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I would check the screen grid supply and also the suppresor grid circuit to the HO tube...have had some problems in the screen circuit on RCA's. Make sure the screen supply is good before connecting the tube...lack of bias can permanently destroy the tube quickly. You might try a 6.3 volt light bulb wired into the cathode circuit to act as a fuse and indicator. The bulb should glow with a normal full brightness on a properly functioning circuit. If the bulb burns out or is super-bright there is likely still trouble.
Last edited by Chad Hauris; 10-03-2006 at 07:35 PM.
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