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1. [Amps] HB amps (score: 1): Author: "carl s." <carlseye@tampabay.rr.com>; Date: Thu, 2 Mar 2006 19:47:37 -0500; Am I out of the logic loop when considering a pair of 813's for an amp?? I know there are a lot of "fancy, new " tubes out there, but can they compete with the "old stuff" in the 1 KW class , insofar; /archives//html/Amps/2006-03/msg00027.html (6,444 bytes)
2. Re: [Amps] HB amps (score: 1): Author: "k7fm" <k7fm@teleport.com>; Date: Thu, 2 Mar 2006 18:53:00 -0800; Hi Carl: I operated 3 x 813s in an amp for a number of years and worked about 250 countries on 75 meter phone. The power output only measured about 600 watts. My high voltage was lower than it could; /archives//html/Amps/2006-03/msg00028.html (7,571 bytes)
3. Re: [Amps] HB amps (score: 1): Author: Chris Howard <chris@yipyap.com>; Date: Thu, 02 Mar 2006 20:57:14 -0700; A viewing window is nice. Chris w0ep _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-03/msg00029.html (6,825 bytes)
4. Re: [Amps] HB amps (score: 1): Author: Bill Turner <dezrat@copper.net>; Date: Thu, 02 Mar 2006 21:24:00 -0800; ORIGINAL MESSAGE: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ If you take away the nostalgia factor, there are better tubes available, IMO. For about the price of a pair of 813s you can get a s; /archives//html/Amps/2006-03/msg00032.html (7,591 bytes)
5. Re: [Amps] HB amps (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Fri, 3 Mar 2006 07:29:50 +0000; An 813 only has 125W dissipation, so by today's standards they are small tubes. You'd need four to equal a single 3-500Z, which will glow just as nicely. A pair would be struggling to reach even the; /archives//html/Amps/2006-03/msg00033.html (8,354 bytes)
6. Re: [Amps] HB Amps (score: 1): Author: john.brewer@us.schneider-electric.com; Date: Fri, 3 Mar 2006 11:52:59 -0500; NOS 813 can be bought on ebay/hamfests for about $20-$30 each. I'd love to find some new 3-500Zs for $50!! John K5MO _______________________________________________ Amps mailing list Amps@contesting; /archives//html/Amps/2006-03/msg00037.html (7,079 bytes)
7. Re: [Amps] HB Amps (score: 1): Author: Chris Howard <chris@yipyap.com>; Date: Fri, 03 Mar 2006 10:30:55 -0700; That's kind of my trouble... When thinking about building a legal-limit single tube amp, I get the same feeling as when I watch the wordworking program on television and see the guy rip-saw through a; /archives//html/Amps/2006-03/msg00039.html (8,269 bytes)
8. Re: [Amps] HB Amps (score: 1): Author: Tony King - W4ZT <amps080605@w4zt.com>; Date: Fri, 03 Mar 2006 12:36:39 -0500; That's a valid concern... Get yourself a GS-35B and build a good legal limit amp with a $100 tube that glows in the dark! 73, Tony W4ZT _______________________________________________ Amps mailing li; /archives//html/Amps/2006-03/msg00040.html (7,747 bytes)
9. Re: [Amps] HB amps (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Fri, 3 Mar 2006 14:32:26 -0500; A pair of 813's will easily produce 600 watts output and do it for years and years. They are very rugged tubes. I have an amp with a pair of them that I built in the mid 60's and it still has the sa; /archives//html/Amps/2006-03/msg00042.html (10,611 bytes)
10. Re: [Amps] HB Amps (score: 1): Author: "Larry Carman" <lncarman@swbell.net>; Date: Fri, 3 Mar 2006 13:44:44 -0600; The first amp I built was in about 1980 and used a pair of 6KD6 tubes pulled from TV sets. I also used the transformer out of an old TV set. The pair of 6KD6 tubes would do 200 watts output on 10 thr; /archives//html/Amps/2006-03/msg00043.html (9,204 bytes)
11. Re: [Amps] HB amps (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Fri, 3 Mar 2006 19:44:35 +0000; I don't dispute the raw output figures, or the ruggedness either; but you didn't address my point about "clean, linear output". How do the IMD levels at 600W output compare with a 3-500Z? -- 73 from; /archives//html/Amps/2006-03/msg00044.html (9,264 bytes)
12. Re: [Amps] HB amps (score: 1): Author: Mike Bondarev <mikebond@tochka.ru>; Date: Fri, 3 Mar 2006 21:36:17 +0000; Hi Gary! Is it GG or GC ? Regards, Mike RL3BM _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-03/msg00046.html (8,864 bytes)
13. Re: [Amps] HB amps (score: 1): Author: "Will Matney" <craxd1@verizon.net>; Date: Fri, 03 Mar 2006 16:43:11 -0500; My guess G-G for 600. I was thinking myself of building one of these with 813's since they're still making them. Shugang Tubes in China is making them and the 811 I believe. I have a design I had sta; /archives//html/Amps/2006-03/msg00047.html (9,607 bytes)
14. Re: [Amps] HB amps (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Fri, 3 Mar 2006 17:36:41 -0500; It is GG. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-03/msg00048.html (9,867 bytes)
15. Re: [Amps] HB amps (score: 1): Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>; Date: Fri, 03 Mar 2006 17:39:20 -0500; I don't think plate dissipation is the what limits the 813, but emission. A pair of carbon plate 813's have much more surface area than a single 3-500. It takes a lot to make them glow. Their plate d; /archives//html/Amps/2006-03/msg00049.html (10,334 bytes)
16. Re: [Amps] HB amps (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Fri, 3 Mar 2006 17:39:39 -0500; It has been many years since I looked at the IMD on them but remember that it was not real terrible. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.c; /archives//html/Amps/2006-03/msg00050.html (10,660 bytes)
17. Re: [Amps] HB Amps (score: 1): Author: R@contesting.com;Measures <r@somis.org>; Date: Fri, 3 Mar 2006 18:29:38 -0800; A common danger with the 8877 is failure to realize that HF operation is the most hazardous situation. The gotcha is that at its F-max, there's c. 5500-ohms of XC in the anode-cathode feedback path.; /archives//html/Amps/2006-03/msg00055.html (9,485 bytes)
18. Re: [Amps] HB Amps (score: 1): Author: Bill Turner <dezrat@copper.net>; Date: Fri, 03 Mar 2006 21:09:12 -0800; ORIGINAL MESSAGE: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 8877s are pricey, but you can get essentially the same performance from a single GS-35b for about $120 including shipping. It requi; /archives//html/Amps/2006-03/msg00056.html (8,360 bytes)
19. Re: [Amps] HB amps (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Sat, 4 Mar 2006 12:36:27 +0100 (CET); I don't think I'd go for just 2 - 3 or 4 is likely a better bet. A pair of them are rated for about 2400watts PEP output in plate and screen modulated AM, so provided they still have emission, runnin; /archives//html/Amps/2006-03/msg00060.html (9,226 bytes)
20. Re: [Amps] HB Amps (score: 1): Author: Bill Turner <dezrat@copper.net>; Date: Sat, 04 Mar 2006 09:03:28 -0800; ORIGINAL MESSAGE: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ I was referring to the price of new, not NOS. A pair of brand new 813s will be less than a brand new 3-500Z by perhaps $50 more or; /archives//html/Amps/2006-03/msg00066.html (8,505 bytes)

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