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Thanks for all your help on this. Lots of good brain jigglers.
Filaments light, tube checks OK in my basic tester (doesn't do mutual conductance or those fancy features though), and I've played with the service switch. Cleaned the contacts with DeOxit, cleaned the switch with DeOxit. Wiggled tube in socket. No change. [sigh]. So much for easy things. Strange thing, the service switch in "normal" gives the horizontal line, but in "service" it gives no raster. That doesn't sound right, does it?
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