G'day Kim.
Dunno if the AL-1200 is the same as the AL-1500 where the markings on
the front panel indicate that the plate cap should be tuning at the spot
you mentioned.
Yeah, I know. Different tube but knowing Ameritron, they probably have
the same silk screening pattern for both amps.
With my AL-1500, its actually up a bit from that mark at the "17" position.
If your amp puts out the expected full grunt at that fully open
position, then perhaps you shouldn't worry too much about it.
If not, then Dave's suggestion may be good advice.
73, Alek.
VK6APK
On 18/10/2014 1:05 PM, Dave Hachadorian 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@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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