How do I find time delay in a thermistor?

Tweakers' Asylum

Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

Hi everyone and thanks in advance for your help!
I've already checked the archives, and the only reference to this question had a dead link. So, with a 130-140mA current in a 350VDC B+ line, how do I go about selecting a thermistor? What about the 5-10 mA on my 300VDC B+ to my preamp tubes?
If I can delay the onset of full power by 7 seconds or so, everything is fine - though longer is fine too!
Would I be better off using thermistors on the AC lines that heat my rectifier (5U4GB)?
Sorry for all the dumb questions, but I've been searching the internet most of last night looking for the right values - and right now the only option I can find is to buy 3 or 4 of each of abuot 5 different types of inrush limiters and try them all.
By the way, what is the "time constant" on the NTC chart and how do I use it?
Help!
Thanks again,
Morse

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Parts Connexion

Topic - How do I find time delay in a thermistor? - Morse 08:23:34 01/09/03 (4)

That's a complex question ... - Dave I 10:21:47 01/09/03 (3)

Re: That's a complex question ... - Morse 11:58:51 01/09/03 (2)

Re: That's a complex question ... - DJL 12:39:24 01/09/03 (1)

Re: That's a complex question ... - Morse 12:52:19 01/09/03 (0)

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