Compliments once again on your outstanding workmanship sir.
But offhand, it seems a minimalist, low-B+ design chassis trying to drive a large CRT is not going to deliver optimum performance, particularly with only 11KV on the anode (if your HV meter is correct).
Try this for a moment.. short out the resistor feeding G2 (screen grid) of the 25CD6 to raise G2 voltage a bit. See if this improves HV, width and focus at all. If it does, it suggests that a higher B+ supply voltage on the H output/damper circuit would improve performance. If it doesn't, then maybe a smaller CRT would work better with this chassis.
12-22-2016, 11:15 AM
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