Re: The "Sussex" Homebrew Valve Tester.
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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Martin, Sweden
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