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1. [Amps] What tube is this? (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Mon, 08 Mar 2010 02:25:48 -0500; 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 r; /archives//html/Amps/2010-03/msg00125.html (8,060 bytes)
2. Re: [Amps] What tube is this? (score: 1): Author: "DF3KV" <df3kv@t-online.de>; Date: Mon, 8 Mar 2010 11:40:16 +0100; Most probably the GU-81, 800W anode dissipation convection cooled. http://www.pbase.com/df3kv/gu81_at_friend 73 Peter A while back I saw a surplus glass Russian tube that resembled an 813 on steroids; /archives//html/Amps/2010-03/msg00127.html (8,783 bytes)
3. Re: [Amps] What tube is this? (score: 1): Author: Alek Petkovic <vk6apk@bigpond.com>; Date: Mon, 08 Mar 2010 20:03:07 +0800; GU81M http://www.nd2x.net/ur4ll/GU81M.jpg Available at http://www.nd2x.net/ur4ll.html Or maybe it was the GK71 http://www.nd2x.net/ur4ll/GK71.jpg Available from the same source. 73, Alek. VK6APK http; /archives//html/Amps/2010-03/msg00128.html (9,644 bytes)
4. Re: [Amps] What tube is this? (score: 1): Author: DAVE WHITE <mausoptik@btinternet.com>; Date: Mon, 8 Mar 2010 14:49:11 +0000 (GMT); 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 fun; /archives//html/Amps/2010-03/msg00129.html (10,038 bytes)
5. Re: [Amps] What tube is this? (score: 1): Author: Roger <sub1@rogerhalstead.com>; Date: Mon, 08 Mar 2010 14:48:28 -0500; Thanks all, It was the GU81. I had forgotten about the grid connection on top. Fairly reasonable, but there's probably not much demand for a glass bottle that big or in that configuration any more. I; /archives//html/Amps/2010-03/msg00134.html (10,860 bytes)

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