Marvel 35 tube amp

[Lazarus Long]

I picked up a Marvel 35 amp today. It appears to be all original. Cosmetically it is pretty rough, but if it actually works, ill build a new cabinet for it.. What should I do to test this thing before I plug it in and blow something up?

 

[Binkman]

did you get an answer? or did you blow something? (or dead?) dealing with high v's on most tubes.

 

[Lazarus Long]

Nope... Its still just sitting there, taunting me.

 

[dr*audio]

Do not turn it on. This thing is really old and the coupling caps going to the grids of the output tubes must be replaced. I would also test the power supply caps for leakage with a cap tester that can apply full power supply voltage to them.

 

[Lazarus Long]

Photo of the guts.. 3 of the yellow capacitors are 600 wvdc, one is 200... The blue one is marked, Mallory .033 600 vdc

Easy enough to replace those.. But, what do i replace them with?

 

[nj pheonix]

Not too much to that. I suspect it wont put up much of a fight.

 

[Lazarus Long]

Not too much to that. I suspect it wont put up much of a fight.

Yeah, its pretty damn simple. Another pic..

 

[dr*audio]

Go to Digikey.com. Search for polyester capacitor. Limit the search to "in stock." Then look at the drop down boxes and select "through hole" and "Axial"
After that you can pick the capacitance first, then the voltage. Same capacitance, same or greater voltage. Any polyester film cap will be fine. Buy the cheapest ones. Epcos makes good ones that are cheap, as does Panasonic.

 

[JohnMac]

Cool amp. Is the cabinet really that bad? It would be nice to keep it original if possible.

 

[Lazarus Long]

Yes the cabinet is that bad.