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Total 26 documents matching your query.

1. [Amps] FS: Alpha 76A with 3CX800A7 tubes (score: 1)
Author: "Paul" <w8aef@q.com>
Date: Tue, 24 Jul 2012 10:12:27 -0700
I have an Alpha 76A equipped with a pair of 3CX800A7 tubes, Vacuum and reed relay for qsk operation, and an RF Parts RFC-3 choke that delivers 1500 watts dc output on all amateur bands, including WAR
/archives//html/Amps/2012-07/msg00259.html (7,167 bytes)

2. Re: [Amps] Amplifying RF (score: 1)
Author: "Paul" <w8aef@q.com>
Date: Sun, 29 Jul 2012 13:12:55 -0700
I seem to remember reading somewhere that there were more SB-220's sold than ALL of the other 1kw + amplifiers combined. Not responsible for repeating unconfirmed hearsay... de Paul, W8AEF __________
/archives//html/Amps/2012-07/msg00359.html (10,264 bytes)

3. Re: [Amps] Dedicated RF (score: 1)
Author: "Paul" <w8aef@q.com>
Date: Sun, 29 Jul 2012 16:22:22 -0700
Or a RTTY contest? de Paul, W8AEF _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2012-07/msg00368.html (9,700 bytes)

4. Re: [Amps] another "new" amp coming? (score: 1)
Author: "Paul" <w8aef@q.com>
Date: Sat, 4 Aug 2012 13:01:40 -0700
I do too, provided there is a removable plate on the bottom to access the power supply. de Paul, W8AEF _______________________________________________ Amps mailing list Amps@contesting.com http://li
/archives//html/Amps/2012-08/msg00096.html (9,124 bytes)

5. Re: [Amps] 87a will tell you, too (score: 1)
Author: "W8AEF" <w8aef@q.com>
Date: Wed, 15 Aug 2012 06:31:54 -0700
Does your 87A tell you what your cw rise time is? My free oscilloscope does. It also tells me if/when the transceiver does not key the amplifier fast enough to avoid hot switching and if I am operati
/archives//html/Amps/2012-08/msg00208.html (7,928 bytes)

6. Re: [Amps] just the facts (score: 1)
Author: "W8AEF" <w8aef@q.com>
Date: Thu, 16 Aug 2012 14:37:39 -0700
Several years ago I found, the hard way, that the absolutely best radio/amplifier/antenna/qth was the one that whoever I was talking to owned was the best. Didn't matter that the receiver was deaf, t
/archives//html/Amps/2012-08/msg00260.html (8,749 bytes)

7. Re: [Amps] Can some explain this curious eBay auction (score: 1)
Author: "Paul" <w8aef@q.com>
Date: Sat, 25 Aug 2012 11:23:15 -0700
If I were to pay $16k for anything I would pick them up at the sellers qth. de Paul, W8AEF ZF2JI/ZF2TA FO8DX/FO8PLA 8Q7AA XZ0A VU7RG/VU3PYM TX5C A52PP _______________________________________________
/archives//html/Amps/2012-08/msg00411.html (9,401 bytes)

8. Re: [Amps] Alpha 78 (score: 1)
Author: "Paul" <w8aef@q.com>
Date: Sat, 25 Aug 2012 14:52:41 -0700
I had an Alpha 76CA with the same Hypersil transformer that is used on the 78. I installed that transformer in my Alpha 76A equipped with a pair of 3CX800A7's and an auxiliary cooling fan, and about
/archives//html/Amps/2012-08/msg00418.html (7,924 bytes)

9. Re: [Amps] Alpha 78 (score: 1)
Author: "Paul" <w8aef@q.com>
Date: Sun, 26 Aug 2012 09:16:23 -0700
Why does my stock transformer in my 76A deliver more current (less voltage sag) and higher output power into a dummy load than the CA hypersil transformer? de Paul, W8AEF ___________________________
/archives//html/Amps/2012-08/msg00443.html (7,863 bytes)

10. Re: [Amps] Beware of seller orzel-enterprises on eBay (score: 1)
Author: "Paul" <w8aef@q.com>
Date: Tue, 11 Sep 2012 10:47:10 -0700
shipment. I sold an FT-1000 to a ham in New Jersey (I'm in Arizona). It was packed very well by myself. Unfortunately FedEx had closed my local pickup point so I shipped via UPS. The rear of the rad
/archives//html/Amps/2012-09/msg00233.html (10,623 bytes)

