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Re: Cold resistances (pretty much confirmed)

I was curious so I made some quick measurements on random samples of 6-6SN7 pulled from my junk box: all used all test good. Not a rigorous meas set up nor were meter accuracy/precision statements consulted:

Tungsol #1 1.54 ohm cold = 4.1A calculated: 0.63A @ 6.3VAC measured
Tungsol #2 1.47 ohm cold = 4.3A calculated: 0.66A @ 6.3VAC
Sylvania #1 1.54 ohm cold = 4.1A calculated: 0.62A @ 6.3VAC
Sylvania #2 1.48 ohm cold = 4.3A calculated: 0.62A @ 6.3VAC
Sovtek #1 - 2.34 ohm cold = 2.7A calculated: 0.66A @ 6.3VAC
Sovtek #2 - 2.35 ohm cold = 2.7A calculated: 0.66A @ 6.3VAC

Interesting how the Sovteks meas about twice the cold resistance of the US brands but they all draw close to the spec 0.6A nominal when hot.


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