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41. Re: [Amps] Measuring IMD in a home workshop (score: 1): Author: Conrad PA5Y <g0ruz@g0ruz.com>; Date: Tue, 21 May 2019 10:19:04 +0000; Hello Peter the best way of generating a clean 100W - 2 tone test is to use an ANAN SDR equipped with Pure signal. PowerSDR mRX has a 2 tone test built in. Then if you have a good SA just use that. A; /archives//html/Amps/2019-05/msg00061.html (8,374 bytes)
42. Re: [Amps] GS35B Amps Common Problem (score: 1): Author: Conrad PA5Y <g0ruz@g0ruz.com>; Date: Tue, 29 Oct 2019 20:52:52 +0000; I get blank messages from Ian on the amps reflector, does anyone else see the same? 73 Conrad PA5Y _______________________________________________ Amps mailing list Amps@contesting.com http://lists.c; /archives//html/Amps/2019-10/msg00090.html (7,687 bytes)
43. [Amps] GU78B wanted (score: 1): Author: Conrad PA5Y <g0ruz@g0ruz.com>; Date: Tue, 7 Jan 2020 10:23:27 +0000; Does anyone have a known good GU78b that they are prepared to sell? Regards Conrad PA5Y _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.c; /archives//html/Amps/2020-01/msg00008.html (6,473 bytes)
44. Re: [Amps] GU78B wanted (score: 1): Author: Conrad PA5Y <g0ruz@g0ruz.com>; Date: Wed, 8 Jan 2020 04:44:39 +0000; Hello guys I agree! The first person I asked was Alex UR4LL, I have known him a long time and he was the first person that I asked. He did not have any 73 Conrad PA5Y I concur with all that Alek has; /archives//html/Amps/2020-01/msg00012.html (9,554 bytes)
45. Re: [Amps] GM3SEK Triode and Tetrode Boards - the last few (score: 1): Author: Conrad PA5Y <g0ruz@g0ruz.com>; Date: Fri, 31 Jan 2020 07:34:55 +0000; Something went wrong with the link, there is a missing white space. It should be: http://www.ifwtech.co.uk/g3sek/boards/boardshop.htm 73 Conrad PA5Y After 20 years and almost 2500 sets of boards and; /archives//html/Amps/2020-01/msg00056.html (7,997 bytes)
46. [Amps] 3CX3000A7 on 144 MHz (score: 1): Author: Conrad PA5Y <g0ruz@g0ruz.com>; Date: Tue, 4 Feb 2020 19:35:24 +0000; I have just acquired 2 x 3CX3000A7 and I would like to put one on 2m. I have a few designs for but before I start I have 2 questions. The Heater current is 7.5V @ 51A - does anyone use a switch mode; /archives//html/Amps/2020-02/msg00018.html (7,169 bytes)
47. Re: [Amps] 3CX3000A7 on 144 MHz (score: 1): Author: Conrad PA5Y <g0ruz@g0ruz.com>; Date: Sun, 9 Feb 2020 00:46:39 +0000; Thanks everybody for the info. The reason that I mentioned a switcher was that in the Netherlands suitable heater transformers are emphatically not a dime a dozen, in fact they are as rare as rocking; /archives//html/Amps/2020-02/msg00080.html (11,175 bytes)
48. Re: [Amps] 3CX3000A7 on 144 MHz (score: 1): Author: Conrad PA5Y <g0ruz@g0ruz.com>; Date: Sun, 9 Feb 2020 00:55:40 +0000; There are several 3CX3000A7s in use on 144 MHz in EU and they are all different. They range from 1/2wl striplines or 1/2wl tube over the anode like the RX1AS GS35B design to a clone of the W6PO but w; /archives//html/Amps/2020-02/msg00081.html (9,696 bytes)
49. [Amps] 73cnc dot com (score: 1): Author: Conrad PA5Y <g0ruz@g0ruz.com>; Date: Fri, 21 Feb 2020 12:01:13 +0000; Hello all, I was hoping to buy a YC-156 adapter plate from 73cnc.com, the site is active but the email no longer works. Does anyone know if they are still in business? 73 Conrad PA5Y ________________; /archives//html/Amps/2020-02/msg00111.html (6,394 bytes)
