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1. Re: [Amps] FU728F Tube (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Tue, 29 Sep 2009 15:17:14 +0800; FU-728F was design by Chinese independently, it can not replace 4CX1500Bdirect, you need do a bit some work ( Chanage filamet voltage to 9V ) but more powerful, it can output morethan 2000W @Ua=3200V; /archives//html/Amps/2009-09/msg00352.html (6,960 bytes)
2. [Amps] SG500 mobil amplfier for sale (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Thu, 27 Aug 2009 08:13:07 +0800; I have a SGC SG500 amplifier for sale, $ 680 shipped,only used for few minutes in my car,but the top cover and heat sink with small scaur. 73!Hsu _______________________________________________ Amps; /archives//html/Amps/2009-08/msg00521.html (6,583 bytes)
3. Re: [Amps] Grounded Grid(Screen) 4CX250B power gain (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Mon, 20 Jul 2009 07:15:06 +0800; Hi, George, I just modyfy the Henry TEMPO 2001 convert the 3CX400A7 to 4CX250B in GG configation, tied the cathode and G1(serial a 100ohm resistor) together. I'll test it today. 73!Hsu -- Original Me; /archives//html/Amps/2009-07/msg00218.html (9,039 bytes)
4. Re: [Amps] Grounded Grid(Screen) 4CX250B power gain (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Mon, 13 Jul 2009 21:34:01 +0800; Nin hao George, Have your built the amplifier like this GG configation?there are two article give the result,100W in and 600w out,but I doubt these result. 73! Hsu ___________________________________; /archives//html/Amps/2009-07/msg00176.html (9,839 bytes)
5. Re: [Amps] Grounded Grid(Screen) 4CX250B power gain (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Mon, 13 Jul 2009 16:33:22 +0800; Sorry,I missed the year:here is an article in 73 magazine ,March 1973 ,P50-54 S.W.Hochman,The Ample Amplifier. _______________________________________________ Amps mailing list Amps@contesting.com ht; /archives//html/Amps/2009-07/msg00175.html (11,153 bytes)
6. Re: [Amps] Grounded Grid(Screen) 4CX250B power gain (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Mon, 13 Jul 2009 16:26:26 +0800; Hi, Don Could you tell me how much power to drive this amplifier? how much power output?your 4CX250B GG configation are same as I mentioned(screen as grid and the tied the grid and cathode together)?; /archives//html/Amps/2009-07/msg00174.html (9,484 bytes)
7. Re: [Amps] Grounded Grid(Screen) 4CX250B power gain (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Mon, 13 Jul 2009 16:22:41 +0800; Hi,Alex There are some info on this web http://home.comcast.net/~k7rld/4cx250bamplifier.htm, and there is an article in 73 magazine march ,P50-54 S.W.Hochman,The Ample Amplifier,I only have a digest,; /archives//html/Amps/2009-07/msg00173.html (10,430 bytes)
8. Re: [Amps] Grounded Grid(Screen) 4CX250B power gain (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Sat, 11 Jul 2009 20:45:19 +0800; Hi, Anyone have experience in grounded grid a pair 4CX250Bs amplifier? could you tell me how much power gain of this configation? This weekend, I'm planing to do a tube conversion in my friend's Henr; /archives//html/Amps/2009-07/msg00144.html (6,941 bytes)
9. Re: [Amps] 8874? (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Thu, 2 Jul 2009 06:55:18 +0800; Hi, Anyone have experience in 8874/3CX400A7 to GI-7B convation? 73!Hsu _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listin; /archives//html/Amps/2009-07/msg00028.html (7,736 bytes)
10. Re: [Amps] NCL2000 (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Tue, 30 Jun 2009 12:18:02 +0800; That is natural, My friend pick up a Heny Tempo 2001, the cost only $250, he ask me to find a pair inexpensive brand new NOS EIMAC 3CX8874A, a guy who in this list ask $400/ea.Could you help him to f; /archives//html/Amps/2009-06/msg00146.html (7,591 bytes)
