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Bottlehead Forum Welcome! Need support, you got it. Or share you ideas and experiences. |
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Bottlehead Forum Welcome! Need support, you got it. Or share you ideas and experiences. |
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In Reply to: Re: Hammond 193B and 193C. (plus 157J) - What is the significance of the self-resonance in both power supply and parafeed applications? Have you built posted by freddyi on November 27, 2000 at 20:11:46:
The "resonance" is not significant in a plate choke. The function of a plate choke is to present a high impedance to the plate; this resonance is merely the peak of the impedance curve, which is hopefully high everywhere in the audio band. Effectively, the resonance is highly damped and dominated by the tube's plate resistance.In theory, a resonance in the middle, say 800Hz, gives a well balanced response, with the impedance falling to the same value in the bass (say, 30Hz) and the treble (say, 20kHz). In practice, it seems that stray capacitance sounds worse than stray inductance. Good audio plate chokes should be made with (among other things) good materials that have good dielectric properties. Even in that case, I would like a plate choke to resonate an octave or two higher, at least 1500 and preferably 3kHz.
If you are using chokes not designed for audio, I prefer to err on the side of low capacitance, so I like to see a resonance of at least 4kHz in that case. The one in the Paramour resonates around 5.5kHz (I just checked a sample).
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Follow Ups
- Re: Hammond 193B and 193C. (plus 157J) - What is the significance of the self-resonance in both power supply and parafeed applications? Have you built - Paul Joppa 21:18:45 11/28/00 (2)
- Paul's got it right. - Voltsecond 21:48:32 11/29/00 (0)
- -Significance of self-resonance in plate chokes - Thanks Paul! - freddyi 15:33:03 11/29/00 (0)
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