[Yaesu] re 572B's in FL-2100

Tue, 15 Jan 2002 08:16:44 -0500

According to RF Parts, because of higher amplification factor, the Svetlana
tubes can go into self oscillation during stand-by because of low cut off
bias.  They sell a kit ($4.50 US in my old catalog) to change the bias
supply to a voltage doubler to cure the problem.  I have Cetrons in my
SB-200 which have performed well and given no trouble.

Steve W4IMF

----- Original Message -----
From: "Fern Rivard" <[email protected]>
To: <[email protected]>
Sent: Monday, January 14, 2002 7:50 PM
Subject: [Yaesu] re 572B's in FL-2100

>     Could some please enlighten me as to the best tubes to use as
> replacements in Yaesu FL-2100B amplifier.  I see that RF Parts carries at
> least three different brands. It looks like the Taylor replacements are
the
> best buy but there is a warning that using the Svetlana brand would
require
> a modification to the FL-2100 amp. What is this mod that they are talking
> about?
>     Another supplier only carries the National brand which I have never
> heard of before but they are made in China. My guess is that those tubes
> can't be used in the horizontal position.
>     Any comments or suggestions would be greatfully appreciated.  73's
from
> Fern
>
>
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