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In Reply to: Cold resistances posted by Mark Kelly on November 21, 2002 at 18:47:39:
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 @ 6.3VACInteresting 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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Follow Ups
- Re: Cold resistances (pretty much confirmed) - Steve O 22:30:35 11/21/02 (9)
- "Sovteks meas about twice the cold resistance of the US brands - JJ Analog 22:42:04 11/21/02 (8)
- Lower Purity W: Good? Bad? Neither? - Steve O 23:08:26 11/21/02 (6)
- Re: Lower Purity W: Good? Bad? Neither? - Ehien 23:15:36 11/21/02 (5)
- Re: Lower Purity W: Good? Bad? Neither? - Steve O 23:29:32 11/21/02 (4)
- Re: Lower Purity W: Good? Bad? Neither? - SBB 05:49:22 11/22/02 (3)
- Inrush limiter - Ehien 10:29:44 11/22/02 (2)
- Re: Inrush limiter - Steve O 11:37:42 11/22/02 (1)
- Re: Inrush limiter - Ehien 13:59:06 11/22/02 (0)
- some more cold resistance - Ehien 23:08:08 11/21/02 (0)