|
Probably is gassy.
Purple neck glow usually equals doom.
On my B&K 466 tested cutoff is checked by adjusting the cutoff knob for 2 division increase of the needle. If adjusting the knob causes it to shoot past the 2 division mark and there is no setting that yields that fine adjustment then the tube is a dud...That is often accompanied by purple glow in the neck. Gassy tubes usually test quite strong. If you power the CRT with a working chassis there will probably be internal arcing between the gun and the HV, accompanied by the HV system shreaking in distress.
|