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In Reply to: RE: Plate Choke vs CCS posted by Brinkman on November 05, 2009 at 10:28:33
My observations having used both is that use of an audio choke (experience limited to Lundahl) in the plate instead of a cascode CCS (with IXYS depletion mode MOSFETs) results in a slightly "softer" sound. By "softer" I mean that the CCS is perhaps more precise about transients and gives things a slightly brighter sheen, but nothing is really lost with choke loading by comparison. In my view the choice is guided by overall voicing needs and by cost for medium and low Rp tubes (<15K). For higher Rp tubes (extreme example = 12AX7), the CCS is the only choice of the two that will really give extended high frequency performance.
So if I have a design that needs a bit more air on the top end, I would choose a cascode CCS, but if the choke hits it just right, the sound with the choke tends to accommodate tipped up recordings a bit better.
Kevin Carter
K&K Audio
www.kandkaudio.com
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