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Old 19th Jul 2020, 3:54 pm   #2
marconi_pete's Avatar
Join Date: Mar 2012
Location: London, UK.
Posts: 317
Default Re: Ultra TWIN Model R786 1953

I'm in north London (Angel Islington Area) so may be able to assist if it's not too far for you. Alternatively you can test the valve filaments out of the set with a regular multimeter set to ohms range and hold them against the first and last pins on the valve. (Either side of the larger gap.) if you get a resistance reading then the filaments are OK. No reading would usually imply that the filament is open circuit and therefore dead. If you wanted to do a full emission test then you would need a proper valve tester but the method above should prove the viability of the valve anyway.

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