[Amps] Cathode input circuit

[Dave M]

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/


......................................................................................................
 
73     VE3DV , Dave



 

> From: k4elv at bellsouth.net
> To: amps at 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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