THe Svetlana 572b had difficult holding off the high voltage and would
flashover. There were reported elsewhere
in this mailing list. Ameritron, reportedly, had difficulty getting the
Svetlana 572s to pass basic HV test.
If you search this reflector, you'll find quite a few posts about them.
I've had good luch with the Taylor 572b recently
Ed N1TS
----- Original Message -----
From: "Alek Petkovic" <vk6apk@eon.net.au>
To: <amps@contesting.com>
Sent: Saturday, August 28, 2004 8:46 AM
Subject: [Amps] Svetlana 572B and FL-2100Z
> A friend of mine Has recently bought a FL-2100Z and it is fitted with
> Svetlana 572B tubes.
>
> He has had a couple of bangs so far on 20m resulting in the loss of the 22
> Ohm parasitic suppressor resistors.
>
> Also, a previous owner has put 33 Ohm wire wound resistors in the grid
> circuit. The originals were of course non inductive resistors which are
> very hard to source here in Australia.
>
> I am sending him some new 33 Ohm resistors and some nichrome wire to make
> up some new suppressors plus a glitch resistor.
>
> I am also sending him some new Cetron tubes and have advised him to get
rid
> of the Svetlanas and put some extra resistance in the filament line to
> reduce the voltage to a safer value.
>
> Has anybody had any experience with Svetlana 572B tubes? I was under the
> impression that they spelled trouble in hf amplifiers. Is this a fact?
>
> 73, Alek
> vk6APK
>
>
> http://www.qrz.com/vk6apk
> http://profiles.yahoo.com/vk6apk
>
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