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1. [Amps] 3-500Z to 3CX1200D7 (score: 1): Author: PlanerGuy@aol.com; Date: Wed, 26 Jul 2006 17:14:36 EDT; What is generally involved with changing from a pair of 3-500Z tubes to a pair of 3CX1200D7's, not including HV power supply concerns? Reason I ask is that I was offered a set of 100% 3CX1200D7 pulls; /archives//html/Amps/2006-07/msg01192.html (6,789 bytes)
2. Re: [Amps] 3-500Z to 3CX1200D7 (score: 1): Author: "Bob Maser" <bmaser@tampabay.rr.com>; Date: Wed, 26 Jul 2006 17:24:12 -0400; You will need a much bigger filament xfmr, bigger blower. I just replaced my 8877 for 1 3CX1200D7 in my Henry 4K-Ultra. It works fine. If I were you, I would consider just using 1 tube and block off; /archives//html/Amps/2006-07/msg01193.html (7,588 bytes)

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