50. [Amps] 300Hz sidebands (score: 1): Author: Conrad PA5Y <g0ruz@g0ruz.com>; Date: Sun, 23 May 2021 16:35:57 +0000; Hi all. I have several tetrode amplifiers that run from a 3PH 50Hz supply. With the advent of the FT8 I have become aware that I have 300Hz sidebands at only -50dBc, this is obviously unacceptable. T; /archives//html/Amps/2021-05/msg00047.html (7,324 bytes)
51. Re: [Amps] 300Hz sidebands (score: 1): Author: Conrad PA5Y <g0ruz@g0ruz.com>; Date: Sun, 23 May 2021 18:13:49 +0000; Well of course initially I poured scorn on the complainers. But I have an E4406B spectrum analyser. So, I got a second opinion from myself. Sadly, they were right +/- 300Hz @ -50dBc. On VHF we can ru; /archives//html/Amps/2021-05/msg00050.html (10,166 bytes)
52. Re: [Amps] 300Hz sidebands (score: 1): Author: Conrad PA5Y <g0ruz@g0ruz.com>; Date: Mon, 24 May 2021 18:09:28 +0000; Hello Geert. Yes, I did try 3 different drivers, and several amplifiers off this HT supply. The same result. TS2000 IC746 Same result. I eventually got the supply out of the rack and took the lid off; /archives//html/Amps/2021-05/msg00055.html (8,710 bytes)
53. Re: [Amps] 300Hz sidebands (score: 1): Author: Conrad PA5Y <g0ruz@g0ruz.com>; Date: Wed, 26 May 2021 08:31:58 +0000; Hello Jim, the previous owner removed the HT choke! These sidebands are as expected for a 3PH 6 pulse capacitor smoothed supply. The original choke is on its way here which will improve things by 20d; /archives//html/Amps/2021-05/msg00060.html (11,156 bytes)
54. Re: [Amps] 300Hz sidebands (score: 1): Author: Conrad PA5Y <g0ruz@g0ruz.com>; Date: Wed, 26 May 2021 16:39:11 +0000; Hello Jim, it is a grid driven tetrode in AB1, the G2 supply is shunt stabilised and from a separate single-phase transformer. I can assure you that the drive level and therefore the anode current do; /archives//html/Amps/2021-05/msg00064.html (10,658 bytes)
55. [Amps] Replacement Alpha76a bandswitch (score: 1): Author: Conrad PA5Y <g0ruz@g0ruz.com>; Date: Mon, 2 May 2022 10:16:42 +0000; On behalf of a friend in Germany. His Alpha 76a band switch is toast, where can he obtain a replacement? Many thanks Conrad PA5Y _______________________________________________ Amps mailing list Amps; /archives//html/Amps/2022-05/msg00000.html (5,992 bytes)
56. [Amps] Phase and amplitude of 2 tube amplifiers (score: 1): Author: Conrad PA5Y <g0ruz@g0ruz.com>; Date: Thu, 13 Oct 2022 12:37:10 +0000; I am going to attempt to use 2 identical monoband tube amplifiers to generate CP but before I start I have a question. The 90 deg delay for CP comes from the array orthogonal physical boom separation; /archives//html/Amps/2022-10/msg00021.html (8,265 bytes)
57. Re: [Amps] Phase and amplitude of 2 tube amplifiers (score: 1): Author: Conrad PA5Y <g0ruz@g0ruz.com>; Date: Thu, 13 Oct 2022 17:39:20 +0000; I have had some very interesting replies. However, I should clarify that I have been running CP on 144MHz EME since 2015 and with good success. I fully understand the implications of this and that th; /archives//html/Amps/2022-10/msg00023.html (10,743 bytes)
58. Re: [Amps] 8877 heater open circuit after shipping (score: 1): Author: Conrad PA5Y <g0ruz@g0ruz.com>; Date: Mon, 3 Apr 2023 12:45:30 +0000; Was this intentional or a funny accident? ' This has for many years made it imperative to handle "emergency spare" Broadcast transmitting tubes extremely genitally , without any bumping.......' 73 Co; /archives//html/Amps/2023-04/msg00012.html (9,701 bytes)

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