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Re: [Amps] RF Parts tubes

To: "Amps Reflector" <amps@contesting.com>
Subject: Re: [Amps] RF Parts tubes
From: "Roy Koeppe" <royanjoy@ncn.net>
Date: Sun, 17 Dec 2006 12:07:43 -0600
List-post: <mailto:amps@contesting.com>
"   Does anyone here have any knowledge of the "taylor" 572B's
advertised by RF parts?? "


My experience with Taylor 572B's from RFP is they are rather
short-lived, about one year's worth of daily use on CW, at five hours
average per day. I run them at 425 mA for the pair, well within ratings,
and have filament voltage set accurately to 6.3 key-up on an SB-200
equipped with auto-bias (cut off when no drive is present).
Unfortunately, filament voltage sags slightly during key down due to the
common filament/plate transformer. I am planning to add a form of
regulation to the filament supply, keeping in mind my motto: simplicity
is ingenuity. The blower on the amp has been beefed up greatly.

My current pair is RFP-brand and am counting the months on these.

73,    Roy    K6XK

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