Meck XB-702 restoration

[old_coot88]

That tube tester's veracity is questionable regarding an HK short in the CRT. If there were a heater-to-cathode short, it would kill the video signal going into the CRT as well as show a heavy hum bar (since the heater is 6 VAC away from ground, thru the 6X5's heater). In a case like this, the TV itself should be the best "tester" of the CRT.

[bandersen]

Originally Posted by old_coot88

That tube tester's veracity is questionable regarding an HK short in the CRT. If there were a heater-to-cathode short, it would kill the video signal going into the CRT as well as show a heavy hum bar (since the heater is 6 VAC away from ground, thru the 6X5's heater). In a case like this, the TV itself should be the best "tester" of the CRT.

You are correct. I had both F2 and K set to pin 2

So back to the drawing board. The tuner filament transformer and filter choke seem likely candidates. I could power the tuner with a separate 6 volt source.