[Hallicrafters] Oscillating SX-16

[rrkrr]

Joe,
 From your statements in your note, it sounds like your output audio 
amplifier is oscillating.  Check the tubes for failures, check all the 
capacitors for shorts or low conductivity,  check the resistors for 
proper value, and check the audio output transformer for shorts or 
opens..  Note that the shared cathode resistor for both tubes is mounted 
to the chassis in a metal frame near the tube sockets.

Bob
WB4TGG


carolew wrote:

>I just bought this radio over the 'Net as a working radio. It exhibits a
>high-pitched oscillation squeal and is anything but in working condition. No
>signals come through on any band. Before I raise a stink with the seller, I was
>wondering if anyone had any ideas on simple things to check out.
>
>Here is some more info:
>
>1. The pitch does not diminish if I turn down either the RF gain or AF gain
>controls.
>
>2.  I tried stage isolation by removing tubes to see which tube's removal ended
>the squealing. It continued, however, with the removal of each tube. The only
>way I could stop it was to remove both tubes in the push-pull AF.
>
>3. Most of the tubes are metal. The two glass tubes are shielded and the shields
>are properly grounded.
>
>Joe Connor
>
>
>
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