10-01-2023, 07:55 PM
Ron
This is why I think first we need to establish that the GND that comes to the Pin1 is good and not some convoluted meandering wire that goes past gosh knows what kind of noise source. Then we can look further at it.
The fact that touching GND near the tube does nothing, but touching GND-ed tube does something tells me there is some bad GND-ing somewhere.
BTW, I would try another tube if possible, after having established that the GND-ing of the pin1 is good,. just to make sure there is no disconnect in the tube itself between the pin and the case. Or at least try to ohm out the pin to the case.
This is why I think first we need to establish that the GND that comes to the Pin1 is good and not some convoluted meandering wire that goes past gosh knows what kind of noise source. Then we can look further at it.
The fact that touching GND near the tube does nothing, but touching GND-ed tube does something tells me there is some bad GND-ing somewhere.
BTW, I would try another tube if possible, after having established that the GND-ing of the pin1 is good,. just to make sure there is no disconnect in the tube itself between the pin and the case. Or at least try to ohm out the pin to the case.
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.
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