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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: if inductance is the main criteria, why not non-inductive Mills WW? (nt) posted by jarthel on October 19, 2006 at 17:55:24:
Wirewound resistors labeled "non-inductive" are useful only at lower frequencies. As the test frequency increases, say above 1 mHz or so, the windings lose balance and become increasingly reactive. They're great as test loads or attenuators on an amplifier, because they don't produce back-emf at audio frequencies. At RF, however, they are not much better (if at all) than other wirewound devices. In fact, they're much more likely to create HF parasitic oscillations than to prevent them. At one time, manufacturers of these resistors published charts showing inductance curves VS. frequency. I'm not sure if any of that info is available online.TK
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Follow Ups
- Re: why not non-inductive Mills WW? (nt) - Triode_Kingdom 19:00:36 10/19/06 (2)
- Re: why not non-inductive Mills WW? (nt) - Jim McShane 05:53:14 10/20/06 (1)
- Re: why not non-inductive Mills WW? (nt) - Triode_Kingdom 09:46:32 10/20/06 (0)
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