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1. [Amps] Driving Z of 572-b's (score: 1): Author: wb8jkr@juno.com; Date: Fri, 10 Oct 2003 17:34:41 -0400; I know all the variables etc, but can anyone give me the "approximate" cathode driving Z of a pair of 572-B's at full input? I'm thinking (guessing) about 100-120 ohms? Mark WB8JKR __________________; /archives//html/Amps/2003-10/msg00082.html (6,395 bytes)
2. Re: [Amps] Driving Z of 572-b's (score: 1): Author: "carl seyersdahl" <carlseye@tampabay.rr.com>; Date: Sat, 11 Oct 2003 11:18:25 -0400; According to my books the driving impedance of the 572B is 215 ohms, so two of them would be about 107 ohms. that's as close as one can get I guess. carl / kz5ca -- Original Message -- From: <wb8jkr@; /archives//html/Amps/2003-10/msg00084.html (8,070 bytes)
3. RE: [Amps] Driving Z of 572-b's (score: 1): Author: "PAUL HEWITT" <wd7s@att.net>; Date: Sat, 11 Oct 2003 07:38:58 -0700; Hi Mark Bill Orr has it listed at 215 ohms per tube so half that for a pair. 73, Paul PAUL HEWITT WD7S PRODUCTIONS QRO HOMEBREW COMPONENTS http://wd7s.home.att.net ___________________________________; /archives//html/Amps/2003-10/msg00085.html (8,411 bytes)

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