In Reply to: B+ time delay posted by Tube Cadet on March 2, 2003 at 20:41:38:
Best to switch the transformer primary if possible. Use a separate filament transformer for the tubes you need to "preheat", then switch on the B+ transformer after an appropriate delay.If you're dealing with a single transformer which combines filament and B+ then consider using an indirectly heated rectifier (and specificially some of the damper diodes) as an inexpensive and reliable way of delaying the B+.
Are you using a tube rectifier for your bias? If so, a solid state rectifier will give you a quicker bias voltage and may fix your problem. I've never found that a tube rectifier on the bias was of any sonic improvement imho.
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Follow Ups
- Re: B+ time delay - Gary Kaufman 03/3/0306:09:58 03/3/03 (0)