11. Re: [Amps] Alpha 78 in Digital Modes (score: 1)
Author: "Paul" <w8aef@q.com>
Date: Sun, 30 Sep 2012 10:14:33 -0700
Part of the reason for running low power with PSK is that when you are in receive, you are listening to 2KHz of the band and a strong signal will wipe out the whole 2KHz. Another reason for reducing
/archives//html/Amps/2012-09/msg00319.html (8,705 bytes)

12. Re: [Amps] Alpha 76/78 (score: 1)
Author: "Paul" <w8aef@q.com>
Date: Sat, 6 Oct 2012 17:30:06 -0700
I measured mine at 112uH. de Paul, W8AEF ZF2JI/ZF2TA FO8DX/FO8PLA 8Q7AA XZ0A VU7RG/VU3PYM TX5C A52PP _______________________________________________ Amps mailing list Amps@contesting.com http://lists
/archives//html/Amps/2012-10/msg00042.html (6,956 bytes)

13. Re: [Amps] 300 W single band mobile amp needed (score: 1)
Author: "Paul" <w8aef@q.com>
Date: Mon, 8 Oct 2012 14:25:29 -0700
A few years ago three Phoenix hams worked with Maricopa county planning and zoning to re-write the tower portion of the zoning ordinance. One antagonistic lady in particular was beating the drum abou
/archives//html/Amps/2012-10/msg00068.html (10,901 bytes)

14. Re: [Amps] AL-1500 filter caps (score: 1)
Author: "Paul" <w8aef@q.com>
Date: Thu, 18 Oct 2012 08:51:33 -0700
If the amplifier is 30 years old like my Alpha 76A the components probably are properly rated for the job. de Paul, W8AEF Have they changed the resistors to ones properly rated for the job? It's cert
/archives//html/Amps/2012-10/msg00105.html (7,939 bytes)

15. Re: [Amps] High grid current Titan 425 (score: 1)
Author: "Paul" <w8aef@q.com>
Date: Fri, 26 Oct 2012 22:14:20 -0700
Check Q1 and D2 in the cathode bias circuit. de Paul, W8AEF Did a bit more testing. I pulled both tubes and replaced with a known good 3cx800a7. Im seeing the same problem, and looks like I get max g
/archives//html/Amps/2012-10/msg00175.html (7,857 bytes)

16. Re: [Amps] Vacuum Relay replacements for Henry 2k Classic? (score: 1)
Author: "Paul" <w8aef@q.com>
Date: Sun, 18 Nov 2012 12:05:46 -0700
I converted a 2K3 to qsk with Electronic Cathode Bias Switching, a vacuum and a reed relay using a Rich Measures, AG6K circuit. Do a google search on AG6K and look at the TL-922/SB-220 stuff. You may
/archives//html/Amps/2012-11/msg00121.html (8,443 bytes)

17. Re: [Amps] Best Alpha amp (score: 1)
Author: "Paul" <w8aef@q.com>
Date: Mon, 19 Nov 2012 08:07:53 -0700
My new (to me) 89 also developed vernier slipping and tightening the setscrews solved the problem. de Paul, W8AEF SNIP The 89 was good but developed two problems. A small cap in the LV power supply s
/archives//html/Amps/2012-11/msg00128.html (8,115 bytes)

18. Re: [Amps] Best Alpha amp (score: 1)
Author: "Paul" <w8aef@q.com>
Date: Thu, 22 Nov 2012 09:02:44 -0700
I am keeping my 89. I can tighten set-screws, and if necessary I can replace vernier drives. de Paul, W8AEF However, the fact that you guys sold the unit says it all ... A really good device you keep
/archives//html/Amps/2012-11/msg00147.html (9,232 bytes)

19. Re: [Amps] Vacuum Relay (score: 1)
Author: "Paul" <w8aef@q.com>
Date: Sat, 8 Dec 2012 09:56:59 -0700
I agree that hot switching is most likely the cause of relay failure. I observed a flakey with one of my radios: when transmitting a continuous carrier the amplifier put out 1500 watts on my p-p watt
/archives//html/Amps/2012-12/msg00036.html (8,830 bytes)

20. [Amps] RF Waveform monitoring (score: 1)
Author: "Paul" <w8aef@q.com>
Date: Mon, 10 Dec 2012 11:21:35 -0700
The easiest way to use an oscilloscope as a waveform monitor is to obtain and use a Heathkit SB-610 waveform monitor. SB-610 manuals have a decent tutorial on their use. Another route would be to obt
/archives//html/Amps/2012-12/msg00049.html (10,410 bytes)

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