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  #1  
Old 09-13-2018, 12:46 PM
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If the H drive pot can go to zero, then the max value of 34k is not a big deal, as long as the 4700 ohm is the right value.
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Old 09-13-2018, 01:43 PM
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Quote:
Originally Posted by old_tv_nut View Post
If the H drive pot can go to zero, then the max value of 34k is not a big deal, as long as the 4700 ohm is the right value.
Yeah, the Pot can go to zero and I had replaced the 4700 ohm resistor as it had gone bad.
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Old 09-13-2018, 03:09 PM
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Just for the heck of it unplug the HV lead from the CRT and take a reading on the HV lead connector. Just to verify that the CRT isn't somehow loading down your HV.

Last edited by Kevin Kuehn; 09-13-2018 at 03:12 PM.
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Old 09-13-2018, 03:20 PM
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Actually, I've been doing most of the tests without the CRT, I hooked it up last night just to verify that the voltage wasn't high enough. Still couldn't get anything. I've also ordered a few more 6BQ6s just to verify it isn't the tube, though both of the ones I have tested NOS without any shorts. Just curious, what could possibly be loading down the voltage on the screen of the HV output? and what is the plate voltage of the 6BQ6 supposed to be? (Listed as do not measure)
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Old 09-13-2018, 03:30 PM
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Quote:
Originally Posted by Zsuttle View Post
Just curious, what could possibly be loading down the voltage on the screen of the HV output? and what is the plate voltage of the 6BQ6 supposed to be? (Listed as do not measure)
Leakage current to ground internally in the CRT or possibly something interfering with correct bias on the grids.

The plate of HO tube has high voltage spikes that can easily take a meter out. It's generally not recommended to try measuring there.
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Old 09-13-2018, 03:36 PM
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Quote:
Originally Posted by Kevin Kuehn View Post
Leakage current to ground internally in the CRT or possibly something interfering with correct bias on the grids.

The plate of HO tube has high voltage spikes that can easily take a meter out. It's generally not recommended to try measuring there.
I meant using a HV meter to measure it. Either way I'm still not sure why I'm not getting the proper voltage on the screen of the Horizontal output, is there anything I can do to isolate the problem?
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