on Wednesday, October 08, 2008 - 04:10 am:   

Does it have a 12ax7 PI tube besides the power tubes? Does IT go bright or not show any light at all? It could be toast as well and overdrawing the filament voltage OR the mains. If not, you're going to have to go inside and start normal diagnostics.