05-18-2016, 03:42 PM
Yes. We've been pointing to that for awhile. Why don't you:
1. Clean the socket.
2. Make sure the Cathode pin IS grounded reliably.
3. Can you check the tube?
The likely culprit is the Cathode pin. It can explain high voltage at the plate and SG pins. As well as intermittent operation.
When the radio is powered and the tube is in, take a thin awl-like instrument (insulated handle and a thick sturdy needle) and try to move the Cathode pin or establish contact between it and the socket.
If does not help, do the same for other pins.
Be careful, 400VDC is not a pleasant thing to be zapped with though as Edison/Brown proved, safer than the equal value AC.
1. Clean the socket.
2. Make sure the Cathode pin IS grounded reliably.
3. Can you check the tube?
The likely culprit is the Cathode pin. It can explain high voltage at the plate and SG pins. As well as intermittent operation.
When the radio is powered and the tube is in, take a thin awl-like instrument (insulated handle and a thick sturdy needle) and try to move the Cathode pin or establish contact between it and the socket.
If does not help, do the same for other pins.
Be careful, 400VDC is not a pleasant thing to be zapped with though as Edison/Brown proved, safer than the equal value AC.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
