That circuit goes back to the early days of SSB linears and is in QST, HB,
and possibly the early edition SSB Manuals
Carl
KM1H
----- Original Message -----
From: "Mike Lord" <k4elv@bellsouth.net>
To: <amps@contesting.com>
Sent: Monday, November 01, 2010 10:28 AM
Subject: [Amps] Cathode input circuit
>A question for the group. Some time back, ZL1AXB published a circuit for a
>single 813 grounded grid, using a tuned coil input circuit. He referred to
>it as a "bifilar wound coil." I built the amp and it works like a champ.
>The only other reference to this tuned input I could find was in Orr's 18th
>edition where he used it on a 6 meter amp. (pp 747 -749). I couldn't find
>any further discussion by Orr. Pat's circuit covered 40 - 10 meters. I
>would like to use this circuit on 80 and 160. Is there a formula for
>winding the coil? As anyone else had experience with this tuned input?
>Thanks. Mike K4ELV
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