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1. Re: [Amps] 87 a query re align motors? (score: 1): Author: "Martin Sole" <hs0zed@gmail.com>; Date: Mon, 28 Mar 2011 10:35:01 +0700; There's quite a bit to this whole story. The amp suffered from multiple alarms over a long period of time. Current consensus is that this was due to two specific and different causes. A discharge eve; /archives//html/Amps/2011-03/msg00235.html (15,826 bytes)
2. Re: [Amps] Question about SPE 1.3K-FA amplifier (score: 1): Author: Martin Sole <hs0zed@gmail.com>; Date: Sun, 8 Nov 2015 10:21:29 +0300; A guess, not necessarily an educated one, its a single physical device but in fact a "gemini" pair with the two devices on a single die and in a single package. On 07/11/2015 06:25, Bill Turner wrote; /archives//html/Amps/2015-11/msg00020.html (8,950 bytes)
3. Re: [Amps] KAPUT 8877'S -DISPOSAL (score: 1): Author: Martin Sole <hs0zed@gmail.com>; Date: Wed, 22 Mar 2017 19:04:53 +0300; But but but... There's gold in them thar toobs! Carl I have (6) 8877s that are no good (kaput). Reading through the archives there does not appear to be any viable options for rebuilding. So.. The $6; /archives//html/Amps/2017-03/msg00144.html (9,141 bytes)
4. Re: [Amps] new amp race / antenna take-off angle (score: 1): Author: Martin Sole <hs0zed@gmail.com>; Date: Tue, 23 May 2017 15:37:39 +0300; I wonder if that 10m height limit is the maximum below which you don't need to apply for permission. There was something similar in UK I recall, think it had to do with height of property roof etc. I; /archives//html/Amps/2017-05/msg00255.html (9,622 bytes)
5. Re: [Amps] Current draw fan Alpha 77 (score: 1): Author: Martin Sole <hs0zed@gmail.com>; Date: Tue, 24 Oct 2017 07:53:58 +0300; Hello Gary, My 77D(x) has a rheostat in the blower supply. I'm not sure if that was the same for all. Since mine is an early model it also has a thermostat switch mounted on the exhaust plenum that s; /archives//html/Amps/2017-10/msg00154.html (8,983 bytes)
6. Re: [Amps] Current draw fan Alpha 77 (score: 1): Author: Martin Sole <hs0zed@gmail.com>; Date: Wed, 25 Oct 2017 07:21:58 +0300; Hi Gary, If you take a look at my 77D pictures here: http://www.hs0zed.com/gallery/ In the 77D gallery about the 6th picture. You can see the thermostat switch mounted to the side of the exhaust plen; /archives//html/Amps/2017-10/msg00156.html (13,319 bytes)
7. Re: [Amps] Current draw fan Alpha 77 (score: 1): Author: Martin Sole <hs0zed@gmail.com>; Date: Wed, 25 Oct 2017 13:31:27 +0300; Hi Gary, Definitely a later model, you have a pcb for the RF meter circuit whereas mine is just open wired around the socket and that sure is some gunk on the blower. If it were me I would first slid; /archives//html/Amps/2017-10/msg00160.html (16,385 bytes)
8. [Amps] Rotary switch terminology (score: 1): Author: Martin Sole <hs0zed@gmail.com>; Date: Mon, 27 Nov 2017 09:13:25 +0300; Looking for help on naming of switch types. In the field of rotary switches If the pole rotates between contacts in a break before make manner how would you name this? If the pole rotates in a make b; /archives//html/Amps/2017-11/msg00209.html (6,646 bytes)
9. [Amps] Series C in amp output (score: 1): Author: Martin Sole <hs0zed@gmail.com>; Date: Fri, 9 Feb 2018 17:06:25 +0700; Amps from Acom and OM, maybe some others, have a large amount of capacitance in series with the output after the power/SWR bridge. In the case of the Acom 1000 this is 6 parallel 10nF/500v disc ceram; /archives//html/Amps/2018-02/msg00005.html (6,869 bytes)
10. [Amps] Series C in amp output (Re-post) (score: 1): Author: Martin Sole <hs0zed@gmail.com>; Date: Tue, 13 Feb 2018 11:52:52 +0700; Re-posting this. Not seen any activity here the last few days. List dead? Amps from Acom and OM, maybe some others, have a large amount of capacitance in series with the output after the power/SWR br; /archives//html/Amps/2018-02/msg00012.html (7,559 bytes)