11. [Amps] 8122 and others For sale (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Mon, 29 Jun 2009 09:53:16 +0800; PS, I have some others tube for sale I have EIMAC 4CX1000A with origional paper box and Chinese 4CX1000A(FU-100F),all brand new,EIMAC 4CX1000A: $400 Chinese 4CX1000A(FU-100F),$200. I have a EIMAC 4CX; /archives//html/Amps/2009-06/msg00138.html (7,346 bytes)
12. [Amps] 8122 For sale (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Mon, 29 Jun 2009 06:28:36 +0800; Hi, I have some brand new NOS RCA 8122 for sale,I ask $350/ea or tell me what's your best offer. JPG on request. 73!Hsu _______________________________________________ Amps mailing list Amps@contesti; /archives//html/Amps/2009-06/msg00135.html (6,227 bytes)
13. [Amps] HV transformer, HV resistor , HV diode, 8877 and 4Cx250B socket socket, RCA 8122 (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Wed, 29 Apr 2009 06:31:44 +0800; Hi, I want to order 10 HV transformers for my portable hi-pot tester(the manufacturer's minimum order is 10 pcs). Anyone would like to share these with me? Specs:input(220/110V 50Hz, 65/130mA),output; /archives//html/Amps/2009-04/msg00392.html (8,778 bytes)
14. [Amps] HV transformer Hi-Pot tester ,make correct (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Fri, 10 Apr 2009 11:32:47 +0800; The HV output current should be short circuit current,NOT out put current, the transformer is leak magnetic type,not easy to burn. 73!Hsu _______________________________________________ Amps mailing; /archives//html/Amps/2009-04/msg00113.html (6,446 bytes)
15. [Amps] HV transformer Hi-Pot tester (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Fri, 10 Apr 2009 11:26:53 +0800; Hi, I want to order 10 HV trasnformers for my another hi-pot tester(the manufactorer's minimum order is 10 piece). Anyone would like to share these with me? Specs:input(220/110V 50Hz 65/130mA),output; /archives//html/Amps/2009-04/msg00112.html (6,998 bytes)
16. Re: [Amps] microwave transformers (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Thu, 12 Mar 2009 11:18:16 +0800; I had ever to contact with a microoven transformer manufacturer,the list price for 1000w microwave oven's only $10/ea. the core not hypersil and the the wire's material is Al,Not Cu. 73!Hsu -- Origin; /archives//html/Amps/2009-03/msg00334.html (9,219 bytes)
17. Re: [Amps] Sunaire PS-1900A FS (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Mon, 2 Mar 2009 09:46:05 +0800; I have Sunair SC-10 Transceiver,It is My the 3rd rig since I licenced in 1995. I pay $200 for it(repairable) and repaired quickly.I run it only about few hours. I'm using it as one of backup rig now.; /archives//html/Amps/2009-03/msg00038.html (8,773 bytes)
18. Re: [Amps] Step Start Relay (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Sat, 14 Feb 2009 08:05:23 +0800; Hi, Thanks for younreply. Could you tell me the NTC's specs what you are using?how many CCS power rating of your transformer? I'm considering to using the R-Core transformer, it with good regulation; /archives//html/Amps/2009-02/msg00431.html (13,400 bytes)
19. Re: [Amps] Step Start Relay (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Sat, 14 Feb 2009 06:22:18 +0800; I have discussed with M.A. Erickson,KK5DR two years ago. ,he told me that NTC can not use in step-start, It is due to the current rating limted.But I think we can get very large current rating NTC no; /archives//html/Amps/2009-02/msg00429.html (11,222 bytes)
20. [Amps] Rohde & Schwarz NRS Power meter for sale (score: 1): Author: "Hsu" <hsu4qro@gmail.com>; Date: Wed, 11 Feb 2009 01:53:49 +0800; I have two R&S power meters ,I just update one of them from R&S NRS to HP437,I'll sell one.It is in very good cndx,with power sensor (0-15GHz,min. and max rating(readable) is -15-+25dbm,50ohm),$400 i; /archives//html/Amps/2009-02/msg00271.html (6,610 bytes)

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