Interesting Design Mike , I found this with a google serch , I hope it helps:
http://franksnotes.wordpress.com/2007/05/20/linear-amp-tuned-input/
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73 VE3DV , Dave
> From: k4elv@bellsouth.net
> To: amps@contesting.com
> Date: Mon, 1 Nov 2010 09:28:14 -0500
> 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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