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41. Re: [Amps] switching power supply for tube amplifier (score: 1): Author: "Roger" <sub1@rogerhalstead.com>; Date: Fri, 14 Sep 2007 19:56:25 -0400; My finals are External anode (ceramic/metal) If they start to glow I'm in expensive and deep "doggie do"<:-)) Today you can get a pair of transistors that will conservatively run the legal limit out; /archives//html/Amps/2007-09/msg00160.html (10,364 bytes)
42. Re: [Amps] switching power supply for tube amplifier (score: 1): Author: "Roger" <sub1@rogerhalstead.com>; Date: Fri, 14 Sep 2007 20:10:39 -0400; Sho Nuff...I built a modified version way back then. It used a band switching B&W PI network. Worked like a champ. OTOH I didn't have the big meter rackin mine It looked a lot neater than my origina; /archives//html/Amps/2007-09/msg00161.html (9,673 bytes)
43. Re: [Amps] Wanted: 3-500z amp plans (score: 1): Author: "Roger" <sub1@rogerhalstead.com>; Date: Tue, 18 Sep 2007 03:35:45 -0400; Too bad the 4CX-1600B is no longer available. I had planned on getting one of the Alpha 6-mneter amps, then I thought of building one myself. At one time I had 4 4CX1500s. Kinda wish I had them back; /archives//html/Amps/2007-09/msg00184.html (7,333 bytes)
44. [Amps] Conversions (score: 1): Author: "Roger Halstead" <sub1@rogerhalstead.com>; Date: Tue, 25 Sep 2007 22:19:51 -0400; With all this talk of conversions, I'd think the old Alpha 76 series would be ideal. The tubes are rated for well above 50 MHz, they are easy to drive, and 76As are going for less than the price for; /archives//html/Amps/2007-09/msg00313.html (8,855 bytes)
45. Re: [Amps] New SB-200 owner (score: 1): Author: "Roger Halstead" <sub1@rogerhalstead.com>; Date: Wed, 26 Sep 2007 20:13:32 -0400; Welcome and don't let the current signal to noise...er... high noise to signal ratio discourage you. Like any newsgroup/reflector I've seen, on occasion a topic will arise that raises a bit of confl; /archives//html/Amps/2007-09/msg00346.html (9,617 bytes)
46. Re: [Amps] Posting here (score: 1): Author: "Roger Halstead" <sub1@rogerhalstead.com>; Date: Wed, 26 Sep 2007 23:38:59 -0400; I know this is OT, but relevant. I didn't realize any one was still posting using the "digest" form. Those and headers with no subject never make it past my ISP so it doesn't cost me any download tim; /archives//html/Amps/2007-09/msg00357.html (7,845 bytes)
47. Re: [Amps] Amplifier Linearity (score: 1): Author: "Roger Halstead" <sub1@rogerhalstead.com>; Date: Thu, 27 Sep 2007 03:35:18 -0400; I thought that was what Class C was all about? <:-)) 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinf; /archives//html/Amps/2007-09/msg00368.html (8,986 bytes)
48. Re: [Amps] New SB-200 owner (score: 1): Author: "Roger Halstead" <sub1@rogerhalstead.com>; Date: Thu, 27 Sep 2007 03:29:18 -0400; I wonder about going the 4CX-250 route, or 4-250. Apparently my Eimac hand book is out in the shop so I can't look up the numbers for the 125, 250 and 400, but I do have a commercial 2-meter amp usi; /archives//html/Amps/2007-09/msg00369.html (11,798 bytes)
49. Re: [Amps] New SB-200 owner (score: 1): Author: "Roger Halstead" <sub1@rogerhalstead.com>; Date: Thu, 27 Sep 2007 03:43:08 -0400; This didn't make it through before, or at least several posts did afterwards so I stripped it down to try again. I wonder about going the 4CX-250 route, or 4-250. Apparently my Eimac hand book is out; /archives//html/Amps/2007-09/msg00370.html (10,060 bytes)
50. Re: [Amps] New SB-200 owner (score: 1): Author: "Roger Halstead" <sub1@rogerhalstead.com>; Date: Thu, 27 Sep 2007 03:33:59 -0400; Brings back memories of the "good old days" <LOL> Said in rythm..."CQ...CQ...CQ, No lids, no kids, no space cadets... " and I've forgotten the rest of the mantra. 73 Roger (K8RI) ___________________; /archives//html/Amps/2007-09/msg00371.html (8,570 bytes)
