05-24-2026, 06:59 AM
Sorry, Gang. I have been jumping in and out. Please confirm the following:
You DO have an Aux / Bluetooth input and when the issue occurs, there is no issue with volume level when aux / Bluetooth is in use?
The signal attenuates but never dies, true? If so, the oscillator is eliminated.
You have change the 6A8 (multiple times) and 6K7? Have you changed the 6H6 Detector / AVC tube?
When using your transmitter, do you get a nice negative AVC voltage? When the issue occurs, does the AVC voltage change?
It seems that if the lowest frequency band is the broadcast band, The wafer switches may not enter the picture as (I believe, but I could be wrong) that the wafer switch shorts out sections of the coil to change bands.
It could be that the OSC Mix circuit is good and your issue could involve an IF secondary or the detector diode. The diodes are in parallel so if one goes wacky, it may attenuate the other. You could replace with 1N34 or 1N60.
You DO have an Aux / Bluetooth input and when the issue occurs, there is no issue with volume level when aux / Bluetooth is in use?
The signal attenuates but never dies, true? If so, the oscillator is eliminated.
You have change the 6A8 (multiple times) and 6K7? Have you changed the 6H6 Detector / AVC tube?
When using your transmitter, do you get a nice negative AVC voltage? When the issue occurs, does the AVC voltage change?
It seems that if the lowest frequency band is the broadcast band, The wafer switches may not enter the picture as (I believe, but I could be wrong) that the wafer switch shorts out sections of the coil to change bands.
It could be that the OSC Mix circuit is good and your issue could involve an IF secondary or the detector diode. The diodes are in parallel so if one goes wacky, it may attenuate the other. You could replace with 1N34 or 1N60.
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
"Let us begin to do good"- St. Francis
Best Regards,
MrFixr55
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