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Tram D201 ssb hum in receive

klj2497

Active Member
Jan 19, 2017
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There is a hum in ssb receive. i have replaced the four C624 capacitors, the c5 can and c517. Im stumped
 

klj2497,
Just a few quick observations-If you have "been there, done that" please ignore.

If hum is in SSB RX only, I would look strictly at the SSB/RX signal path. Perhaps a diode or tube active in SSB only?

I would assume (never been inside a D201) that power supply rectifiers are the same circuit in AM as well as SSB but if not, a bad rectifier diode in the power supply?

Noise blanker circuit/tube?

If the hum can be "squelched out" it suggests that the noise/hum is in the IF strip of the SSB RX? Could be a weak or "noisy" tube??

Good Luck. I'm a sucker for the old classics!

73
David
 
Thank you, for the replies. i will check the, v500, v501 and v502 tubes. I love the tube sound.
 

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