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Old 18th Aug 2010, 1:53 pm   #2
Station X
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Join Date: Jan 2003
Location: Ipswich, Suffolk, IP4, UK.
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Default Re: Trio W-38 servicing process

I would expect this set to have all the valve heaters wired in parallel, so if two valves didn't light up either thay had blown heaters or there is/was a fault in the heater wiring.

I would start by checking the heaters of the non glowing valves for continuity. If this is OK, then suspect a fault in the heater wiring. Either a short circuit or contact with earth would tend to overload the transformer.

I would also carefully check the work you've done and perhaps reform any high voltage electrolytics.
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