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Old 5th Jul 2020, 2:40 am   #49
bionicmerlin
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Join Date: May 2010
Location: Warminster, Wiltshire, UK.
Posts: 682
Default Re: Marconi 1400 birthday present

Well I have managed to make some improvement. .i have tried fitting a new 1500 EHT tray.the results on 405 are good. . On 625 it’s Better but not quite there.
I was reading an article by John law going along with what Nick was saying with the VDR as a possible problem. Also he said it can fail if C113 goes faulty. (100pf 2KV pulse) not that I have one to hand.
I still have poor contrast on 405 I have checked the pot and changed a couple resistors but no joy. Contrast is very good on 625.
I got a couple pictures . I also replaced R70 as Dazzlevision recommended.
Andy
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