Trying to save a 576

[Zenwizard]

Got a 576 that was supposed to be in working order but it seems it is no even close. After rebuilding the collector supply, I managed to get sweep again on the tube but the tube is VERY dim The picture shows the tube with the intensity turned all the way up. I have a strong high voltage power supply and it is exactly where it should be. given how faded the graticule lines are I have a suspicion the former owner stored it in the sun and it baked the tube. Is there any way I can safely drive the tube a little harder to try and get some brightness back. I also probed the 225V intensify pulse and it seemed it was stuck high it was not pulsing like it should. Any way to bring this on back or do I have a parts unit?  The odd thing is the tube is uniformly dim it is but burned just not bright.

[andy3055]

Not sure how much of the info you have so, these might be useful:

https://jacmusic.com/Tube-testers/TEK-576/576.pdf

https://jacmusic.com/Tube-testers/TEK-576/Tek-576-index.htm

https://lazyelectrons.wordpress.com/2018/06/12/tektronix-576-curve-tracer-repair-restore/

[Zenwizard]

voltages as measured from the rear CRT pins.

1) -3815 Vdc
2) -3841 Vdc
3) -3840 Vdc
4) -2667 Vdc
5) NC
6) NC
7) 100 Vdc
100 Vdc
9) 100 Vdc
10) 109 Vdc
11) 52 Vdc
12) NC
13) -3814 Vdc
14) - 3814 Vdc


Heater voltage ping 1-14) 5.9Vac

[andy3055]

Check page 65 of the service manual where there is a good explanation of the CRT HV supply.

I do not see the CRT screen voltage on the diagram bu there is a mention of -4kV in the section mentioned above.