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Phil,
Bear in mind that when you add C across the damper to gain width, the cathode current of the HO tube drops (along with HV). You can bump the G2 voltage up a tad to bring the current back up.
But insert a milliameter in the K leg so you can see what's going on.
For a 'quick & dirty' test of the HO tube, shut the set off for 7 seconds or so, and then back on. If the width is slow to come back to where it was, the tube is borderline weak.
Last edited by old_coot88; 03-18-2014 at 04:06 PM.
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