Quote:
Originally Posted by pac.attack76
Not sure of setting on meter but I moved red lead to other port and I'm getting readings up to .46 or .50. plate in tube starts to glow so I shut down.
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That's a half amp of plate current - too much.
Horiz output tubes are pretty forgiving but don't run it under load until you figure out why it's red plating - it's either too little drive or too much load.
Leave the cathode fuse open and scope the horiz drive signal to the tube. Without the horiz cathode connected the waveform will be more of a square wave but the amplitude and frequency will be the same.
If there's no horiz drive, that's your problem. If you do have horiz drive, you have a load issue, and that can be a problem with the flyback, damper, yoke, etc.
John
05-30-2024, 01:50 PM
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