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1. [Amps] Relay recommendation for Alpha 76 ? (score: 1): Author: Steve London <n2icarrl@gmail.com>; Date: Wed, 12 Aug 2009 07:55:42 -0600; Anyone have a favorite replacement T/R relay for an Alpha 76 ? I'm not interested in going with a vacuum relay. Something that is currently available from the Mouser or DigiKey catalog would be just; /archives//html/Amps/2009-08/msg00282.html (6,593 bytes)
2. [Amps] TL-922A HV Transformer (score: 1): Author: Steve London <n2icarrl@gmail.com>; Date: Sun, 17 Apr 2011 06:38:03 -0600; I recently sold a TL-922A, and per the buyers request, shipped the transformer separately. Unfortunately, the USPS lost the HV transformer, and I'm now looking at options for a replacement. Anyone ha; /archives//html/Amps/2011-04/msg00467.html (6,994 bytes)
3. [Amps] Alpha 76 Hypersil HV question (score: 1): Author: Steve London <n2icarrl@gmail.com>; Date: Sun, 05 Feb 2012 12:02:09 -0700; I have two Alpha 76's, both 3-tubers. One has the standard transformer, the other hypersil. Compared to the standard transformer 76, the HV on the hypersil 76 seems low - About 2150-2200 volts in sta; /archives//html/Amps/2012-02/msg00024.html (7,193 bytes)
4. Re: [Amps] push pull or parallel ? (score: 1): Author: Steve London <n2icarrl@gmail.com>; Date: Mon, 26 Jan 2015 08:50:55 -0700; 160mtrs contest past and we need more power... Plan is to add 3 dB by throwing in another tube (2.5kw anode dissipation Tetrode, grid driven). I could go for push-pull of just parallel the tube's. I; /archives//html/Amps/2015-01/msg00298.html (7,193 bytes)
5. Re: [Amps] I'm not kidding: TL922 (score: 1): Author: Steve London <n2icarrl@gmail.com>; Date: Fri, 06 Feb 2015 12:48:58 -0700; When I was a kid, a local department store had some kind of ultrasonic alarm system that drove me nuts. I used to also be able to hear the 15 kHz sound from TV sweep oscillators. One of the advantage; /archives//html/Amps/2015-02/msg00079.html (9,456 bytes)
6. [Amps] Alpha 76 input circuit ? (score: 1): Author: Steve London <n2icarrl@gmail.com>; Date: Mon, 06 Apr 2015 08:43:36 -0600; I have recently converted an Alpha 76 to a pair of RFConcepts (Alpha) 3CX800A7LG's . It is a little difficult to drive, taking every bit of 100 watts input for 1500 watts output on the high bands. I; /archives//html/Amps/2015-04/msg00045.html (7,512 bytes)
7. [Amps] SB-220 6 meter input network (score: 1): Author: Steve London <n2icarrl@gmail.com>; Date: Tue, 07 Jul 2015 07:21:14 -0600; I am converting a previously-modified SB-220 to a 6 meter-only amp. The original input pi-network is long gone. Most of the articles on conversion say stuff like "remove N turns from the original 10; /archives//html/Amps/2015-07/msg00016.html (6,743 bytes)
8. Re: [Amps] Amps Digest, Vol 151, Issue 6 (score: 1): Author: Steve London <n2icarrl@gmail.com>; Date: Wed, 08 Jul 2015 19:44:56 -0600; Thanks everyone for the responses, both on the reflector and direct. Is there any particular reason the L-C-L T-match is better or worse than the more standard C-L-C pi network in this application ?; /archives//html/Amps/2015-07/msg00020.html (8,671 bytes)
9. [Amps] SB-220 6 meter conversion parasites (score: 1): Author: Steve London <n2icarrl@gmail.com>; Date: Thu, 16 Jul 2015 14:38:15 -0600; Finished the SB-220 6 meter conversion, but it seems to have major parasitic oscillations. A little background - I basically followed the 2008 QST article, except I have the original relay in it. I d; /archives//html/Amps/2015-07/msg00048.html (7,528 bytes)
10. Re: [Amps] SB-220 6 meter conversion parasites (score: 1): Author: Steve London <n2icarrl@gmail.com>; Date: Sun, 19 Jul 2015 11:03:01 -0600; First, I want to thank everyone for their comments and suggestions, which were mostly sent privately. They were very helpful. The parasites/self-oscillation is fixed. That simply involved changing th; /archives//html/Amps/2015-07/msg00060.html (9,448 bytes)
