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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: Re: Since CT cathode R versus Pete Millett Style multiple R's.... posted by drlowmu on November 6, 2006 at 22:32:55:
In a single ended stage, paralleling cathode resistors has an
advantage of reducing total noise by noise power averaging.. You
get a reduction of sqrt(N) dB for N parallel devices...However, this is a differential stage, so any noise is going to be
common mode and, in theory, is equally divided and then summed. So...
Shant matter... One might argue that ripple and noise off the PSU
will swamp the resistor noise regardless. :)I agree with the SE stage recommendation. Hence, paralleling cathode
R's or cathode JFETs in phono stages and what not. In the case of a
high-gm tube, it makes alot of sense to fight the noise when you are
applying so much gain.-- Jim
-- Jim
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- The parallel "rule" is dependent on the design case.... - Jim Doyle 22:53:36 11/06/06 (0)
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