Hello, Phil,
The Russian military grade tubes are more rugged that the commercial
ones, but there is a limit of the excessive voltage you can apply to the
tube.
Say, in case with GS-35 (recommended 3000 V @ 1.4 A) it has been used at
3500 V @ 2 A for years.
You can go on and experiment with the tube but the general common sense
says one should not exceed the voltage more than a few hundred volts.
If you are planning to use you PS why do not you try GU-35B ? It is
rated at 5000 V @ 2 A ?
There are other powerful tubes, say like GU-78B (could be classified as
if 4CX300 in the Wetern classifcation if it would have existed) rated at
3000 V @ 2 A
Regards, Anton Koval, UT7CT
=========================
CT Ham Radio Devices (CT HRD)
Fine Range of Han Keys & paddles
Collectable Stuff. Svetlana & Other
Russian Tubes. DX Shack Rentals
tony@uch.net ICQ#19487420
www.dxham.com
----- Original Message -----
From: Phil <philhss@breathemail.net>
To: Amps <amps@contesting.com>
Sent: Monday, October 23, 2000 9:57 PM
Subject: [AMPS] GU84b Question
>
> Ladies / Gentlemen,
>
>
> I'm thinking of putting a single GU84b into SSB service on HF.
>
> The datasheet for this tube states that a maximum voltage for the anode
> should be 2.2Kv, but then goes on to say that the anode can withstand
4.25Kv
> during Pulsed service.
>
> My question is;
> Has anyone on this reflector operated this tube at a higher voltage than
> 2.2Kv but not during pulse operation? I'm thinking that I could run the
tube
> with, say, 3Kv or 3.5KV without problems (unless the tube might exceed
> dissipation limits for the anode?) - unless somebody knows otherwise!
>
> The reason for wanting to run the tube at this higher anode voltage, is
that
> my anode supply can happily supply up to 4.5Kv at 1A, possibly up to 1.2A
> (although I've not tried it at this level of current), but to get the
> required power input level the supply cannot (I suspect) provide adequate
> current (around the 1.5A level) at 2.2Kv.
>
> Of course, the simplest answer may be to build another anode supply - but
> I'm trying to avoid having to do so......
>
> Thanks for any help offered,
>
> Regards,
>
> Phil Smeaton
> G0HSS
>
>
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