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Total 254 documents matching your query.

41. Re: [Amps] Matched set 8122's needed (score: 1)
Author: "Hsu" <hsu4qro@gmail.com>
Date: Tue, 6 Apr 2010 06:54:52 +0800
_______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2010-04/msg00134.html (9,543 bytes)

42. [Amps] GI-7B 3rd IMD performance (score: 1)
Author: "Hsu" <hsu4qro@gmail.com>
Date: Mon, 3 May 2010 14:57:00 +0800
Hi, Anyone have test the GI-7B IMD performance? Hsu _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2010-05/msg00020.html (6,221 bytes)

43. Re: [Amps] 811A vs. 811H amp power output questions (score: 1)
Author: "Hsu" <hsu4qro@gmail.com>
Date: Sat, 22 May 2010 23:57:50 +0800
_______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2010-05/msg00295.html (9,327 bytes)

44. Re: [Amps] New Handy Amp (score: 1)
Author: "Hsu" <hsu4qro@gmail.com>
Date: Mon, 7 Jun 2010 18:40:39 +0800
_______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2010-06/msg00065.html (7,697 bytes)

45. Re: [Amps] New Handy Amp (score: 1)
Author: "Hsu" <hsu4qro@gmail.com>
Date: Mon, 7 Jun 2010 22:45:14 +0800
That is a inteesting design, it using inexpensive switching MOS FET. I have used 2SK428 built 10m amplifier, working great. I guess it is transformerless design, power supply from AC main direct. 73!
/archives//html/Amps/2010-06/msg00070.html (10,473 bytes)

46. Re: [Amps] New Handy Amp (score: 1)
Author: "Hsu" <hsu4qro@gmail.com>
Date: Mon, 7 Jun 2010 22:55:07 +0800
2SK2482 for DXV500L , not for DXV500Z. maybe they will remark the RF device like RM remark FairChild HUF7534P3 as RM3 -- Original Message -- From: "Henk Remijn PA5KT" <pa5kt@remijn.net> To: "Hsu" <hs
/archives//html/Amps/2010-06/msg00074.html (10,113 bytes)

47. Re: [Amps] 4CX1600B/GU91B (score: 1)
Author: "Hsu" <hsu4qro@gmail.com>
Date: Sat, 24 Jul 2010 10:02:52 +0800
Alek, I do not think the FU-728F is a good tube for replace the 4CX1600B, the 4CX1000A/FU-100F should be better. because there are a plent of 4CX1000A resource in the market. 73! Hsu -- Original Mess
/archives//html/Amps/2010-07/msg00228.html (10,125 bytes)

48. Re: [Amps] New HF amplifier (score: 1)
Author: "Hsu" <hsu4qro@gmail.com>
Date: Sat, 31 Jul 2010 21:18:22 +0800
This Amplifier Are Made in China.Based on The OM2500. -- Original Message -- From: <n8de@thepoint.net> To: "RICHARD SOLOMON" <w1ksz@q.com> Cc: "Amplifier Reflector" <amps@contesting.com> Sent: Saturd
/archives//html/Amps/2010-07/msg00379.html (9,800 bytes)

49. Re: [Amps] New HF amplifier (score: 1)
Author: "Hsu" <hsu4qro@gmail.com>
Date: Sat, 31 Jul 2010 22:19:45 +0800
FU-728: Pd=1200W Po1800W(CW)/2500W (two tone pep) Filament: 9V Chinese Mil-spec tube. I'm supplier of this tube. 73!Hsu -- Original Message -- From: "Felipe Ceglia" <felipeceglia2@gmail.com> To: <amp
/archives//html/Amps/2010-07/msg00382.html (12,447 bytes)

50. Re: [Amps] New HF amplifier (score: 1)
Author: "Hsu" <hsu4qro@gmail.com>
Date: Tue, 3 Aug 2010 00:12:45 +0800
It seems any thing what made in China should be cheap.But YOU WRONG! About this amplifier, although I'm not desigener,but one of my best friend is one of designer ( write firmware for this project),h
/archives//html/Amps/2010-08/msg00005.html (7,845 bytes)

