[Amps] Permeability tuned tuning coils, with taps?

[peter chadwick]

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 at gmail.com>
 To: "'Chris Wilson'" <chris at chriswilson.tv>, amps at 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 at contesting.com] On Behalf Of Chris Wilson
 Sent: Tuesday, January 14, 2014 1:54 PM
 To: amps at 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 at chriswilson.tv
 
 _______________________________________________
 Amps mailing list
 Amps at contesting.com
 http://lists.contesting.com/mailman/listinfo/amps
 
 
 ---
 This email is free from viruses and malware because avast! Antivirus protection is active.
 http://www.avast.com
 
 _______________________________________________
 Amps mailing list
 Amps at contesting.com
 http://lists.contesting.com/mailman/listinfo/amps