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[Fwd: [AMPS] Edge wound .1-40 uH Variable from SSN - comments-?]

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Subject: [Fwd: [AMPS] Edge wound .1-40 uH Variable from SSN - comments-?]
From: Jim" < (Jim)
Date: Fri, 12 Feb 1999 18:12:07 -0800
I saw the "jig" that is used to roll the coil in the Nye Viking MB V A, at
the factory in north Idaho. Hard to explain, but really works neat!!   Just
some wheels and rollers.....hooked to a lathe at very slow speed.....

BTW Rich and Carl, What do you think of the idea that Henry uses for there
tanks in some of there amps. ??

Having a fixed value of C tune, and a roller coil for the "plate tuning"
..It uses a Pi-L and a standard loading cap.   There is no C tune used on 10
and 15 meters. Just the tube and stray capacitance. The amps put out a good
1500 watts on 10 and 15 meters both......(2kd5)....They use "door knobs" for
the tune caps. Using a neat switching arrangement for selecting them......

Besides the high filament voltage and the low value of R across the
electrolytic caps, the amp works great....

Comments please...
What is the current through the door knob caps ?

Thanks and 73

Jim W7RY

-----Original Message-----
From: Peter Chadwick <>
To: 'amps' <>
To: <>
Date: Friday, February 12, 1999 9:55 AM
Subject: RE: [Fwd: [AMPS] Edge wound .1-40 uH Variable from SSN -

>How do they actually do the edge winding? Must take a fair amount of force
>to bend the strip on edge, so what's the magic technique?
>Peter G3RZP
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