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Post by wvluke on Dec 10, 2023 21:06:36 GMT
This box was working fine a year ago but was getting moved around while I was finishing my basement. Now I get the scan twice and stops. I’m not seeing any glow from the oa2’s. It trips when jumping pin 6 to 14, the battery test does not work, I get no glow with test lamp from pin 1 to 5. That’s as far as I’ve gotten. Not sure where to go from here. I ordered and am waiting new 6x4 and 2 0a2’s.
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Post by jukenorman on Dec 12, 2023 11:06:43 GMT
You've pretty much answered your own question - if there is no glow from the OA2s, then there will be no write-in or read-out voltages.
Norman.
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Post by wvluke on Dec 12, 2023 22:28:04 GMT
I guess my question would be how to test the voltage between the 6x4 and oa2. The 6x4 glow looks good and I tried swapping out some untested tubes I had from when I rebuilt the tcc1 about 10 years ago and nothing changes
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Post by jukenorman on Dec 13, 2023 10:18:38 GMT
You should be getting about 400VDC after the 6X4 which is a rectifier. The OA2s should be splitting about 300VDC for the read-out and write-in voltages. The exact figures will be in the manual, I think they may be 294 and 147 off the top of my head.
Norman
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Post by wvluke on Dec 16, 2023 21:58:33 GMT
Solved!! It was the 3.3 5w resistor between the two 15uf caps. Playing great again!
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Post by jukenorman on Dec 17, 2023 11:34:58 GMT
Pleased to hear that you got it fixed - and just in time for Christmas!
Norman.
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