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Total 28 documents matching your query.

1. [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)
2. Re: [Amps] Alpha 77D anode choke swap? (score: 1): Author: Vic Rosenthal <k2vco.vic@gmail.com>; Date: Tue, 10 Apr 2018 19:09:48 +0300; It SHOULD work without issues. But it wouldnt hurt to check for series resonances with the choke in place (check with GDO, power off, choke temporarily shorted). Vic 4X6GP ___________________________; /archives//html/Amps/2018-04/msg00014.html (8,286 bytes)
3. Re: [Amps] Alpha 77D anode choke swap? (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Tue, 10 Apr 2018 10:35:54 -0400; The only issue is the physical replacement. After disconnecting all connections to the existing RFC, you will need to unscrew the ceramic base from the inner chassis plate. The screw isn't directly a; /archives//html/Amps/2018-04/msg00015.html (8,886 bytes)
4. [Amps] Alpha 77D anode choke swap? (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Tue, 10 Apr 2018 09:23:38 -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 still; /archives//html/Amps/2018-04/msg00016.html (8,843 bytes)
5. 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)
6. 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)
7. Re: [Amps] Alpha 77D anode choke swap? (score: 1): Author: Alek Petkovic <vk6apk@bigpond.com>; Date: Wed, 11 Apr 2018 12:06:31 +0800; I've done a few conversions and new builds with that choke, without any problems so far. Go for it. 73, Alek. VK6APK/VK6AP About to swap the anode choke in my Alpha 77D for the Ameritron RFC in the h; /archives//html/Amps/2018-04/msg00020.html (8,944 bytes)
8. 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)
9. Re: [Amps] Alpha 77D anode choke swap? (score: 1): Author: Vic Rosenthal <k2vco.vic@gmail.com>; Date: Wed, 11 Apr 2018 08:28:21 +0300; For what its worth, Ive found with several amps that did not have a 30 meter position on the bandswitch, 30 worked best with the bandswitch set to 20 meters. I have used this choke successfully on 30; /archives//html/Amps/2018-04/msg00022.html (11,401 bytes)
10. [Amps] Alpha 77D anode choke swap? (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Thu, 12 Apr 2018 08:23:25 -0700; <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 30 MHz wi; /archives//html/Amps/2018-04/msg00024.html (11,216 bytes)
11. Re: [Amps] Alpha 77D anode choke swap? (score: 1): Author: BILL KENNAMER <k5fuv@prodigy.net>; Date: Fri, 13 Apr 2018 13:41:57 +0000 (UTC); For your Alpha 78, you might see what choke Dick Byrd uses in his Alpha 76/78 conversions. I have a 76PA that works fine on all bands. I haven't used it on 30 meters, but did try it into a dummy load; /archives//html/Amps/2018-04/msg00025.html (13,387 bytes)
12. Re: [Amps] Alpha 77D anode choke swap? (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Fri, 13 Apr 2018 07:52:23 -0700; turns around the oem choke is a new one for me, thats a good trick. Typ the best you can do is to shift an unwanted resonance up /down a bit. You dont want the 17M band resonance moving too far up..; /archives//html/Amps/2018-04/msg00026.html (16,983 bytes)
13. 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)
14. 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)
15. 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)
16. 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)
17. Re: [Amps] Alpha 77D anode choke swap? (score: 1): Author: Rob Atkinson <ranchorobbo@gmail.com>; Date: Mon, 16 Apr 2018 08:05:46 -0500; I have doubts about 50 microhenries being adequate for 80 m. Well, it might be okay if you used a tremendous amount of bypass capacitance but I'd prefer more inductance, less capacitance. A couple q; /archives//html/Amps/2018-04/msg00041.html (8,656 bytes)
18. Re: [Amps] Alpha 77D anode choke swap? (score: 1): Author: "Gary Schafer" <garyschafer@largeriver.net>; Date: Wed, 18 Apr 2018 21:38:31 -0500; With a low value choke it will parallel resonate by using some of the plate tuning capacitance. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting.com htt; /archives//html/Amps/2018-04/msg00043.html (10,165 bytes)
19. 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)
20. [Amps] Alpha 77D anode choke swap? (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Sun, 22 Apr 2018 06:40:29 -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; /archives//html/Amps/2018-04/msg00047.html (10,389 bytes)

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