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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: How to use dissimilar chokes? posted by DAK on May 13, 2015 at 12:59:41:
How much current is needed - i.e what's the idle current of the KT90s?
As far as order, larger choke followed by smaller cap then smaller choke and larger cap will give a lower circuit "Q", and will have a better transient response - less ringing on a current step.
Eli's suggestion of a small input cap is essential. Without it, stored energy in the choke can be delivered into the reverse-biased diode, likely destroying it, on turn-off. The cap limits how high this voltage can go - I'd be inclined to use 0.1 uF myself - a 8 Hy choke carrying 150 mA stores about 0.1 joule (1/2* I^2 * L), and that amount of energy will charge a 0.1 uF cap to 1000V...
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Follow Ups
- RE: How to use dissimilar chokes? - Tom Bavis 12:22:11 05/15/15 (2)
- RE: .01uf input cap for cLCLC filter - DAK 09:14:13 05/16/15 (1)
- RE: .01uf input cap for cLCLC filter - Eli Duttman 19:49:02 05/16/15 (0)
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