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1. [Amps] Alpha 77Dx Filament (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Thu, 22 Jan 2009 13:45:46 -0500; Looking for opinions on the subject of 8877 filament voltage... Due to high AC line voltage here (~ 127/254 VAC), my 8877 filament sees approximately 5.75 Vrms (as measured on a Fluke 189 True RMS DV; /archives//html/Amps/2009-01/msg00240.html (8,189 bytes)
2. Re: [Amps] Alpha 77Dx Filament (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Thu, 22 Jan 2009 14:08:08 -0500; Just thought about another possibility... If I add an RF Parts bifilar filament choke to the 77Dx, there may be just enough series IR loss in the choke to get the 8877 back into the specified filamen; /archives//html/Amps/2009-01/msg00241.html (8,946 bytes)
3. Re: [Amps] Alpha 77Dx Filament (score: 1): Author: N7SC <n7sc@charter.net>; Date: Thu, 22 Jan 2009 15:38:57 -0800; Hi Paul... One benefit of isolating the filament circuit and adding the choke is that you can connect the cathode to the filament and use most tubes that have shorts between those two elements. Also,; /archives//html/Amps/2009-01/msg00251.html (10,506 bytes)
4. Re: [Amps] Alpha 77Dx Filament (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Fri, 23 Jan 2009 10:47:32 -0500; I bit the bullet and ordered the RF Parts filament choke for the Alpha 77Dx. I've determined that two of my 8877 suffer from an intermittent cathode-to-filament short -- which explains why there's no; /archives//html/Amps/2009-01/msg00268.html (8,360 bytes)

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