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#1
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Quote:
just a WAG, jr |
#2
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I think you're on the right track. Now that I've modified the screen control circuitry so that the adjustment range of the screen controls is at a little lower voltage, as I go from the lowest screen voltage to about 1/3 the way up, red brightness increases. Beyond about 1/3 up, the red brigthness decreases, and near the top of the range, I think the entire picture (all guns) is defocusing a little. This might be consistent with additional current dragging down the voltage on either the first or second anode, without additional beam current actually making it to the screen (it's hitting elements within the gun).
I don't think I'm seeing a bigger spot size on the red. Picture is pretty sharp overall. Don't know if that's consistent with the idea that the center of the cathode may be worn out, but I'll simply report what I see. Last edited by Tom Albrecht; 05-27-2018 at 11:29 PM. |
#3
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Really looking nice. I think if you took some closeup shots in the dark the images would look spectacular.
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#4
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Nice work!
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Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
#5
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I just had an idea. I improved my 7JP4 with the grid-cathode short remover
of my Sencore. Maybe my 15GP22 arcs are not caused by gas ... I never saw a purple glow. I'm going to try that short remover on every single pair of electrodes in the gun, including ones between different guns (excluding heater-cathode). It can't hurt. I'll first check it with a 2kV supply set to current limit at say 50uA. That should catch gas. |
Audiokarma |
#6
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Sure sounds like it's worth trying. If we can stave off the death of one more 15GP22, that would be very nice. Let us know how it goes!
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