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Old 10-07-2013, 06:32 PM
insurone insurone is offline
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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.
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Old 10-07-2013, 08:12 PM
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marty59 marty59 is offline
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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.
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Old 10-07-2013, 10:14 PM
bob91343 bob91343 is offline
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Tube complement also, and whether it has a power transformer.
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Old 10-09-2013, 06:55 PM
insurone insurone is offline
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The model is a 325B transistors, hand wired, has a power transformer.
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Old 10-09-2013, 07:24 PM
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Wow, I did not know Air King lasted into the transistor era!
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Old 10-09-2013, 08:36 PM
dieseljeep dieseljeep is offline
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Quote:
Originally Posted by Electronic M View Post
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.
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Old 10-10-2013, 07:10 AM
insurone insurone is offline
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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?
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Old 10-10-2013, 10:08 AM
dieseljeep dieseljeep is offline
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Originally Posted by insurone View Post
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.
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Old 10-11-2013, 06:53 PM
insurone insurone is offline
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Is there by chance a basic wiring diagram of an old AM/FM radio that was hand wired, with transistors
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Old 10-11-2013, 10:01 PM
bob91343 bob91343 is offline
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Germanium or silicon?
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Old 10-14-2013, 05:00 PM
insurone insurone is offline
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How do you tell the difference?
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Old 10-14-2013, 07:11 PM
bob91343 bob91343 is offline
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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.
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Old 10-15-2013, 07:59 PM
insurone insurone is offline
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My VOM is at my Son in Laws, will go over tomorrow and get it, will check the leads and take pictures tomorrow.
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Old 10-16-2013, 12:01 PM
insurone insurone is offline
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Here's some pictures
Here's some of the ID's on the transistors. 2N261, 2N649, 5orSK3003, 2N1180, 2N1177.
Attached Images
File Type: jpg 100_0414.jpg (114.0 KB, 13 views)
File Type: jpg 100_0415.jpg (101.8 KB, 9 views)
File Type: jpg 100_0416.jpg (105.4 KB, 10 views)
File Type: jpg 100_0417.jpg (99.6 KB, 6 views)
File Type: jpg 100_0418.jpg (97.2 KB, 11 views)
File Type: jpg 100_0422.jpg (106.3 KB, 7 views)
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Old 10-16-2013, 12:03 PM
insurone insurone is offline
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When I move the capacitor that right next to the power transformer, the hum is reduced.
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