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Tube measuring plug

pennylink

Member
Messages
1,863
Does anyone know anything about this 'tube measuring plug'?

I came across it on a french site, so this is my best attempt at translation: "Suitable for EL34 , 6F6 , 6K6 , 6L6 , 6V6 , KT66 , KT88 , KT99 , KT100 , 5881 , 6550 , etc. Plug the measuring plug into a tube socket, plug your tube into it and measure by connecting a multimeter to the two measuring terminals. 10 mV corresponds to 1 mA, precise to within 2%. Made of black bakelite. 33 mm diameter, 50 mm high".

Comments?

 

pdf64

Member
Messages
7,059
I assume that there's a 10 ohm resistor in series with pin 8, the cathode.
It would enable cathode current to be assessed, and so a rough calculation of static plate dissipation to be made (using an assumed plate voltage).
From the added height, I guess that most head amps would have to be taken out of their cabs in order to use it, as there would likley be insufficient clearence for the tube and the adaptor.
It might be useful to a fair number of people.
 

pennylink

Member
Messages
1,863
If I understand correctly it's for biasing the amp, not to check tubes, right? (Sorry, I'm electronically challenged...)
 




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