I vaguely remember seeing a 4 channel, 2-10 MHz, 100 watt output commercial
amplifier using three 'instant heat' 6146s (actually QZ06-20)which used
permeability tuning on the PA coils. I think the coil had three taps to cover
the frequency range: it was driven from a nominal 10 watt input SSB packset,
and ran from a 12 volt vehicle supply, with a germanium transistor DC-DC
inverter. The packset was mainly germanium transistors, too....That was 50
years ago.....
73
Peter G3RZP
========================================
Message Received: Jan 15 2014, 09:23 AM
From: "Saandy" <alexeban@gmail.com>
To: "'Chris Wilson'" <chris@chriswilson.tv>, amps@contesting.com
Cc:
Subject: Re: [Amps] Permeability tuned tuning coils, with taps?
As far as known, it has never been done before, simply because nobody really
needed it: it was more of a solution waiting for a problem.
Winding coils on a core was done to reduce size, and concocting some tuning
mechanism would negate that.
If you have the patience and the inclination, you can do it, but definitely
as a linear ASSEMBLY, NOT IN TOROIDAL FORM.
Alex 4Z5KS
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Chris Wilson
Sent: Tuesday, January 14, 2014 1:54 PM
To: amps@contesting.com
Subject: [Amps] Permeability tuned tuning coils, with taps?
14/01/2014 11:52
Are there any working examples of amplifiers using Pi-L networks with a
permeability tuned tuning coil, but also using taps on it? Thanks.
--
Best Regards,
Chris Wilson.
mailto: chris@chriswilson.tv
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