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21. Re: [Amps] 813's (score: 1): Author: Gudguyham@aol.com; Date: Sun, 28 May 2006 05:33:47 EDT; Sorry, I read my e-mails in the wrong sequence. I should stop doing that. Hi Hi but the pin orientation "2 and 6" in the vertical plane is the key issue!! ____________________________________________; /archives//html/Amps/2006-05/msg00444.html (7,795 bytes)
22. [Amps] 813's (score: 1): Author: "carl s." <carlseye@tampabay.rr.com>; Date: Sun, 28 May 2006 17:14:35 -0400; Anyone know what the input impedance of the 813 might be in g-g opn.?? carl / kz5ca _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/m; /archives//html/Amps/2006-05/msg00457.html (7,588 bytes)
23. Re: [Amps] 813's (score: 1): Author: "Peter Voelpel" <df3kv@t-online.de>; Date: Sun, 28 May 2006 23:32:48 +0200; Should be 270 Ohm 73 Peter Anyone know what the input impedance of the 813 might be in g-g opn.?? carl / kz5ca _______________________________________________ Amps mailing list Amps@contesting.com ht; /archives//html/Amps/2006-05/msg00458.html (7,559 bytes)
24. Re: [Amps] 813's (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Sun, 28 May 2006 18:05:08 -0400; Peter, While on the subject, you wouldn't know the approximate G1 input impedance would you? That is with the specified plate and grid voltages on the tube. Concerning the heater position, the only w; /archives//html/Amps/2006-05/msg00459.html (8,951 bytes)
25. Re: [Amps] 813's (score: 1): Author: Larry <larry@w7iuv.com>; Date: Sun, 28 May 2006 15:40:31 -0700; Carl, The 813 cathode impedance when run G-G with 2500 volts on the anode and at least 200 ma. anode current will be on the order of 270 ohms. If you push the tube hard it will be slightly lower. 73,; /archives//html/Amps/2006-05/msg00460.html (7,981 bytes)
26. Re: [Amps] 813's (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 29 May 2006 07:21:09 +0100; If there's no grid current flowing, doesn't it just look like a capacitor for all normal purposes? Steve _______________________________________________ Amps mailing list Amps@contesting.com http://l; /archives//html/Amps/2006-05/msg00469.html (7,688 bytes)
27. Re: [Amps] 813's (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Mon, 29 May 2006 09:52:49 -0400; I may have an idea where the confusion comes from. RCA made two different 813's one with a graphite plate and the newer version with a metal plate. There may be other internal differences between the; /archives//html/Amps/2006-05/msg00486.html (8,529 bytes)
28. Re: [Amps] 813's (score: 1): Author: Bill Turner <dezrat@copper.net>; Date: Mon, 29 May 2006 14:29:21 -0700; ORIGINAL MESSAGE: ** REPLY SEPARATOR ** Does it have a sensor that shuts it down when the ship rolls? :-) Bill, W6WRT _______________________________________________ Amps mailing list Amps@contesting; /archives//html/Amps/2006-05/msg00495.html (8,278 bytes)
29. Re: [Amps] 813's (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Wed, 31 May 2006 10:58:25 +0200 (CEST); Not only did Collins (amongst many others) run 813s in the horizontal position, there was even a Collins civil aircraft TX of the late 40s, early 50s which used an 813 at an angle of about 60 degrees; /archives//html/Amps/2006-05/msg00541.html (8,108 bytes)
30. Re: [Amps] 813's (score: 1): Author: GGLL <nagato@arnet.com.ar>; Date: Wed, 31 May 2006 09:42:31 -0300; So as long as the filament is contained in the vertical plane, any tilt position of the tube is ok. At least for a fix (not mobile) use. Best regards Guillermo - LU8EYW. Peter Chadwick escribi&oacute; /archives//html/Amps/2006-05/msg00548.html (8,139 bytes)
31. [Amps] 813's (score: 1): Author: Tom Osborne <w7why@frontier.com>; Date: Mon, 21 Dec 2015 10:57:04 -0800; Why are 813 tubes considered 'dirty'? I have an old amp in the attic I haven't used for a long time that has a pair of 813's in it I have read somewhere that they are a very 'dirty' tube. I'd assume; /archives//html/Amps/2015-12/msg00042.html (6,861 bytes)
32. [Amps] 813's (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 22 Dec 2015 06:19:39 -0800; Why are 813 tubes considered 'dirty'? I have an old amp in the attic I haven't used for a long time that has a pair of 813's in it I have read somewhere that they are a very 'dirty' tube. I'd assume; /archives//html/Amps/2015-12/msg00045.html (7,264 bytes)
33. Re: [Amps] 813's (score: 1): Author: Tom Osborne <w7why@frontier.com>; Date: Tue, 22 Dec 2015 09:43:27 -0800; Hi Colin When I was using this amp it didn't have a tuned input. I was using a Yeasu FT-102 to drive it and it had the pi-net so didn't bother with the input tuning. I had a power transformer out of; /archives//html/Amps/2015-12/msg00051.html (8,110 bytes)
34. Re: [Amps] 813's (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Tue, 22 Dec 2015 18:15:46 +0000; Graphite is always messy, I have gotten it on hands clothes and it is hard to wash out. I think perhaps they should not have earned such a reputation. I believe the problem stems from the fact that m; /archives//html/Amps/2015-12/msg00052.html (8,685 bytes)
35. Re: [Amps] 813's (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Wed, 23 Dec 2015 17:23:36 -0500; I save my glow bottles for Class C AM use and as modulators. A couple of 304TL's can really light up the room as can HK-354C's, and 250TH's. Some long years ago I ran a pair of VT-127A's (aka 100TS a; /archives//html/Amps/2015-12/msg00055.html (13,276 bytes)
36. Re: [Amps] 813's (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Thu, 24 Dec 2015 07:18:34 +0000; I once built a pair of 813's as a linear grounded grid amplifier driven off my pair of 6146B. Worked great, I then tried a pair of 250th in GG and they worked fine as well. I always wanted to play wi; /archives//html/Amps/2015-12/msg00058.html (14,220 bytes)
37. Re: [Amps] 813's (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Thu, 24 Dec 2015 11:18:04 -0500; Its not that 250TH's etc dont work but they need a lot more drive due to the low mu, a hefty regulated bias supply voltage wise, and arent much beyond sweep tube for linearity. Ive been sitting on a; /archives//html/Amps/2015-12/msg00059.html (16,349 bytes)
38. Re: [Amps] 813's (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Fri, 25 Dec 2015 18:17:19 -0500; I built up a pair of 813s based on the single band amps in QST or the Handbook back in the early 60s. I used a B&W 850A Tank IIRC after my infamous 6C21. I drove them with a number of rigs from the H; /archives//html/Amps/2015-12/msg00061.html (9,657 bytes)
39. Re: [Amps] 813's (score: 1): Author: "Fuqua, Bill L" <wlfuqu00@uky.edu>; Date: Fri, 25 Dec 2015 01:13:28 +0000; Except that I would probably use them grid driven, I have been thinking of doing something with my 1000T and 2000T tubes. But not put any real time on them. The 1000T is kind of strange in that it re; /archives//html/Amps/2015-12/msg00062.html (16,906 bytes)

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