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1. [Amps] Testing tubes for an Alpha 78 (score: 1): Author: Paul Gerhardt <phgerhardt@gmail.com>; Date: Thu, 31 Dec 2009 17:28:44 -0500; Can you test tubes in an Alpha 78 one at a time? What is a good procedure for doing this? Paul Gerhardt K3PG http://pgerhardt.blogspot.com QRP ARCI 6674 FP 274 Raytrack DX2000L Clipperton L SB-230 __; /archives//html/Amps/2009-12/msg00582.html (6,518 bytes)
2. Re: [Amps] Testing tubes for an Alpha 78 (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 31 Dec 2009 18:22:39 -0500; You sure can. Plug the empty hole with a tissue and drive it with around 25-30W on 40M. The input VSWR will be off but even a fussy rig should still give sufficient drive. If it looks good on 40 then; /archives//html/Amps/2009-12/msg00584.html (7,765 bytes)
3. Re: [Amps] Testing tubes for an Alpha 78 (score: 1): Author: "Van K7VS" <wa7fab@cdsnet.net>; Date: Thu, 31 Dec 2009 20:17:30 -0800; that's exactly how Alpha suggests you check the tubes, one at a time. in fact regarding one of the three holers they suggested eliminating one of the tubes (as I thought one of them was bad) and runn; /archives//html/Amps/2009-12/msg00594.html (7,626 bytes)
4. Re: [Amps] Testing tubes for an Alpha 78 (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Fri, 1 Jan 2010 11:27:36 -0500; Thats also the way National recommended it back in 63. It was also the method used for customers to check the matching of their tubes. I talked with Ray Heaton many times as I was a secondary source; /archives//html/Amps/2010-01/msg00001.html (8,081 bytes)

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