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Old 4th Jun 2010, 11:08 pm   #16
Steve_P
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Join Date: Sep 2003
Location: Bolton, Greater Manchester, UK.
Posts: 6,644
Default Re: Vidor CN429 'Lady Margaret' fell silent

Where can it be found? There should be two places - one linked to the HT line directly, one linked to the HT line through the Output Transformer primary. These will be on different pins.

The primary of the Output Transformer should be about 420 Ohms. Is it?

(If it does not read at all, look closely at the pins, as I have had a pin come disconnected here in the past. Solder them up and try again. If this is faulty then you won't get any output.)

The capacitor that Sideband refers to is C17. You can get the circuit at the top if you need it, but it goes between the Anode of V3 and the Control Grid of V4. Worth swapping!

It could be a heater. The heater is between pins 1 and 7 of the valve base, and you can check it with an AVO but only if it puts out a maximum of 1.5 Volts. You only need to look at these valves funny and they die....

Cheers,

Steve P.
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