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Tube has worked for extended testing with a good deflection board. Voltage is 101.0 on one side and 101.6 on the other.
When you are losing the image, do you still have neck glow?
If you're getting 0V on the Q504 side of C505, pull it (or test continuity across it) and make sure it isn't shorted. And/or measure the resistance from that high side of C505 to ground, and make sure it isn't shorted (i.e., it shouldn't have a low resistance).
No neck glow after the picture fades!

You can try the assorted spring box at a hardware store. You may find one that will work.Any suggestions for what can replace the springs for the HV diode in G05-802 and V2000? I opened one up yesterday to find one spring completely carbonized and gone. I tried replacing the spring with one from a pen and I found that it didn't work all that well. I suspect the gauge of the wire used was too small. Is there a spec copper spring that would work?

Any suggestions for what can replace the springs for the HV diode in G05-802 and V2000? I opened one up yesterday to find one spring completely carbonized and gone. I tried replacing the spring with one from a pen and I found that it didn't work all that well. I suspect the gauge of the wire used was too small. Is there a spec copper spring that would work?
Is the +90V on pin 1 on P500 on a G05-802 pushing +90V DC against the chassis ground, when there is no spot killer? I have a deflection board that causes the HV to not do HV. I know the HV cage is good because I've tested it against a good deflection board. I've pulled and tested just about every transistor on the bad deflection board and I'm not finding anything. Fuses are all good, pins have been cleaned, connectors deoxed, and solder reflowed. But I'm getting zero on P500 pin 1. Also replaced D608 and D708 because D608 was suspect, along with the electrolytic caps. Still no joy.
Also I found some really good spring replacements at Ace Hardware in the Hillman nuts & bolts section. They also have selection of fuses that I noticed for the first time.
New board. Other one was a V2000. I was measuring pin 1 with P500 disconnected, so that answers that. I thought it sourced from the deflection board. What are the voltages on the pins going to the HV, from the deflection board? The heater pins are showing 6VAC.
this 2% silver solder is typically 60% , 38% , 2%HV cup on the flyback side. Where can I source the 2% silver solder? Amazon is a confusing mess.
just picked up a rough Battlezone with a G05-802. i wanted to test the monitor in my Asteroids which i know good; Asteroids has a 19V2000 but FAQ says they are plug compatible.
reflowed the pins on the deflection board before i plugged it in.
initial power up: tube makes sound similar almost-boiling water; this seems like a bad sign. external arcing at 400v (grey) wire on neck connector which connects to pin 3 on HV board.
pulled and reseated neck connector; reflowed pins on HV board. cleaned HV diode, boots, and anode cap with isopropyl alcohol and some q-tips.
second power up: tube still makes almost-boiling noise. no more external arcing but now internal arcing in the tube neck.
FAQ doesn't say anything about these problems, but i'm kind of assuming that unfortunately the tube is toast. does that seem likely?