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1. Re: [Amps] 8874? (score: 1): Author: "Adrian Rees" <rees.a@btconnect.com>; Date: Wed, 1 Jul 2009 09:23:58 +0100; Erm, the MLA2500 uses the 8875 not the 8873. Sorry for being a pedant ! I have never seen a Dentron DTR-2000 and am curious to see the circuit diagram. I must admit I do like Dentron amps, even thoug; /archives//html/Amps/2009-07/msg00001.html (11,314 bytes)
2. Re: [Amps] Enabling 10 Meters: Dentron MLA-2500 (score: 1): Author: "Adrian Rees" <rees.a@btconnect.com>; Date: Mon, 16 Mar 2009 10:33:12 -0800; "Dentrons are notorious for blowing the PS and with only 500pf for a bypass RF gets into the electrolytics and they get a bit upset." They sure do...I've just rebuilt the Power Supply of my 2500, add; /archives//html/Amps/2009-03/msg00447.html (9,711 bytes)
3. Re: [Amps] Step Start Relay (score: 1): Author: "Adrian Rees \(MW1LCR\)" <rees.a@btconnect.com>; Date: Fri, 13 Feb 2009 06:59:13 -0800; Erm, forgive me...NTC ? Adrian Adrian, Just use a NTC and you can just put it in the same cabinet. 73's, Evert PA2KW --Original Message-- From: amps-bounces@contesting.com [mailto:amps-bounces@contes; /archives//html/Amps/2009-02/msg00415.html (9,374 bytes)
4. [Amps] Step Start Relay (score: 1): Author: "Adrian Rees \(MW1LCR\)" <rees.a@btconnect.com>; Date: Fri, 13 Feb 2009 06:06:42 -0800; Hi all I am near completion of the re-build of the power supply of my Dentron ML2500 linear, and all is well. I now wish to add a Step Start facility. However, there is limited space within the case; /archives//html/Amps/2009-02/msg00413.html (8,033 bytes)
5. [Amps] GLA 1000B Parts Available (score: 1): Author: "Adrian Rees \(MW1LCR\)" <rees.a@btconnect.com>; Date: Fri, 06 Feb 2009 02:45:03 -0800; Hi all I am breaking a Dentron GLA 1000B Amp for spares. Let me know what you require off list, otherwise I'll ebay the parts. Note: Mains Power Transformer is open circuit, and the Valves (tubes) ar; /archives//html/Amps/2009-02/msg00146.html (7,211 bytes)
6. [Amps] Dentron MLA2500 Blowing Fuses (score: 1): Author: "Adrian Rees \(MW1LCR\)" <rees.a@btconnect.com>; Date: Sat, 03 Jan 2009 15:57:45 -0800; Hi all Thanks to all those who replied, on and off the list. The main power transformer is working OK, and all the voltages are correct. The insulation is good as there is no earth leakage. The main; /archives//html/Amps/2009-01/msg00016.html (7,227 bytes)
7. [Amps] Dentron MLA2500 Blowing Fuses (score: 1): Author: "Adrian Rees \(MW1LCR\)" <rees.a@btconnect.com>; Date: Mon, 29 Dec 2008 21:56:31 -0800; My long suffering Dentron MLA2500 is blowing mains power fuses (13A at 230V AC here in the UK). It really could be anything but I suspect that disconnecting the HT feed to the voltage doubler from th; /archives//html/Amps/2008-12/msg00369.html (7,633 bytes)
8. Re: [Amps] Inductor Software? (score: 1): Author: "Adrian Rees \(MW1LCR\)" <rees.a@btconnect.com>; Date: Tue, 09 Dec 2008 12:56:26 -0800; Thanks to all who replied on & off the list. I have a good collection of inductor winding & design applications. One that stands out is COIL by Brian Beezley K6STI. Just wound my first inductor using; /archives//html/Amps/2008-12/msg00176.html (7,221 bytes)
9. [Amps] Inductor Software? (score: 1): Author: "Adrian Rees \(MW1LCR\)" <rees.a@btconnect.com>; Date: Thu, 04 Dec 2008 14:34:37 -0800; Hi all Does anyone know of a piece of software that I can use to calculate / design inductors. (Specifically the gauge of conductor is the issue, as I plan on using 6 or 8 mm diameter copper pipe). T; /archives//html/Amps/2008-12/msg00093.html (7,326 bytes)
10. [Amps] Dentron MLA2500 SWR Problem (score: 1): Author: "Adrian Rees" <rees.a@btconnect.com>; Date: Tue, 12 Aug 2008 08:05:58 +0100; Hi all Just an update to my previous emails. Last night I completed the modifications suggested by the late Chris Lund. (See http://support2.overkalix.se/~sm2yer/shack/amp_mla2500/dentron_mla-2500b_c; /archives//html/Amps/2008-08/msg00062.html (8,743 bytes)
