Alamo Amp-5 Help

[cjlectronics]

I am working on this amp and all I hear is a faint static through the speaker. When I open it up, everything is ancient, like right out of the 50s. There are two caps soldered across each 6V6 that have bubbled and blackened the outer jacket. I can't read the numbers to know what they are? Also, all of the caps have no values that can be seen.

Does anyone have a schematic for this beautiful box? The artwork that went into the wooden enclosure is gorgeous.

Thanks,
CJ

[Enzo]

Are these caps the old wax covered things? The wax on those accumulated dust and grime and it could get sorta frosted and opaque. Blow a heat gun on them and the wax melts fight off, exposing a nice clear label underneath..

I didn;t see yours at Schematic Heaven, but how close is this one?

http://www.schematicheaven.com/barga..._montclair.pdf

It should be easy enough to draw out your own schematic. You can tell what tubes it uses, and even if you don;t know cap values, you can still draw in a cap. REasonable values should be easy to fill in on a schematic

[cjlectronics]

Thanks for the reply Enzo!

Well the Montclair Schematic is the closest out of all the schematics at Schematic Heaven. The Amp 5 tube line up is 5Y3 - 6V6 - 6V6 - 6SL7 - 12AX7.

I have attached a photo of the inside. I'll try the heat gun thing... thanks for the tip. I scoped one leg of the two bubbled capacitors across the 6V6 tubes and it is very noisy. This noise seems to coincide with the static I hear in the speaker. I have swapped the main multi cap can capacitor and the noise still exists so maybe these caps are the culprit?

CJ

[Enzo]

Oh yeah. heat gun those wax caps and watch the clouds disappear. You are replacing them anyway, so who cares if they get overheated. And when the caps are clear, check all the resistors. Those are ancient, I mean really ancient, and if a 270k winds up at 290 k, I wouldn't much care, but when a 220k sits at 480k or something, might as well change it, eh?