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[email protected]

wrote:

If you are really only losing the filament and it is out completely, it
is a simple matter to trace the filament pulses from the flyback,
through the current limiting resistor, to the crt socket. You really
need an o'scope as most meters do not accurately read the 15KHz pulses
off the flyback to show the voltage.

I've always found a multimeter fine. Yes it reads a bit wrong cos of
the waveshape, but you only need to know roughly whats there to see if
its ok or not.

NT