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References: [ +from:Randy.Randall@UCHealth.com: 61 ]

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41. Re: [Amps] Has this SMPS got too much ripple for a SS bias supply? (score: 1): Author: "Randall, Randy" <Randy.Randall@uchealth.com>; Date: Wed, 2 Oct 2013 17:43:38 +0000; Did you take that measurement loaded @ 3A or no load? Randy AB9GO Please note: Upcoming Vacation: December 21 - January 5, 2014 Randy E. Randall AB9GO Network Architect UC Health Randy.Randall@UCHeal; /archives//html/Amps/2013-10/msg00008.html (9,817 bytes)
42. Re: [Amps] 3CX800A7 Spares - cook them periodically? (score: 1): Author: "Randall, Randy" <Randy.Randall@UCHealth.com>; Date: Wed, 16 Jul 2014 17:49:43 +0000; "Warranty requires that they be stored with external ion pumps energized at least every 60 days." What is an external ion pump? Thank you, Randy Randy E. Randall AB9GO Network Architect UC Health Ran; /archives//html/Amps/2014-07/msg00050.html (11,250 bytes)
43. Re: [Amps] Amp Supply LK-500ZB Power Switch (score: 1): Author: "Randall, Randy" <Randy.Randall@UCHealth.com>; Date: Mon, 23 Feb 2015 22:00:27 +0000; Please CC me on this info if you find a source. I do not need one currently, but if they are available one or two on the shelf would be nice to have. Thanks, Randy AB9GO If anyone knows where i could; /archives//html/Amps/2015-02/msg00126.html (9,043 bytes)
44. [Amps] Schematic wanted for TEN TEC 9420 power supply (score: 1): Author: "Randall, Randy" <Randy.Randall@UCHealth.com>; Date: Fri, 14 Aug 2015 15:21:30 +0000; Hello all, I just picked up a Ten-Tec 420 Hercules II amp this past weekend with an Astron RM-70 power supply. Since the overload protection is in the Ten-Tec power supply I would like to see what sc; /archives//html/Amps/2015-08/msg00044.html (7,962 bytes)
45. Re: [Amps] Schematic wanted for TEN TEC 9420 power supply (score: 1): Author: "Randall, Randy" <Randy.Randall@UCHealth.com>; Date: Fri, 14 Aug 2015 15:25:51 +0000; Hello all, I just picked up a Ten-Tec 420 Hercules II amp this past weekend with an Astron RM-70 power supply. Since the overload protection is in the Ten-Tec power supply I would like to see what sc; /archives//html/Amps/2015-08/msg00045.html (9,036 bytes)
46. [Amps] Thinking out loud 3-500Z and the like gettering with RF? (score: 1): Author: "Randall, Randy" <Randy.Randall@UCHealth.com>; Date: Fri, 10 Jun 2016 19:53:04 +0000; Thinking out loud 3-500Z and the like gettering with RF? I have seen on Ebay and Alibaba small to medium RF induction heating boards for sale for not a whole lot of $$. Has anyone tried to use one of; /archives//html/Amps/2016-06/msg00027.html (8,170 bytes)
47. Re: [Amps] 8877 filament. (score: 1): Author: "Randall, Randy" <Randy.Randall@UCHealth.com>; Date: Thu, 4 May 2017 18:46:44 +0000; That scheme was tried in TV's and consumer radios in the 60's and 70's and called an instant on feature. The series string filaments were run through a diode when the set was "off" and the diode shor; /archives//html/Amps/2017-05/msg00055.html (8,528 bytes)
48. Re: [Amps] Stripping Litz (score: 1): Author: "Randall, Randy" <Randy.Randall@UCHealth.com>; Date: Wed, 17 May 2017 12:51:00 +0000; A hot solder pot and rosin flux has worked for me every time. Dip wire in flux, dip wire end in the pot and wait 20 seconds. One of the little Chinese pots that sell for $15.00 works fine. For the la; /archives//html/Amps/2017-05/msg00166.html (29,953 bytes)
49. Re: [Amps] Pole pigs removed from oil ?? (score: 1): Author: "Randall, Randy" <Randy.Randall@UCHealth.com>; Date: Mon, 6 Nov 2017 14:12:44 +0000; 1.9 Gal of PCB oil. Yikes! I used a pair of these (see below) in series and a GE pole pig on a 4-1000A home brew amp in 1970. PCB galore ! ! ! https://www.recycledgoods.com/general-electric-pyranol-c; /archives//html/Amps/2017-11/msg00027.html (15,661 bytes)
50. Re: [Amps] Amplifier for 630 meter band (score: 1): Author: "Randall, Randy" <Randy.Randall@UCHealth.com>; Date: Fri, 10 Nov 2017 18:14:06 +0000; See if you can find an RF generator from a MRI machine. The basics are there and you can as suggested in this thread outboard the input network and the output network in an external enclosure. I have; /archives//html/Amps/2017-11/msg00099.html (11,138 bytes)
