You said the magic word - Germanium! Odds are these caps have long since died. The transistors back in the 60's were not cheap, and cheap ones were really, really cheap garbage compared to today inexpensive transistors.
Assuming you have a PS that works in the thing, then take a look for burned out parts. I'm guessing there are none, given you have Germanium tranny's in there.
I suggest you replace the transistors with a basic NPN transistor, assuming the germaniums are NPN style. Try a MPSA42, which is a good audio transistor and rated for 500mA and 300Vdc. The bias should be fairly close but may not be close enough. If not, you can play with the bias resistors a bit, the A42's will take less bias.
If you are really ambitious you can just build an OpAmp circuit and stick that in it. A LF356 is a good choice and is fairly benign to its surroundings. You might need a current buffer to get the power you need.
A better option is sticking in a power op amp, such as a UA7307TC. This part is just about made for this application. You can get all these parts at DigiKey.com along with datasheets and app notes.