Quote:
Originally Posted by dieseljeep
Another JA5. Non-AVC, single tuned second IF, hot chassis, little gem. The speaker trademark shows it's made by Ida Densen. It seems like late 50's, early 60's. The tuning gang and possibly, the volume control are isolated from the chassis. Also the screws holding the back, have the plastic caps on them, for some measure of isolation.
BTW, the AC cord insulation is cracked, where it enters the strain relief. If the cord isn't too dried out, you'll have to reconnect it.
Going back to the basics.
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They definitely went to the trouble of isolating the chassis. The plastic coated screws that you mentioned. And on the bottom the chassis is fastened with metal screws that are sunk down pretty deep into a couple of rubber feet looking pieces.
Good eye about that insulation. I'd noticed that and after carefully running the radio up on a variac to see what it would do (all I got was 60 cycle hum) I then cut the cord off at that point.... just to avoid any 'accident' in the future.
Quote:
Originally Posted by radiotvnut
That same basic chassis was used under a million different brands, in several case styles and colors. They were offered from the late '50's until the mid-'60's and usually cost under $10 when new. I recently fixed one for a friend that used disc capacitors except for the "across the line" AC capacitor; which, was a paper capacitor and had blown apart. Before using this radio, I'd strongly suggest replacing that capacitor with a modern AC safety (X or Y) capacitor.
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Thanks for the input and that generates a question on my part. I've seen mention of a 'safety' capacitor for this and other pieces of equipment. How do I find such a capacitor, or determine if capacitors I have laying around are of the 'safety' type. I'm assuming 'safety' means that in a failure mode they'll fail OPEN instead of shorting out? Is that correct?