air king 325B
 

Trying to find a schematic for this old Berns Air King Intercom system. Turn it on I only get a hum. Im sure I have a bad capacitor, but unable to see making on the capacitors.

We're going to need some more information. When researching most anything a model number and chassis number (one or both) are handy. There may be some service information for it.

Tube complement also, and whether it has a power transformer.

The model is a 325B transistors, hand wired, has a power transformer.

Wow, I did not know Air King lasted into the transistor era!

Air King products became CBS Columbia and quit building TV's and radios around 1957.
Berns Air king was a fan manufacturer in, IIRC, Chicago. It might have been made by Talk-A-Phone, or another Chicago firm.

Unable to find any other name on the intercom, say Berns Air King 325B and so far no other markings. If it was made by another firm, wouldnt it have another name on it?

That's one of those deals where you'd have to recognize part numbering schemes.
There's nothing in Sams and I doubt that any concern that is associated with that unit is still in business.

Is there by chance a basic wiring diagram of an old AM/FM radio that was hand wired, with transistors

Germanium or silicon?

How do you tell the difference?

Germanium usually are PNP and run from a positive ground power supply. Opposite for silicon. Earliest solid state were germanium.

If you can get to the leads, measure with a VOM to see which polarity they are. Take some pics and we can make an educated guess.

My VOM is at my Son in Laws, will go over tomorrow and get it, will check the leads and take pictures tomorrow.

Here's some pictures
 

Here's some of the ID's on the transistors. 2N261, 2N649, 5orSK3003, 2N1180, 2N1177.

When I move the capacitor that right next to the power transformer, the hum is reduced.