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1. [Amps] FW: Tuned input (score: 1): Author: "Phil Clements" <philc@texascellnet.com>; Date: Tue, 24 Jan 2006 12:38:11 -0600; If one wants to depart from the traditional Pi input network a parallel L/C configuration can be utilized. A tapped fixed inductor from the cathode(s) to ground, shunted by 300 pf Arco trimmers for; /archives//html/Amps/2006-01/msg00581.html (8,027 bytes)
2. Re: [Amps] FW: Tuned input (score: 1): Author: Roger D Johnson <n1rj@adelphia.net>; Date: Tue, 24 Jan 2006 13:51:09 -0500; This would work fine when the input Z is near 50 Ohms (which most are). I think you would need a lot more than 300 pf to get the proper Q on the lower bands. 73, Roger -- Remember the USS Liberty (AG; /archives//html/Amps/2006-01/msg00582.html (6,924 bytes)
3. Re: [Amps] FW: Tuned input (score: 1): Author: "Phil Clements" <philc@texascellnet.com>; Date: Tue, 24 Jan 2006 14:43:54 -0600; The two tube kit for the Alpha 77SX included a 2:1 unun transformer to be inserted in series with the input line. This matches the 50 ohms out of the input tank to the 25 ohm impedance of a pair of; /archives//html/Amps/2006-01/msg00586.html (8,077 bytes)

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