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Old 13th Jul 2019, 5:53 pm   #28
ms660
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Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
Default Re: Quad FM1 questions

C28....-ve to chassis, +ve to the HT rail that supplies the valves, that's it so far as I can make out on the schematic and in your photo's of chassis bottom side.

Lawrence.
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