Quote:
Originally Posted by ohohyodafarted
...Normally if a crt is gassy, the filaments will be very dim with 6.3 volts applied. And if you increase the voltage while under test on a tube tester the filaments will usually burn out.
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If the tube has gone completely to air, another symptom is quickly apparent:
the cathode end of the neck gets really really hot, immediately. Like too hot to touch. And the heaters may not light visibly, because of being
immersed in a heat-conducting fluid (air). And the heaters pull 'waay too much current since they can't come up to full temperature.
If you put a tester on it, the transformer in the tester may be unable to supply that much current.