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[Amps] Using door knob caps as padders/blockers

To: <amps@contesting.com>
Subject: [Amps] Using door knob caps as padders/blockers
From: philk5pc@tyler.net (Phil Clements)
Date: Wed, 22 May 2002 10:27:13 -0500
>   RE  reading specs:  It is amazing that a number of Ham amplifiers use
> 500pF and 1000pF 5kV doorknob caps for Tank ciruit padders which
> obviously need a cap that can handle more current.  The cap mfg's specs
> make it  clear that the 500pF and 1000pF units are intended only for
> bypass and coupling service.  Thus, to make a 400pF C-tune padder, 4,
> 100pF, 5kV units are paralled on Cu plates.  The Alpha 77SX is a good
> bad-example.
>
> cheers.
>
> -  R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,

Amen, Rich!
It is obvious that 160 meters was an after-thought with the
77 series from Alpha. Also, the 77SX tank coil is the same
as the 77DX. (2 tubes vs one)

Another one for the list is the SB-1000 from Heath. A suitable
mica replacement is available from Ameritron for the tank
door knobs in this unit.

(((73)))
Phil, K5PC




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