11. Re: [Amps] Series C in amp output (score: 1): Author: Martin Sole <hs0zed@gmail.com>; Date: Tue, 13 Feb 2018 12:08:02 +0700; Okay, thanks to Bill and Steve I think we can say it's just a safety measure in case of blocking cap failure. Maybe these amps don't have the traditional RFC across the output. Never did like that id; /archives//html/Amps/2018-02/msg00013.html (9,363 bytes)
12. [Amps] Alpha 77D anode choke swap? (score: 1): Author: Martin Sole <hs0zed@gmail.com>; Date: Tue, 10 Apr 2018 16:03:16 +0700; Hi, About to swap the anode choke in my Alpha 77D for the Ameritron RFC in the hope it will work on 12m without issue. Any gotchas or is it pretty much plug n play? Thanks Martin, HS0ZED ____________; /archives//html/Amps/2018-04/msg00013.html (6,374 bytes)
13. Re: [Amps] Alpha 77D anode choke swap? (score: 1): Author: Martin Sole <hs0zed@gmail.com>; Date: Wed, 11 Apr 2018 09:53:53 +0700; Thanks Vic, Here's a bit of an update. I had a change of thinking and decided the use of 12m might be more beneficial in my Alpha 78. This has a broadband input circuit that's pretty flat from 1.8 to; /archives//html/Amps/2018-04/msg00017.html (10,833 bytes)
14. Re: [Amps] Alpha 77D anode choke swap? (score: 1): Author: Martin Sole <hs0zed@gmail.com>; Date: Wed, 11 Apr 2018 11:13:11 +0700; Cheers mate, See my later post. I tried it in the 78. Not exactly trouble free :( Martin, HS0ZED Go for it. 73, Alek. VK6APK/VK6AP On 10/04/2018 5:03 PM, Martin Sole wrote: Hi, About to swap the anod; /archives//html/Amps/2018-04/msg00019.html (9,008 bytes)
15. Re: [Amps] Alpha 77D anode choke swap? (score: 1): Author: Martin Sole <hs0zed@gmail.com>; Date: Wed, 11 Apr 2018 14:35:00 +0700; Hi, An interesting point about the band switch. The "interesting moment" occurred with the band switch in the 40m position. I'd read elsewhere that that was a preferred setting but that was a differe; /archives//html/Amps/2018-04/msg00021.html (12,872 bytes)
16. Re: [Amps] Alpha 77D anode choke swap? (score: 1): Author: Martin Sole <hs0zed@gmail.com>; Date: Sun, 15 Apr 2018 12:30:49 +0700; Thanks for all the very useful replies guys, lots of stuff to mull over and check out before making the next (mis)step :) @ VE7RF. Jim you mention the L4B as working FB 80-10 and no problem on 17+12.; /archives//html/Amps/2018-04/msg00031.html (16,977 bytes)
17. Re: [Amps] Alpha 77D anode choke swap? (score: 1): Author: Martin Sole <hs0zed@gmail.com>; Date: Mon, 16 Apr 2018 14:22:28 +0700; I've just done the W8JI test on the repaired choke. I made a quick Youtube video showing the results. You can see it at : https://www.youtube.com/watch?v=AilAblhxXSw Certainly out on the bench I woul; /archives//html/Amps/2018-04/msg00036.html (17,550 bytes)
18. Re: [Amps] Alpha 77D anode choke swap? (score: 1): Author: Martin Sole <hs0zed@gmail.com>; Date: Tue, 17 Apr 2018 17:00:47 +0700; Bill, You comment about the unconnected turns got me thinking and Jim commented on this as well. So I wrapped 3 turns of insulated solid wire, taken from some CAT5 twisting the ends together so it's; /archives//html/Amps/2018-04/msg00038.html (15,107 bytes)
19. Re: [Amps] Alpha 77D anode choke swap? (score: 1): Author: Martin Sole <hs0zed@gmail.com>; Date: Wed, 18 Apr 2018 15:43:50 +0700; AT the risk of feeling like I'm talking to myself ;) here's an update. With the applied shorted link (gimmick) winding at the top of the plate choke there have been no issues. There's also no output; /archives//html/Amps/2018-04/msg00039.html (16,407 bytes)
20. Re: [Amps] Alpha 77D anode choke swap? (score: 1): Author: Martin Sole <hs0zed@gmail.com>; Date: Fri, 20 Apr 2018 15:54:46 +0700; It took some searching but I found the below which I think is worth posting here in case anyone else gets the idea to try putting the Alpha 78 on 12m. Undoubtedly it can be done and given the way tha; /archives//html/Amps/2018-04/msg00045.html (15,455 bytes)

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