Ultra TWIN Model R786 1953 - UK Vintage Radio Repair and Restoration Discussion Forum

clockman · 18th Jul 2020, 3:00 pm

Hi is there any one in the Hertfordshire area who can test my valves in a working set 1C2 1F3 1FD9 1P11 I know it's a long shot but worth a try?

marconi_pete · 19th Jul 2020, 3:54 pm

Hi,
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.

Thanks,
Peter

clockman · 21st Jul 2020, 12:31 pm

Thanks but now have tested the valves in another set and are all OK.

18th Jul 2020, 3:00 pm	#1
clockman Tetrode Join Date: Jul 2020 Location: Borehamwood, Hertfordshire, UK. Posts: 83	Ultra TWIN Model R786 1953 Hi is there any one in the Hertfordshire area who can test my valves in a working set 1C2 1F3 1FD9 1P11 I know it's a long shot but worth a try?

19th Jul 2020, 3:54 pm	#2
marconi_pete Hexode Join Date: Mar 2012 Location: London, UK. Posts: 317	Re: Ultra TWIN Model R786 1953 Hi, 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. Thanks, Peter __________________ BVWS and BVWTM member

21st Jul 2020, 12:31 pm	#3
clockman Tetrode Join Date: Jul 2020 Location: Borehamwood, Hertfordshire, UK. Posts: 83	Re: Ultra TWIN Model R786 1953 Thanks but now have tested the valves in another set and are all OK.