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Re: [Amps] SB-220

To: Steve Thompson <g8gsq@ic24.net>
Subject: Re: [Amps] SB-220
From: R.Measures <r@somis.org>
Date: Wed, 3 Nov 2004 13:15:17 -0800
List-post: <mailto:amps@contesting.com>

On Nov 3, 2004, at 10:45 AM, Steve Thompson wrote:


On Wednesday 03 November 2004 18:23, Will Matney wrote:
To all,

A quick question here, and may open up a big can of worms, if there is
no such things as parasitics in amplifiers, why do they all come with
parasitic suppressors on the anode leads?
There certainly are parasitics (unwanted vhf oscillation) - especially with
tubes with long grid leads - but not every amplifier will have the
gain/feedback/load to allow oscillation if suppressors aren't fitted.


It's likely that few amplifier builders have the equipment to properly assess
whether their amplifier needs a supressor, and/or whether the suppressor they
fit actually does the job of reducing the gain by the right amount at the
right frequency.

Steve -- In my experiences, 813 amplifiers do not need a VHF parasitic oscillation suppressor.
Richard L. Measures, AG6K, 805.386.3734. www.somis.org


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