Quote:
Originally Posted by Dekatron
Did you use ferrite beads on all wiring for the valve sockets?
Have you tested with a grid stopper resistor?
It could be that the valve under test is oscillating which can result in strange behaviour when measured, it can even affect the tube tester so that it doesn't regulate the voltages correctly and even affect the oscillator used to drive the grid.
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Hi,
No, I'm not using ferrite beads.
Your hypothesis makes sense to me. How can I use a grid stopper resistor? Just in series with the grid connector or should there be a grid leak to ground?
I assume the grid stopper resistor value would be tube-specific. So, how to determine the value for each?