[Drake] TR-4C

[GGLL]

    1) could be an intermittent parasitic oscillation, check 6JB6 
neutralization or even an oscillation at IF channel. Verify grid 
coupling capacitor for DC leaks and negative bias supply stability.
    2) maybe your VFO linearity is not the best, but read the manual for 
the related specs (dial accuracy within calibrator's range, etc.)

Good luck
Guillermo - LU8EYW.

k7mks escribi�:

>Two problems with a TR-4C that I'm repairing.  (1) Intermittent noise bursts which sound like 80 or 40 QRN.  Reads S-1 to -2.  Noise is being generated before S-meter circuit and AFG.  Antenna disconncected.  (2)  With VFO zero'd w/ calibrator at "0" on dial, it reads 3-4 Kc high at "500" on the dial.  Crystal calibrator is right on 100.00 Kc.  Comments gratefully accepted.  Thanks, Joe k7mks
>
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