11-29-2018, 05:13 PM
Hi Terry,
The oscillator coil checked out ok. However, I found out that moving and separating the wires connecting the 6A7 to the oscillator coil, antenna coil, and band switch from each other as much as possible, I was able to eliminate almost all of the distortion and reduce the across-band attenuation considerably. Now the oscillator waveform is pretty clean and the amplitude only drops about 3 dB from 550 KHz to 1600 KHz. I guess there was some stray cross-coupling that was causing the distortion. The factory wiring layout of the stock Model 60 leaves something to be desired. The radio works great now. Thanks.
The oscillator coil checked out ok. However, I found out that moving and separating the wires connecting the 6A7 to the oscillator coil, antenna coil, and band switch from each other as much as possible, I was able to eliminate almost all of the distortion and reduce the across-band attenuation considerably. Now the oscillator waveform is pretty clean and the amplitude only drops about 3 dB from 550 KHz to 1600 KHz. I guess there was some stray cross-coupling that was causing the distortion. The factory wiring layout of the stock Model 60 leaves something to be desired. The radio works great now. Thanks.
