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Old 23rd September 2003, 07:39 PM   #11
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Hi Joe Ling,

In general it is better to feed the filaments by a voltage, they are usually made for it. Exempt tubes that are made for series powering like P-tubes and U-tubes.

Here is a thread where a B+ delay is already discussed extensively:

Question about 555 timer circuit with relays

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Old 23rd September 2003, 11:38 PM   #12
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