|
I did not see the CRT so cant say for sure if its blooming and killing it or biasing off killing it but since the HV is dropping I have to assume its blooming too much current. I just want to make sure its not opening on the hot side as soon as the wiper moves, going to ground potential, resulting in a full on bias of the CRT.
with the HV somewhat working I would recommend looking into getting the CRT bias checked. a couple meters on the G1 and K should show whats going on. again I prefer analog as its just easier to see. is the K all over the place with the adjustment of the bias pot? this what I think but it would be good to confirm the G1 is holding steady.
Since he had two of the same chassis (silver tone RCA clones) on thing he could try is to monitor the K/G1 voltages off both when switching from normal to service and then see what happens when adjusting the bias and drive pots.
Also see how responsive the G2s are compared to a working chassis. again I really think a good analog meter is much better for this.
|