51. Re: [Amps] New SB-200 owner (score: 1): Author: "Roger Halstead" <sub1@rogerhalstead.com>; Date: Thu, 27 Sep 2007 09:59:15 -0400; Probably not overall, but I like to keep the harmonics down in the design as much as possible. The filters would probably do as good a job. Considering I'm close to a lot of homes using off the air; /archives//html/Amps/2007-09/msg00400.html (9,974 bytes)
52. Re: [Amps] New SB-200 owner (score: 1): Author: "Roger Halstead" <sub1@rogerhalstead.com>; Date: Thu, 27 Sep 2007 12:38:12 -0400; Gain? GG? I'd probably use them grid driven. The whole post was a question was a question as to whether any or all of these tubes would work, or be suitable, not a recomendation. Collins sure liked; /archives//html/Amps/2007-09/msg00416.html (13,084 bytes)
53. Re: [Amps] Amps During Working Hours (score: 1): Author: "Roger Halstead" <sub1@rogerhalstead.com>; Date: Thu, 27 Sep 2007 17:21:36 -0400; You must work in IT? <:-)) 73 Roger (K8RI) (Past sys admin, Developmental analyst, and Project Manager--Now retired andloving it.) _______________________________________________ Amps mailing list A; /archives//html/Amps/2007-09/msg00429.html (8,298 bytes)
54. [Amps] The HT-33B and swamped grid (score: 1): Author: "Roger Halstead" <sub1@rogerhalstead.com>; Date: Fri, 28 Sep 2007 01:47:26 -0400; The comments about the swamped grid got me to thinking about the Hallicrafters HT-33B which uses a Beam Powered Pentode (PL-172/8295A witht he straight 8295A being ceramic and metal.) I've had severa; /archives//html/Amps/2007-09/msg00448.html (7,859 bytes)
55. Re: [Amps] The HT-33B and swamped grid (score: 1): Author: "Roger Halstead" <sub1@rogerhalstead.com>; Date: Fri, 28 Sep 2007 11:58:05 -0400; The 8295A is much larger than the 8877 although it only has 1000 watts plate dissapation compared to the 1500 for the 8877. OTOH the fins are coarse with lots of space so the tuve is easily cooled w; /archives//html/Amps/2007-09/msg00464.html (10,525 bytes)
56. Re: [Amps] The HT-33B and swamped grid (score: 1): Author: "Roger Halstead" <sub1@rogerhalstead.com>; Date: Fri, 28 Sep 2007 13:01:13 -0400; Fortunately, mine has a good PL-172 in it and I picked up some used 8295As in the hope they might be good. After testing it appears I have a good supply of spares. 73 Roger (K8RI) __________________; /archives//html/Amps/2007-09/msg00469.html (6,950 bytes)
57. Re: [Amps] EIMAC APP NOTES, COMPLETE (score: 1): Author: "Roger Halstead" <sub1@rogerhalstead.com>; Date: Sun, 7 Oct 2007 03:21:32 -0400; Don't know what year they were $200 retail. In 78 or 79 I was paying $305 at a discount. 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://l; /archives//html/Amps/2007-10/msg00068.html (10,164 bytes)
58. Re: [Amps] CB etc Amps (score: 1): Author: "Roger" <sub1@rogerhalstead.com>; Date: Wed, 10 Oct 2007 17:42:23 -0400; I'd like to build a solid state amp capable of running the legal limit plus a wide safety margin with the HV (50 and 100) FETs available today, but the price of mistakes is a bit steep<:-)) Then the; /archives//html/Amps/2007-10/msg00112.html (8,798 bytes)
59. Re: [Amps] CB etc Amps (score: 1): Author: "Roger" <sub1@rogerhalstead.com>; Date: Wed, 10 Oct 2007 19:45:58 -0400; Tru, but so can my 1.5K if I put a matching network behind it which of course the 2K4 has built in. But...but...but...whay would any one do something so terrible to our bands. <:-)) That's like me t; /archives//html/Amps/2007-10/msg00116.html (9,353 bytes)
60. Re: [Amps] SB-230 Amp Retrofit (score: 1): Author: "Roger" <sub1@rogerhalstead.com>; Date: Fri, 12 Oct 2007 14:09:51 -0400; Depends on what you mean by affordable. With major surgery you could change to a 3CX800. Although readily available they aren't exactly cheap either. 73 Roger (K8RI) ________________________________; /archives//html/Amps/2007-10/msg00163.html (6,986 bytes)

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