11. Re: [Amps] Dentron MLA2500 (score: 1): Author: "Adrian Rees" <rees.a@btconnect.com>; Date: Fri, 8 Aug 2008 18:46:42 +0100; Further to this, The Choke, RFC 4, on the ALC Board looks to have over heated at some point, and the windings are loose. I would like to replace this choke, but in the documents its listed as a 15MH; /archives//html/Amps/2008-08/msg00046.html (8,394 bytes)
12. [Amps] Dentron MLA2500 (score: 1): Author: "Adrian Rees" <rees.a@btconnect.com>; Date: Wed, 6 Aug 2008 22:49:00 +0100; Hi all Take a look at this PDF File from the late Kris Lund. http://hamradio.shacknet.nu/shack/amp_mla2500/dentron_mla-2500b_cooling.pdf My MLA2500 has a crazy problem on 3.5MHz. I can tune it up wit; /archives//html/Amps/2008-08/msg00044.html (6,903 bytes)
13. Re: [Amps] Dentron MLA2500 SWR Question (score: 1): Author: "Adrian Rees" <rees.a@btconnect.com>; Date: Sun, 3 Aug 2008 18:29:13 +0100; Hi all First of all thank you all for the very helpful replies, on and off list. I have the amp on the bench at the moment, the swamping resistor has been replaced, and bot the input and output socke; /archives//html/Amps/2008-08/msg00012.html (19,271 bytes)
14. Re: [Amps] Dentron MLA2500 SWR Question (score: 1): Author: "Adrian Rees" <rees.a@btconnect.com>; Date: Fri, 1 Aug 2008 22:49:05 +0100; There is a 200 Ohm Swamping Resistor in place. I replaced the original (which had been removed by the previous owner) with a 200 Ohm non inductive resistor made up of a few resistors in Series / Para; /archives//html/Amps/2008-08/msg00005.html (12,760 bytes)
15. [Amps] Dentron MLA2500 SWR Question (score: 1): Author: "Adrian Rees" <rees.a@btconnect.com>; Date: Fri, 1 Aug 2008 09:56:06 +0100; Hi all I have a Dentron MLA2500 linear, which mostly works fine, and I'm getting lots of RF out. However, on 3.5MHz (no other band) it is difficult to tune and was wondering if someone could explain; /archives//html/Amps/2008-08/msg00000.html (7,539 bytes)
16. [Amps] K2RIW / W2GN 144MHz Linear (score: 1): Author: "Adrian Rees" <rees.a@btconnect.com>; Date: Wed, 9 Jul 2008 16:03:51 +0100; Hi all I have been slowly gathering all the parts to build a 144MHz Linear based around a pair of 4CX250B valves (tubes to our US Cousins). Recently, a local amateur sold to me his collection of part; /archives//html/Amps/2008-07/msg00082.html (9,215 bytes)
17. [Amps] Transformer for GLA1000 Needed (score: 1): Author: "Adrian Rees" <rees.a@btconnect.com>; Date: Tue, 1 Apr 2008 20:06:45 +0100; Hi all I need a power transformer for a Dentron GLA1000 800 volts, 12v and 6.3v on the secondary, 220 - 240 on the Primary. I am not sure what current, but guess something like 1.2A / 800 Volts, a fe; /archives//html/Amps/2008-04/msg00019.html (7,837 bytes)
18. Re: [Amps] Blown Dentrons (score: 1): Author: "Adrian Rees (MW1LCR)" <rees.a@btconnect.com>; Date: Wed, 12 Dec 2007 20:40:56 -0000; U/S Un Servicable comes from old UK Military Workshops. Bit like the phrase "Duff" meaning broken or damaged. This one came from the CW Phrase "no Duff" meaning No DF during an exercise. Noted re Pet; /archives//html/Amps/2007-12/msg00147.html (9,423 bytes)
19. [Amps] Blown Dentrons (score: 1): Author: "Adrian Rees (MW1LCR)" <rees.a@btconnect.com>; Date: Tue, 11 Dec 2007 00:18:09 -0000; Hi all Thanks to all those who replied. Well the Transfrmer on the GLA1000B is definitely U/S. The Rectifier stack and Caps seem to be U/S in the MLA2500. I have emailed Peter Dahl, and hopefully I'l; /archives//html/Amps/2007-12/msg00133.html (7,466 bytes)
20. [Amps] Blown Dentrons.... (score: 1): Author: "Adrian Rees (MW1LCR)" <rees.a@btconnect.com>; Date: Mon, 10 Dec 2007 20:00:59 -0000; Would you believe this ! Two Blown Dentrons in a matter of weeks ! Oh well, here we go: Amp 1; Dentron ML2500 Symtoms: Blows Fuses and Household Trip Switch at switch on. Visually OK, no signs of exp; /archives//html/Amps/2007-12/msg00121.html (7,184 bytes)

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