I'm repairing an old (circa 1960) console hifi system for my parents. I'm no expert but also not totally incompetent. It originally came from Sears, I do not know the model number, nor the power output of the unit. Attempts to find any schematics online have failed.
However, it's pretty clear to me the problem:
The audio amplifier just produces a very loud hum with the signal mixed in softly below it. Investigating, I find the last large capacitor on the amplifier board is literally blown apart.
Capacitor is about 1.5" tall and 1/4" in diameter. It's made of rolled paper inside. Very much looks like a firecracker that blew apart.
Sadly, the only remaining plastic I can read, I can make out "35v" and the final digit "9" (at the end of what was a longer number). And, it reads open with a meter, so I have no clue what it's original spec was.
Just looking for some procedure for replacing it - best guess, process of elimination, most commonly used rating for radio amps of the era, or other advice.