51. Re: [Amps] MFJ products (score: 1): Author: "Randall, Randy" <Randy.Randall@UCHealth.com>; Date: Thu, 7 Dec 2017 14:08:24 +0000; Some linear Astrons came with over voltage protection built in. I can't remember what models that did though. Get a schematic for your particular model and pay attention to the production dates as th; /archives//html/Amps/2017-12/msg00051.html (13,341 bytes)
52. Re: [Amps] Non metallic paint for plywood ? (score: 1): Author: "Randall, Randy" <Randy.Randall@UCHealth.com>; Date: Wed, 23 Oct 2019 13:34:16 +0000; I would use a water thin coating of spar varnish or glyptal (sp) to seal the wood. Randy AB9GO **WARNING: This email originated from outside of UC Health. ** DO NOT CLICK links or open attachments un; /archives//html/Amps/2019-10/msg00064.html (10,424 bytes)
53. Re: [Amps] Fwd: Source of 811A or 572B tubes? (score: 1): Author: "Randall, Randy" <Randy.Randall@UCHealth.com>; Date: Tue, 29 Dec 2020 19:03:57 +0000; **WARNING: This email originated outside of UC Health** DO NOT CLICK links or open attachments unless you recognize the sender and know the content is safe. Lou, Have you tried RF Parts, SND Tubes(W; /archives//html/Amps/2020-12/msg00075.html (11,836 bytes)
54. Re: [Amps] DX-100B CW Keying (score: 1): Author: "Randall, Randy" <Randy.Randall@UCHealth.com>; Date: Wed, 5 Jan 2022 18:10:03 +0000; That explains why so many DX-100's have that mod. I knew it was a popular mod but I never realized it was specifically sold as a mod kit from Heath. Now I know. Randy.ab9go@gmail.com **WARNING: This; /archives//html/Amps/2022-01/msg00029.html (11,730 bytes)
55. Re: [Amps] RJ1A + clones, reliability ? (score: 1): Author: "Randall, Randy" <Randy.Randall@UCHealth.com>; Date: Thu, 10 Mar 2022 15:19:23 +0000; The photo on the Henry radio website does not instill confidence as the metal casing looks unrefined and bumpy. One interesting item is that Henry sells replacement coil assemblies for the HVC-1. Is; /archives//html/Amps/2022-03/msg00020.html (8,682 bytes)
56. Re: [Amps] Western Electric (score: 1): Author: "Randall, Randy" <Randy.Randall@UCHealth.com>; Date: Wed, 23 Mar 2022 19:31:13 +0000; 572B's but you would not be able to afford them...... Randy AB9GO **WARNING: This email originated outside of UC Health** DO NOT CLICK links or open attachments unless you recognize the sender and kn; /archives//html/Amps/2022-03/msg00059.html (9,770 bytes)
57. [Amps] EICO amp was RE: Western Electric (score: 1): Author: "Randall, Randy" <Randy.Randall@UCHealth.com>; Date: Thu, 24 Mar 2022 19:51:05 +0000; I have one of these. A real odd duck with push pull parallel EL84's. I need to recap it. Maybe someday I'll run across and 2nd unit for a stereo pair. I like good quality sound, but I can't see the a; /archives//html/Amps/2022-03/msg00073.html (9,252 bytes)
58. Re: [Amps] Measuring fil V (score: 1): Author: "Randall, Randy" <Randy.Randall@UCHealth.com>; Date: Tue, 7 Jun 2022 19:02:49 +0000; Possible stupid question alert. Why not measure filament current instead of voltage? Then you do not have to worry about accounting for losses in the filament path or the position of the voltmeter co; /archives//html/Amps/2022-06/msg00072.html (9,203 bytes)
59. Re: [Amps] Plate transformer rewind (score: 1): Author: "Randall, Randy" <Randy.Randall@UCHealth.com>; Date: Thu, 9 Nov 2023 18:24:24 +0000; Try Foster Transformer Company 3820 Colerain Ave Cincinnati, OH 45223-2571 TF: 800-963-9799 PH: 513-681-2420 Fax: 513-681-2424 They were the supplier to Drake for a number of years. Randy E. Randall; /archives//html/Amps/2023-11/msg00012.html (10,247 bytes)
60. Re: [Amps] Foster Transformer Company (score: 1): Author: "Randall, Randy" <Randy.Randall@UCHealth.com>; Date: Fri, 10 Nov 2023 14:16:26 +0000; I did not know that was a former Crosley property. That is a few miles south from the old factory @ 1329-1333 Arlington St. This is one of those historical facts that will be lost to time someday. It; /archives//html/Amps/2023-11/msg00014.html (9,279 bytes)

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