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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