I thought it may be a GU81M at first, but that uses a slide-in socket and has
the two connections at the top of the glass envelope, whereas the 813 only has
the one. I agree though that the tube functions pretty much as a big, fat
813. Apparently GU81Ms are pretty much indestructible. OK, if not you hit it
with a 4# hammer, but otherwise...
I've seen some really good designs from eastern Europe using this tube.
As for the one Roger means, I don't recognise it
cheers
Dave G0OIL
--- On Mon, 8/3/10, DF3KV <df3kv@t-online.de> wrote:
From: DF3KV <df3kv@t-online.de>
Subject: Re: [Amps] What tube is this?
To: amps@contesting.com
Date: Monday, 8 March, 2010, 10:40
Most probably the GU-81, 800W anode dissipation convection cooled.
http://www.pbase.com/df3kv/gu81_at_friend
73
Peter
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Roger
Sent: Montag, 8. März 2010 08:26
Cc: Amps@contesting.com
Subject: [Amps] What tube is this?
A while back I saw a surplus glass Russian tube that resembled an 813 on
steroids. It was claimed to run a KW without requiring forced air. I've
seen glass tetrodes that are supposed to go a KW and resemble the
4-1000A, but that's not it. IIRC the plate resembled an 833 as to shape,
but the tube is round and long like an 813 although it runs considerably
more power. The socket appeared to be a "twist lok" type. It was
relatively inexpensive, but a great one for those "glow in the dark"
projects. They even had sockets listed, but try as I might, I've not
been able to find the site or tube. BTW the I remember the site had both
tubes and sockets.
Any thoughts? Any ideas as to what tube? What site?
Thanks,
Roger (K8RI)
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