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Old 05-10-2013, 01:44 AM
Eric H's Avatar
Eric H Eric H is offline
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Join Date: Jun 2002
Location: So. Calif
Posts: 11,565
I wanted to take a look at the brightness issue before I went to bed so I studied the schematic from the brightness control to the CRT and I found a cap I overlooked.

I didn't pay much attention to it because it was the Domino style and I was probably thinking it was a Mica, however the schematic showed it to be a .05@600 and most likely just a common paper cap, why they used this one odd style I don't know, maybe it was supposed to be better quality.

It's cap# 58 on the Sams, between the 6V6 Video Output and the 6AL5 DC Restoration tube, from there it goes to the Grid of the CRT.
As soon as I turned it on I could tell it was better, not only does the video and brightness work now but the sync is fixed too.

I tried it with the 5TP4 also but still with only 10kv on the Anode, the tube works but I can't get any focus with so little HV.
Attached Images
File Type: jpg 5axp4withpicture.jpg (26.6 KB, 26 views)
File Type: jpg 5tp4withpicture.jpg (13.0 KB, 16 views)
File Type: jpg badcap.jpg (8.4 KB, 20 views)
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