[Amps] What tube is this?

[DAVE WHITE]

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 at t-online.de> wrote:

From: DF3KV <df3kv at t-online.de>
Subject: Re: [Amps] What tube is this?
To: amps at 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 at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Roger
Sent: Montag, 8. März 2010 08:26
Cc: Amps at 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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