[Amps] AL-1200 Tuning Capacitor Range

[Kim Elmore]

Thanks, both. Had I given this more than passing thought at 11 PM, the answer would have obvious!

Next chance I have, I'll see if I can spread out the turns a bit. I can't get the cover off where it sits and  It's a heavy beast so not much fun to move around. 

Kim N5OP

"People that make music together cannot be enemies, at least as long as the music lasts." -- Paul Hindemith

> On Oct 18, 2014, at 0:05, "Dave Hachadorian" <k6ll.dave at gmail.com> wrote:
> 
> Reduce the inductance.  This is usually most easily done by spreading out the turns on the 21 MHz coil.
> 
> Dave Hachadorian, K6LL
> Yuma, AZ
> 
> 
> -----Original Message----- From: Kim Elmore
> Sent: Friday, October 17, 2014 9:43 PM
> To: amps at contesting.com
> Subject: [Amps] AL-1200 Tuning Capacitor Range
> 
> 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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