11. Re: [Amps] Decline of homebrewing? (score: 1): Author: Steve London <n2icarrl@gmail.com>; Date: Sat, 07 Jan 2017 09:02:37 -0700; Excellent advice, Jim. I was nearly killed at age 15. Thank goodness the mic cord/HV ground return broke when I jerked backwards. The muscle contraction kept me from letting go of the D-104. I still; /archives//html/Amps/2017-01/msg00148.html (14,223 bytes)
12. [Amps] Alpha 76 160 meter 2nd harmonic (score: 1): Author: Steve London <n2icarrl@gmail.com>; Date: Sun, 29 Jan 2017 08:32:19 -0700; I was surprised to receive e-mail that the 2nd harmonic of my 1866.5 signal was QRMing a QSO on 3733. I know that 160 meters was added to the Alpha 76 as an afterthought when the FCC raised the 160 m; /archives//html/Amps/2017-01/msg00296.html (6,934 bytes)
13. Re: [Amps] Maintenance-free (score: 1): Author: Steve London <n2icarrl@gmail.com>; Date: Mon, 27 Feb 2017 11:02:06 -0700; On 02/27/2017 10:55 AM, Jim Brown wrote: Yes, the control circuitry is quite complex, and I wouldn't want to work on it. But that control circuitry can prevent a lot of damage, and can make tubes las; /archives//html/Amps/2017-02/msg00212.html (7,987 bytes)
14. Re: [Amps] Tubes, transistors, and 'abuse' (score: 1): Author: Steve London <n2icarrl@gmail.com>; Date: Mon, 24 Apr 2017 10:54:55 -0600; Manfred, Can you explain what this design is trying to achieve with separate transformers for the output (T1) and for supplying DC (T2) ? Why not the more traditional center-tapped transformer that a; /archives//html/Amps/2017-04/msg00251.html (11,813 bytes)
15. Re: [Amps] Tubes, transistors, and 'abuse' (score: 1): Author: Steve London <n2icarrl@gmail.com>; Date: Mon, 24 Apr 2017 13:07:42 -0600; It would also be interesting to get Manfred's views on the Hardrock 50: https://docs.google.com/viewer?a=v&pid=sites&srcid=ZGVmYXVsdGRvbWFpbnxoYXJkcm9jazUwYmV0YXxneDoxOGMwZTJiMDIzYjZmOWE This one use; /archives//html/Amps/2017-04/msg00252.html (12,594 bytes)
16. Re: [Amps] RF2K+ LDMOS linear (score: 1): Author: Steve London <n2icarrl@gmail.com>; Date: Sun, 04 Jun 2017 07:58:54 -0600; I would not declare tube amplifiers dead until a legal limit, SS amplifier repeatedly proves itself in serious contest conditions. I'm not talking about the guy who casually makes 500 search-and-poun; /archives//html/Amps/2017-06/msg00014.html (10,653 bytes)
17. [Amps] Operational Input Impedance (score: 1): Author: Steve London <n2icarrl@gmail.com>; Date: Fri, 22 Dec 2017 14:11:13 -0700; Several years ago, I modified my Alpha 76PA, replacing the 8874's with a pair of 3CX800A7LG's, purchased from Alpha. These were new, Chinese made tubes. Other than that, I know very little about them; /archives//html/Amps/2017-12/msg00120.html (7,774 bytes)
18. [Amps] Alpha 76 plate choke (score: 1): Author: Steve London <n2icarrl@gmail.com>; Date: Thu, 4 Jan 2018 15:31:20 -0700; All this plate choke discussion has me curious about the Alpha 76 plate choke arrangement. The schematic shows two 15 uH chokes in series - the usual large one, and a very small one, with bypass caps; /archives//html/Amps/2018-01/msg00044.html (7,146 bytes)
19. [Amps] HF-2500M Control Board (score: 1): Author: Steve London <n2icarrl@gmail.com>; Date: Tue, 16 Jan 2018 14:08:44 -0700; I am trying to troubleshoot a HF-2500M for a friend. After being abandoned by the previous owner for many years, my friend fired it up about 3 weeks ago. All was well until the big bang and flash. It; /archives//html/Amps/2018-01/msg00079.html (7,084 bytes)
20. [Amps] SB-220 tick,tick,tick (score: 1): Author: Steve London <n2icarrl@gmail.com>; Date: Sun, 20 Jan 2019 09:02:21 -0700; I have an SB-220, of unknown lineage. While using it, I noticed that on receive, listening on my receiver, I was hearing a strong tick, tick, tick sound, about 3 ticks per second. With a little exper; /archives//html/Amps/2019-01/msg00085.html (7,133 bytes)

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