[Amps] Permeability tuned tuning coils, with taps?

[Fuqua, Bill L]

   There used to be a power limit of 200 Watts in the novice/tech+ sub-band on 10 meters regardless of
license class. Is that still in effect?

73
Bill wa4lav
________________________________________
From: Amps [amps-bounces at contesting.com] on behalf of Chris Wilson [chris at chriswilson.tv]
Sent: Wednesday, January 15, 2014 1:24 PM
To: amps at contesting.com
Subject: Re: [Amps] Permeability tuned tuning coils, with taps?

Wednesday, January 15, 2014, 10:22:05 AM, you wrote:


> 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

Maybe people wonder why I ask? I have a Henry 2000D RF generator a
friend and I are converting to a 10n meter linear. It's near as damn it
done now, a simple thing for many on here, a challenge for us
beginners, as I had to make the PSU and control stuff from scratch.

I bought two big vac caps off Ebay a while back, new old stock. One
seems fine, the other arcs on test at 50% below its rated DC volatge.
These things are *EXPENSIVE* new. Used ones are a lottery, as are old
stock, as there's no way to test the depression inside them without
doing an HV test, after you've bought the thing. So, I was
looking at how Henry used a brass slug permeability tuned tuning coil
of heavy copper tube, instead of a variable tune capacitor, and a
sheet metal flapper cap for loading. I was wondering if at a later
stage I could plagiarise the design to make a 20 meter or even a 20 / 40
meter version and make a longer coil, with taps
for other frequencies, and just have to use one vac cap for load? I am
in the race car engineering business, so have good fabrication
facilities, the hardware for a bigger brass slug tuned circuit would
be pretty straightforward. Photo of the Henry 2000D deck is at
http://www.gatesgarth.com/henry6.jpg

Thanks everyone.




--
Best regards,
 Chris                            mailto:chris at chriswilson.tv

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