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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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22nd May 2015, 8:49 pm | #1 |
Triode
Join Date: Dec 2014
Location: Enschede, Overijssel, Netherlands
Posts: 24
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Decca 1000 Projection TV. No EHT.
I have a problem with my EHT unit. It oscillates on 960Hz, there is -33V on the grid of the EL38 and there is no high voltage.
Who here can help me in finding the problem? |
26th May 2015, 11:32 pm | #2 |
Heptode
Join Date: Jul 2003
Location: North Walsham, Norfolk, UK.
Posts: 516
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Re: Decca 1000 Projection TV. No EHT.
Hi have you tried a new EL38. I have known these to cause this problem. Is the screen supply to the EL38 present. Next you need to see if you can draw a small spark at the EL38 anode. If yes then the ringing transformer block has problems. Also check the HT is reaching the ringing transformer primary. You can run these up on a bench supply if you have one, to make working on the unit more easy. Danny
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28th May 2015, 12:01 pm | #3 |
Dekatron
Join Date: Aug 2007
Location: W.Butterwick, near Doncaster UK.
Posts: 8,932
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Re: Decca 1000 Projection TV. No EHT.
Believe these are full of EY51's possibly suspect.
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