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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Cold resistances posted by Mark Kelly on November 21, 2002 at 18:47:39:
Actually, I did try to measure the surge heater current on my amp that supplies 2 12AX7, 1 12AU7, and 2 6SN7 with 6.3VDC. However a DMM is not fast enough to show the real peak current, I only saw 5A at the peak.Well, by your ratio it's very high. If they all have 7 times higher current at turn on, the total heater current for those 5 tubes is 14.7A! Although I'll guess it lasts for a couple seconds at most (and then gradually backs down to nominal 2.1A).
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Follow Ups
- Re: Cold resistances - Ehien 21:35:09 11/21/02 (1)
- Much less than 2 seconds - Mark Kelly 20:01:47 11/22/02 (0)
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