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7904 CRT problems

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Posts: 1
Joined: July 3rd, 2021, 11:18 pm
Country: New Zealand

7904 CRT problems

Post by valvehead003 » July 3rd, 2021, 11:41 pm

Hi all. Long time tek scope user but first time poster.
I have a 7904 that I have used for the last 10 years or so and apart from some power supply issues it has been fantastic. I'm hoping that someone here can help with a problem that has developed over a period of a year or so.
At first it started with the power supply taking a few 'bursts' to get going. This got longer and longer but I am sure it's not a psu problem. After a while a hissing noise was audible. Finally it now refuses to get going and there is a strong arc from the anode connector on the crt to the chassis. I have removed the crt and thoroughly cleaned the entire area around the connection and scraped a little of the HV silicone back. I then coated with many layers of Corona dope to try and break the arc. So far nothing has helped. Any advice on how to solve this problem received with thanks.

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