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Re: Positive temperature coefficient of Tungsten.

Mark,

Thanks for the thoughts and info. With my own technical judegments I completely agree with you.

From datasheet of 6SN7 I see 0.6mA heater current with 6.3V. The resistance at working temperature thus looks to be around 10.5kohm.

However, anyone has the info of heater resistance of this tube (and/or others) at room temperature, right at the moment it is fired up?

Or if I can find out biased heater temperature, and assuming constant temp. coeff. w.r.t. temp, the value can also be calculated from this 4.5 x 10 (-3) K(-1) coeff.

Knowing this will also give me some idea of surge current of a cold heater.

Ehien

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