Thread: Trio 9R-59DS
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Old 11th May 2021, 4:06 pm   #2
Join Date: Jan 2011
Location: Croydon, London, UK.
Posts: 323
Default Re: Trio 9R-59DS

Hello Malcolm,

Assuming this is a fault and not just down to band conditions/aerial, a good place to start would be to check the voltages around the product detector valve (V6). The circuit diagram has them marked as:

Cathode (pin 2) 2.7V
Anode (pin 5) 150V
Screen (pin 6) 64V.

Any that are a long way off would suggest a component fault in that area.

frsimen is offline