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61. [Amps] Drake L7 mods. (score: 1): Author: Mark Hill <g4fph@mjha.co.uk>; Date: Sun, 03 Jun 2007 13:47:58 +0100; Folks, Have just purchased a late model Drake L7E (E for export?) as a utility amplifier for HF. As a teenager, I used to dream of being able to afford a pair of 3-500 - only taken me 30 years to get; /archives//html/Amps/2007-06/msg00010.html (7,149 bytes)
62. Re: [Amps] Drake L7 mods. (score: 1): Author: Mark Hill <g4fph@mjha.co.uk>; Date: Mon, 04 Jun 2007 09:55:12 +0100; Folks, Thanks for all the on- and off-list feedback on the L7. Seems like there is a fair number of mods. to do to make the amp. even better than stock. I may try 4-400 if they will fit in the box an; /archives//html/Amps/2007-06/msg00023.html (9,176 bytes)
63. [Amps] Drake L7E observations and question (score: 1): Author: Mark Hill <g4fph@mjha.co.uk>; Date: Thu, 21 Jun 2007 09:22:18 +0100; Folks, Well I finally took delivery of my Drake L7E yesterday. Up against my HB efforts, I'm amazed at how small the thing is, yet it makes 1kW OK, at least on 80 m. Many thanks to all those that pro; /archives//html/Amps/2007-06/msg00104.html (8,626 bytes)
64. Re: [Amps] Drake amplifier (score: 1): Author: "Mark Hill" <g4fph@mjha.co.uk>; Date: Mon, 23 Jul 2007 22:26:33 +0100; Gary, Mine does a fairly comfortable 1 kW out (with 100 W drive), with the stock Drake HV PSU (about 2.4 kV on load including the drop across the 50 Ohm 'glitch' resistor I added). Pity the designer(; /archives//html/Amps/2007-07/msg00381.html (9,185 bytes)
65. Re: [Amps] 813's shot noise? (score: 1): Author: "Mark Hill" <g4fph@mjha.co.uk>; Date: Thu, 12 Jun 2008 15:02:47 +0100; Chuck, This was one of the first mods. I did to my L7 when I got it. No unintended consequences here, either in the L7 or any other GG, triode-based amp. I have ever built. The L7-PS runs way cooler; /archives//html/Amps/2008-06/msg00097.html (11,988 bytes)
66. [Amps] Yaesu Quadra circuits wanted (score: 1): Author: "Mark Hill" <g4fph@mjha.co.uk>; Date: Thu, 16 Oct 2008 10:03:57 +0100; Folks, Does anyone have an electronic copy (or even a paper one, come to that!) of the circuits / service manual for the Yaesu VL-1000 (Quadra) amplifier? I have recently completed a PIC-based interf; /archives//html/Amps/2008-10/msg00071.html (8,110 bytes)
67. [Amps] Drake L7 Power Supply (score: 1): Author: "Mark Hill" <g4fph@mjha.co.uk>; Date: Tue, 16 Dec 2008 10:39:21 -0800; Folks, Looking at the circuit for the power supply used with the Drake L7 amplifier, the primary of the mains transformer appears to consist of four separately accessible circa 120 Volt windings. Wit; /archives//html/Amps/2008-12/msg00241.html (8,616 bytes)
68. [Amps] Yaesu Quadra power output / meter accuracy / serial port (score: 1): Author: "Mark Hill" <g4fph@mjha.co.uk>; Date: Wed, 11 Feb 2009 02:27:31 -0800; Folks, According to an external power meter, my Quadra amp seems a little shy at making its rated output on the lower HF bands. One these bands, the power meter display in the Quadra seems, however,; /archives//html/Amps/2009-02/msg00302.html (8,888 bytes)
69. [Amps] 58 and counting (score: 1): Author: "Mark Hill" <g4fph@mjha.co.uk>; Date: Mon, 24 Aug 2009 17:23:12 +0100; Crikey folks! I've received 58 mails from amps. since Saturday. Surely a result of a parasitic somewhere?! Hope Rich and Tom are OK on the outside somewhere. I miss their banter. Regards, Mark. ** Ma; /archives//html/Amps/2009-08/msg00441.html (7,128 bytes)
70. Re: [Amps] which HV connector to use? (score: 1): Author: "Mark Hill" <g4fph@mjha.co.uk>; Date: Wed, 13 Jan 2010 09:26:18 -0800; Felipe, I see there are lots of responses that mention the Millen high voltage type connector. Perhaps there are different types of these available. As to the single-pole type fitted to my Drake L7 a; /archives//html/Amps/2010-01/msg00145.html (11,756 bytes)
71. Re: [Amps] Audio/RF compression (score: 1): Author: Mark - G4FPH <g4fph@mjha.co.uk>; Date: Thu, 12 Jan 2017 21:46:49 +0000; We're very lucky in my part of UK to have access to a number of WebSDR receivers (ref. www.websdr.org) that cover the 160 and 80 metre bands that I most often use. When ragchewing on SSB, I have move; /archives//html/Amps/2017-01/msg00245.html (12,798 bytes)
72. [Amps] Another day, another even bigger LDMOS / Elecraft KPA-1500 (score: 1): Author: "Mark Hill" <g4fph@mjha.co.uk>; Date: Fri, 21 Apr 2017 09:37:35 +0100; Just when SPE decided to upgrade their 1k3 amp. to use a 1k5 transistor: http://www.richardsonrfpd.com/Pages/Product-Details.aspx?productId=1241241 So, 65 Volt looks to be the new 50 Volt, but surely; /archives//html/Amps/2017-04/msg00158.html (8,575 bytes)
73. Re: [Amps] Sunset of old technologies (score: 1): Author: "Mark Hill" <g4fph@mjha.co.uk>; Date: Fri, 21 Apr 2017 16:08:39 +0100; Cathy, Well, the Chinese have stepped in to keep supplies of some valves (tubes!) going a while longer. Surely a good thing, as would be a sin for old amps., serviceable in all other respects, to go; /archives//html/Amps/2017-04/msg00161.html (9,521 bytes)
74. Re: [Amps] Price per Watt Conversation (score: 1): Author: "Mark Hill" <g4fph@mjha.co.uk>; Date: Sun, 23 Apr 2017 09:30:46 +0100; SPE should be in a good position to follow the 'multiple devices, under run' approach. Their still current 2K-FA amplifier uses 6 pallets, each pallet having a single 300 W, MRF151G, transistor. Then; /archives//html/Amps/2017-04/msg00203.html (11,353 bytes)

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