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[Amps] AL-1200 Tuning Capacitor Range

Subject: [Amps] AL-1200 Tuning Capacitor Range
From: Kim Elmore <>
Date: Fri, 17 Oct 2014 23:43:17 -0500
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I have an AL-1200 that works very well using the 3CX1200A7 tube, but at the bottom end of 15 m the plate tune capacitor needs to be almost completely unmeshed for proper tuning. The load control is not near either extreme. I'm not completely convinced the PA is properly tuned; I figure this one has just a wee bit more stray capacitance. Would moving the 15 m tap one turn help this? If so, which way should I go: remove a turn or add a turn of inductance?

Kim N5OP

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