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Re: [Amps] Parasitic suppressors on GI-7B.

To: Ian White GM3SEK <gm3sek@ifwtech.co.uk>, amps@contesting.com
Subject: Re: [Amps] Parasitic suppressors on GI-7B.
From: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Reply-to: g3rzp@g3rzp.wanadoo.co.uk
Date: Mon, 11 Sep 2006 22:04:59 +0200 (CEST)
List-post: <mailto:amps@contesting.com>
Ian said:
>2W or 3W metal film resistors are the modern substitute for solid 
carbon.<

Where I somewhat disagree is that 2 or 3 watt resistors provide enough 
dissipation. However, like all these things 'it all depends'
If you have a tube prone to parasitics and needing a large (comparatively) 
inductance in the suppressor, then operation on 10, 12 and maybe 15 can demand 
more resistor dissipation than in tube with a good short grid to ground 
connection.

>As others have said, if the grid ring of a UHF tube like the GI-7B is 
solidly grounded (and if there are no other unexpected feedback paths) 
then it may not actually need a parasitic suppressor.<
There we have total agreement. The posh term for finding out is ' a process of 
eclectic empiricism'. Others call it 'suck it and see' (which I recognise may 
have slightly different connotations the other side of the Atlantic)
73
Peter G3RZP
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