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21. Re: [Amps] Homebrew is back.. (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Tue, 29 Mar 2011 11:23:25 -0400; I take my transmitting tube tester to hamfest and test tubes before I buy them. People have brought me tubes they have purchased to test as well. Many of the 813's that I tested not been so good. Jus; /archives//html/Amps/2011-03/msg00248.html (16,922 bytes)
22. Re: [Amps] Homebrew is back.. (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Tue, 29 Mar 2011 11:43:21 -0400; http://lists.contesting.com/mailman/listinfo/amps I thought SSB BW was limited in Canada? Besides AM can even be copied on a crystal set, that silly ESSB stuff is pretty exclusive. Carl _____________; /archives//html/Amps/2011-03/msg00249.html (9,462 bytes)
23. Re: [Amps] Homebrew is back.. (score: 1): Author: "Diane & Edward Swynar" <deswynar@xplornet.ca>; Date: Tue, 29 Mar 2011 12:01:09 -0500; Hi Carl, I believe bandwidth limitations are for audio transmissions in general, and not specific to SSB... More details surely may be found if you snoop around this Industry Canada (our FCC) website; /archives//html/Amps/2011-03/msg00250.html (11,822 bytes)
24. Re: [Amps] Homebrew is back.. (score: 1): Author: "Diane & Edward Swynar" <deswynar@xplornet.ca>; Date: Tue, 29 Mar 2011 12:09:33 -0500; Hi Carl, "...Tap the 10M coil in the center with the Tune cap which gives a 4X stepup for the required C. Do not add a seperate L coil. The last 4x 813 amp I built used the vacuum variable with the t; /archives//html/Amps/2011-03/msg00251.html (9,682 bytes)
25. Re: [Amps] Homebrew is back.. (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Tue, 29 Mar 2011 12:11:28 -0400; Also, look at the tensioning springs on top and see if they are slightly and equally compressed. If one filament strand breaks one or both will pop up. Sometimes the filament will not drop out. I hav; /archives//html/Amps/2011-03/msg00252.html (17,102 bytes)
26. Re: [Amps] Homebrew is back.. (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Tue, 29 Mar 2011 12:17:24 -0400; I have seen tantalum plate 813s made in the 60s. RCA made them if I recall. They actually had more area than say a 4-125A which has the same dissipation. It just gets a little hotter and brighter to; /archives//html/Amps/2011-03/msg00253.html (10,668 bytes)
27. Re: [Amps] Homebrew is back.. (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Tue, 29 Mar 2011 12:33:23 -0400; Hurry up and join in, there are more getting on by the day. Even a rice box or 60's controlled carrier TX into a linear does a good job when adjusted properly. On 10 to 17M even barefoot gets thru wh; /archives//html/Amps/2011-03/msg00254.html (12,474 bytes)
28. Re: [Amps] Homebrew is back.. (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Tue, 29 Mar 2011 12:50:21 -0400; Eddy, I have a couple of those NIB and havent tried them yet. My own guesstimation is that the graphite anode is around 225-250W PD in SSB service and 4 dont even show color at 2000W Input....except; /archives//html/Amps/2011-03/msg00255.html (13,151 bytes)
29. Re: [Amps] Homebrew is back.. (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Tue, 29 Mar 2011 09:52:55 -0700; I am presently running one graphite-plate (WWII vintage) 813 and one metal-plate RCA 813 in my class-C amplifier. I'm running them at about 2050v and 500 ma in CW service, and I haven't noticed any c; /archives//html/Amps/2011-03/msg00256.html (10,476 bytes)
30. Re: [Amps] Homebrew is back.. (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Tue, 29 Mar 2011 13:09:05 -0400; Youre not going to get 100% modulation with "economy" approaches much less 125% positive peaks and BC quality audio. The Gates frequency response is 30-12000 cps within 1.5dB. Carl KM1H _____________; /archives//html/Amps/2011-03/msg00257.html (19,023 bytes)
31. Re: [Amps] Homebrew is back.. (score: 1): Author: "Roger (sub1)" <sub1@rogerhalstead.com>; Date: Tue, 29 Mar 2011 13:11:53 -0400; Have you seen the prices they are going for on e-bay? <:-)) Actually there are quite a few 304TLs, 304THs, and a few 250 and 450 THs that show up from time to time. Even the 6C21 but I don't think I'; /archives//html/Amps/2011-03/msg00258.html (8,799 bytes)
32. Re: [Amps] Homebrew is back.. (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Tue, 29 Mar 2011 14:16:20 -0400; And you're talking about 5kW PEP as well not 1.5kW _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2011-03/msg00259.html (20,438 bytes)
33. Re: [Amps] Homebrew is back.. (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Tue, 29 Mar 2011 14:26:19 -0400; By the way. I do like old broadcast gear. But a beginner building from scratch on a budget can get legal power limit using a linear amplifier and low level modulation in a very compact package. That; /archives//html/Amps/2011-03/msg00260.html (20,566 bytes)
34. Re: [Amps] Homebrew is back.. (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Tue, 29 Mar 2011 15:03:44 -0400; Sane and sober folks dont buy off Ebay....we just sell there.... I bought 2 NIB Eimac 6C21's for $100 total and a dozen NOS 304TL's (Wet basement find and the boxes were history) for $10 each last ye; /archives//html/Amps/2011-03/msg00261.html (10,421 bytes)
35. Re: [Amps] Homebrew is back.. (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Tue, 29 Mar 2011 15:03:39 -0400; Youre not going to get a 375W carrier and DSB AM at 750W input. A SB-220 is PS limited to around 250W carrier for a typical transmission length. I can get the full 375W easily from my LK-500 with the; /archives//html/Amps/2011-03/msg00262.html (23,171 bytes)
36. Re: [Amps] Homebrew is back.. (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Tue, 29 Mar 2011 15:03:48 -0400; Who says it has to be run that way? Amateur grade iron sells for over $100 for just an old 100W mod transformer and there is poor low end plus no headroom for processing. Carl KM1H. _________________; /archives//html/Amps/2011-03/msg00263.html (22,840 bytes)
37. Re: [Amps] Homebrew is back.. (score: 1): Author: Jim Barber <audioguy@q.com>; Date: Tue, 29 Mar 2011 12:24:27 -0700; Having just sold most of my old iron, (there was alarming talk of a "basement singularity") I'll mention that a Flex 5000A with a good mic and an adequately-powered 8877 will make exceptional legal-l; /archives//html/Amps/2011-03/msg00264.html (8,956 bytes)
38. Re: [Amps] Homebrew is back.. (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Tue, 29 Mar 2011 15:44:48 -0400; Well, it would all make a good driver setup (-; Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2011-03/msg00265.html (9,520 bytes)
39. Re: [Amps] Homebrew is back.. (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Tue, 29 Mar 2011 17:33:40 -0500; No thanks. Ceramic tubes--boring. Nothing to see here folks--keep moving. Flex and other plastic--maybe if it breaks you can fix it but I can't. The older I get the more I want descrete components an; /archives//html/Amps/2011-03/msg00266.html (7,094 bytes)
40. Re: [Amps] Homebrew is back.. (score: 1): Author: "Roger (sub1)" <sub1@rogerhalstead.com>; Date: Tue, 29 Mar 2011 18:54:57 -0400; It looks like a great rig, but all of them I've heard so far sounded pretty bad which I attribute to the operators. 73 Roger (K8RI) _______________________________________________ Amps mailing list A; /archives//html/Amps/2011-03/msg00267.html (9,414 bytes)

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