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Re: [Amps] SB-220 parasitic suppressors

To: "Steve Thompson" <g8gsq@ic24.net>
Subject: Re: [Amps] SB-220 parasitic suppressors
From: R.Measures <r@somis.org>
Date: Thu, 4 Nov 2004 06:29:08 -0800
List-post: <mailto:amps@contesting.com>

On Nov 4, 2004, at 12:15 AM, Steve Thompson wrote:


Tony King wrote:
At 01:21 AM 11/4/2004, R.Measures wrote:
<snip>
A GS-35b has 0.12pF of anode-cathode feedback C.  An 8877 has 0.10pF
of it, so they have a fairly similar amount of internal feedback.
Our 8877 low VHF-Q parasitic suppressor retrofit kit has both an
anode suppressor and a cathode suppressor.  It comes with a money
back guarantee.  So far, the only refund has been to a guy who said
he did not know how to solder. --  Today's trivia question:  At its
max freq of 1000MHz, what is the reactance in ohms of the
output/input feedback path in a (g-g) GS-35b?

Very interesting. My guess: 1326
Feedback C on the data sheet is almost certainly measured at low frequency.
The feedback characteristics at V/UHF might be different.

Not for any reason I can see. The dielectric is a vacuum, not an organic compound.

By now there's lots of amps out there using the Russian planar triodes. Has
anyone heard of any problems?

Richard L. Measures, AG6K, 805.386.3734. www.somis.org


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