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1. [AMPS] Alpha 76A tube change. (score: 1): Author: ewell@cvc.net (Edward Ewell); Date: Mon, 07 Aug 2000 12:36:53 -0700; I have the Alpha 76A three tube model Amplifier and I want to upgrade to use two 3CX800A tubes any suggestions about what to watch out for? I have changed the filament transformer, changed the plate; /archives//html/Amps/2000-08/msg00155.html (7,211 bytes)
2. [AMPS] Alpha 76A tube change. (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Mon, 7 Aug 2000 13:53:00 -0700; Hi Ed: You are on the right track to change the 3CX800A7 tubes in for the 8874 tubes. I did the same thing. You will need a new pair of chimneys. Two of the 3CX800A7 tubes act like 3 of the 8874 tube; /archives//html/Amps/2000-08/msg00159.html (8,279 bytes)
3. [AMPS] Alpha 76A tube change. (score: 1): Author: ewell@cvc.net (Edward Ewell); Date: Fri, 18 Aug 2000 12:43:27 -0700; A reply to all who gave me the input on their upgrades, excellent information. I found the modification going to the 3CX800A7 tube fairly easy. Did have a problem coming up with chimneys for the new; /archives//html/Amps/2000-08/msg00357.html (7,198 bytes)
4. [AMPS] Alpha 76A tube change. (score: 1): Author: 2@vc.net (measures); Date: Fri, 18 Aug 2000 17:36:49 -0700; Alpha uses no speedup circuit for the vacuum-relay. To avoid hotswitching with modern radios, a speedup circuit is needed. See Fig. 7B on my Web site. The Alpha bias system switches to non-linear bi; /archives//html/Amps/2000-08/msg00373.html (7,741 bytes)

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