DIYbanter - View Single Post - Amperex M24-302W equivalent?

frank

wrote:
On Monday, 5 February 2018 12:00:54 UTC, frank wrote:

An h-k short is easily sorted with a transformer. EHT failure wouldn't get
you a white raster. Cathode v normally needs to be raised to cut a tube off,
not lowered.

Yeah, I feel so dumb. I've just figured it out myself hooking a variable power
supply to the cathode. It cuts off at about +20V. So the CRT (thanks heavens)
looks good. It must be some stupid fault on the video path. It has three
stages only, two inverting amplifiers (single bjt each) and one emitter
follower. First stage works, so I'll replace the last two transistors and
check again.
It's been a few years since I was "thinking" about cathode and grids.

Frank