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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