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Old 29th January 2013, 09:24 PM   #21
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Quote:
Originally Posted by tubelab.com View Post
series string heater circuit

I came across the 20EZ7 when they were about a buck each. No more.

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Old 30th January 2013, 07:59 PM   #22
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You could use a bunch of other tubes -- the temptation would be to put a resistor in the filament supply but the current at turn-on is pretty huge. In the case of a 12AX7 the cold resistance is about 13R.

If you put a DN2540 in the filament line, however, you can limit the turn on current and set a value which is appropriate:

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Old 1st February 2013, 03:39 AM   #23
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Finished:

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