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1. [Amps] Alpha 77Dx Filament Mod Update (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sat, 31 Jan 2009 22:16:18 -0500; For those interested, I've begun to document the filament mods conducted on my Alpha 77Dx. Recall, that I wanted to (1) decrease the filament voltage to the 8877; and (2) float the filament above gro; /archives//html/Amps/2009-01/msg00381.html (9,703 bytes)
2. Re: [Amps] Alpha 77Dx Filament Mod Update (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Sun, 1 Feb 2009 11:23:45 -0500; Hi Paul, I was always under the impression that the 8877 should have the filament tied to the cathode in the amp as there is little tolerance in the voltage that the tube can withstand between cathod; /archives//html/Amps/2009-02/msg00006.html (12,207 bytes)
3. Re: [Amps] Alpha 77Dx Filament Mod Update (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sun, 1 Feb 2009 15:39:46 -0500; Gary, I agree with that assessment. And that probably explains why the AL-1500 is tied since (I believe) Tom designed that amp for Ameritron. As to how important this is in real operation, I am not; /archives//html/Amps/2009-02/msg00020.html (10,227 bytes)
4. Re: [Amps] Alpha 77Dx Filament Mod Update (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Mon, 2 Feb 2009 11:52:11 -0500; Quoting myself: screw from these amps. The chassis and neutral can be un-linked by cutting a jumper at the Cinch-Jones power plug. Then, the three-wire power cord is replaced with a four-wire cord in; /archives//html/Amps/2009-02/msg00027.html (8,121 bytes)

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