51. Re: [Amps] New HF amplifier (score: 1)
Author: "Hsu" <hsu4qro@gmail.com>
Date: Tue, 3 Aug 2010 12:03:17 +0800
This amplifier have been sold more than 20 units in Chinese market., NEVER have this problem. Take it easy Hsu before you have a stroke... Yes, your friend may be a great guy - but band taps on a tor
/archives//html/Amps/2010-08/msg00010.html (10,692 bytes)

52. Re: [Amps] New HF amplifier (score: 1)
Author: "Hsu" <hsu4qro@gmail.com>
Date: Tue, 3 Aug 2010 14:24:07 +0800
About This amplifier, If anyone interested in it, Please contact with me direct,I can send you the pictures and the detail 73!Hsu. _______________________________________________ Amps mailing list Am
/archives//html/Amps/2010-08/msg00011.html (7,845 bytes)

53. [Amps] evaporative cooling 4CX5000R (score: 1)
Author: "Hsu" <hsu4qro@gmail.com>
Date: Fri, 20 Aug 2010 08:49:28 +0800
I have six FU-101Z vacuum tubes, same as 4CX5000R but evaporative cooling.I can not test and re-active it. Brand new, with origional carton.never open and used.$250/ea,If you pick up all, I pay the s
/archives//html/Amps/2010-08/msg00329.html (6,477 bytes)

54. Re: [Amps] Ebay Tube (score: 1)
Author: "Hsu" <hsu4qro@gmail.com>
Date: Thu, 26 Aug 2010 13:30:19 +0800
_______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2010-08/msg00379.html (8,685 bytes)

55. Re: [Amps] soft start on filament (score: 1)
Author: "Hsu" <hsu4qro@gmail.com>
Date: Sun, 29 Aug 2010 13:58:35 +0800
It is due to the current inrush, that 'll led to large magnetic force and damage the filament.Another reason is the current inrush will led to the main fuse burn or the trip switch active. 73!Hsu ___
/archives//html/Amps/2010-08/msg00429.html (8,303 bytes)

56. Re: [Amps] Why are 833s so Expensive (score: 1)
Author: "Hsu" <hsu4qro@gmail.com>
Date: Mon, 27 Sep 2010 12:33:05 +0800
Hi Roger, I live near one of 833A's manufacturer.only 1km haha. Now, the 833A manufacturer's list price is CNY 600 orso, ( no more than $100) But if quantity what you want is big, I think it should b
/archives//html/Amps/2010-09/msg00317.html (8,301 bytes)

57. Re: [Amps] Chinese hipot RK2671A? (score: 1)
Author: "Hsu" <hsu4qro@gmail.com>
Date: Wed, 29 Sep 2010 05:58:14 +0800
I'm using a needle meter version of this hi-pot tester. if is made in China. please attenttion the main transformer, some inpensive version only use a micro wave oven transformer,but elegant version
/archives//html/Amps/2010-09/msg00349.html (9,870 bytes)

58. Re: [Amps] Chinese hipot RK2671A? (score: 1)
Author: "Hsu" <hsu4qro@gmail.com>
Date: Wed, 29 Sep 2010 07:12:42 +0800
Jim, It sounds right, but my tester is needle meter. There are many mauufacturer who built this product, but a mauufacturer in Nanking is the best. I found the same product in ebay is expensive , in
/archives//html/Amps/2010-09/msg00353.html (11,596 bytes)

59. Re: [Amps] Switching Supplies for High Current Filaments (score: 1)
Author: "Hsu" <hsu4qro@gmail.com>
Date: Thu, 7 Oct 2010 11:35:02 +0800
I have a 5A 200A swps for filament, it pull from a TV transmitter ( made in Italy) the ps made in USA.In 1990s, there are some filament swps manufacturers in China. They all promises that if you repl
/archives//html/Amps/2010-10/msg00070.html (17,513 bytes)

60. [Amps] MRF448' board for sale (score: 1)
Author: "Hsu" <hsu4qro@gmail.com>
Date: Tue, 12 Oct 2010 11:30:05 +0800
I have 4 MRF448 amplifier boards, 100% test OK , 2XMRF448 push pull in a board, 400W@ 1.8-30MHz, It was used in Chinese SSB 400W transmitter, not for 27MHz or 40MHz RF Power generator. I purchase the
/archives//html/Amps/2010-10/msg00188.html (6,563 bytes)

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