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Total 109 documents matching your query.

61. [AMPS] Shunt regulated high voltage psu (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Wed, 30 Jan 2002 07:36:56 -0000; If the tetrode has any Ra (plate resistance) at all, Ia is relatively insensitive to Va. It is sensitive to Vg2, and my original comment was that if Vg1 and Vg2 are unstabilised so that they both flo; /archives//html/Amps/2002-01/msg00299.html (10,104 bytes)
62. [AMPS] Shunt regulated high voltage psu (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Wed, 30 Jan 2002 07:42:58 -0000; --Original Message-- From: rich <2@mail.vcnet.com> To: Steve Thompson <g8gsq@qsl.net>; AMPS <amps@contesting.com> To: <amps@contesting.com> Date: 29 January 2002 22:03 Subject: Re: [AMPS] Shunt regul; /archives//html/Amps/2002-01/msg00300.html (10,464 bytes)
63. [AMPS] Shunt regulated high voltage psu (score: 1): Author: 2@mail.vcnet.com (rich); Date: Wed, 30 Jan 2002 02:21:14 -0800; Pentodes are even less sensitive. connecting to the anode supply through a high-Z dropping R comes close enough. cheers, Peter - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/meas; /archives//html/Amps/2002-01/msg00302.html (10,509 bytes)
64. [AMPS] Shunt regulated high voltage psu (score: 1): Author: 2@mail.vcnet.com (rich); Date: Wed, 30 Jan 2002 02:21:16 -0800; To: <amps@contesting.com> // It looks to me like there should be some more curves to the right of the 0 screen current line, like there are on the 4cx350 curves. Obviously, at times the 800 has nega; /archives//html/Amps/2002-01/msg00303.html (11,050 bytes)
65. [AMPS] Shunt regulated high voltage psu (score: 1): Author: Peter.Chadwick@zarlink.com (Peter Chadwick); Date: Wed, 30 Jan 2002 10:25:08 -0000; Verty true - actually, anything with a suppressor grid. Which was why pentagrid convertors operated with the suppressor at ground gave less damping to the IF transformer in the plate. Showing age now; /archives//html/Amps/2002-01/msg00304.html (9,587 bytes)
66. [AMPS] Shunt regulated high voltage psu (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 30 Jan 2002 08:00:35 +0000; I'm not your personal Remedial Electronics coach. Go look it up. -- 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.com/g3sek -- FAQ on WW; /archives//html/Amps/2002-01/msg00305.html (9,579 bytes)
67. [AMPS] Shunt regulated high voltage psu (score: 1): Author: 2@mail.vcnet.com (rich); Date: Wed, 30 Jan 2002 03:33:17 -0800; ? I am a codger. ? Building something large with a suppressor grid is apparently difficult. Pentode sockets are pretty complex. There are seemingly no pentodes with handles. cheers, Peter - R. L. Me; /archives//html/Amps/2002-01/msg00307.html (9,872 bytes)
68. [AMPS] Shunt regulated high voltage psu (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Mon, 28 Jan 2002 14:21:08 -0000; To: <amps@contesting.com> where Possibly or probably - I'll find out when I fire one up (anyone out there save me the bother?). They put -ve contours on the 4CX1600B so maybe they just cut and pasted; /archives//html/Amps/2002-01/msg00308.html (12,272 bytes)
69. [AMPS] Shunt regulated high voltage psu (score: 1): Author: gdaught6@leland.stanford.edu (George T. Daughters); Date: Wed, 30 Jan 2002 08:38:02 -0800; When I was doing my 4cx800a/Dentron MLA2500 conversion, I got some plate curves from Svetlana in Russia. I decided that -20ma was the most "wrong way" screen current I'd ever get for a single '800a..; /archives//html/Amps/2002-01/msg00311.html (10,781 bytes)
70. [AMPS] Shunt regulated high voltage psu (score: 1): Author: wc6w@juno.com (Radio WC6W); Date: Wed, 30 Jan 2002 08:52:13 -0800; Assorted snips from the last 24 hours of the regulator discussion... On Tue, 29 Jan 2002 11:49:58 -0000 "Steve Thompson" <g8gsq@qsl.net> writes: <snip> event of of many for there's a The FET is self; /archives//html/Amps/2002-01/msg00313.html (12,026 bytes)
71. [AMPS] Shunt regulated high voltage psu (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Wed, 30 Jan 2002 17:40:50 -0000; I'm going to have to build this up and hook the storage 'scope on! The way I worked it was to assume 2kVish arcing to screen limited to about 40A by a glitch resistor. This gives a time constant in t; /archives//html/Amps/2002-01/msg00315.html (11,946 bytes)
72. [AMPS] Shunt regulated high voltage psu (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Wed, 30 Jan 2002 17:42:59 -0000; --Original Message-- From: George T. Daughters <gdaught6@leland.Stanford.EDU> To: amps@contesting.com <amps@contesting.com> To: <amps@contesting.com> Date: 30 January 2002 16:41 Subject: Re: [AMPS] S; /archives//html/Amps/2002-01/msg00316.html (10,134 bytes)
73. [AMPS] Shunt regulated high voltage psu (score: 1): Author: 2@mail.vcnet.com (rich); Date: Wed, 30 Jan 2002 09:54:59 -0800; To: <amps@contesting.com> To: <amps@contesting.com> // If the 4cx800 does not exhibit reverse screen current, Svetlana succeeded in defying the laws of physics. // I would use a means of sinking c.; /archives//html/Amps/2002-01/msg00319.html (12,756 bytes)
74. [AMPS] Shunt regulated high voltage psu (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Wed, 30 Jan 2002 10:00:58 -0800; There's been so much discussion on this, I can't resist: Last time I built a tetrode amp I used a 4-1000A grid-driven and put +550V on Ig2, provided by a stiff power supply that had no electronic reg; /archives//html/Amps/2002-01/msg00320.html (14,692 bytes)
75. [AMPS] Shunt regulated high voltage psu (score: 1): Author: wc6w@juno.com (Radio WC6W); Date: Wed, 30 Jan 2002 10:39:53 -0800; On Wed, 30 Jan 2002 17:40:50 -0000 "Steve Thompson" <g8gsq@qsl.net> writes: <snip> Hi Steve, about 40A couple of ms. and, frequencies, plenty of a the the to The screen bypass caps would necessarily; /archives//html/Amps/2002-01/msg00322.html (11,389 bytes)
76. [AMPS] Shunt regulated high voltage psu (score: 1): Author: jstrohm@texas.net (Jim Strohm); Date: Wed, 30 Jan 2002 12:58:31 -0600; Steve WB2WIK/6 writes -- One concern is that the smaller ceramic tubes (i.e. not "tetrodes with handles") are less forgiving than the 4-1000. Another concern is -- there's been a lot of "put up or sh; /archives//html/Amps/2002-01/msg00323.html (10,858 bytes)
77. [AMPS] Shunt regulated high voltage psu (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Wed, 30 Jan 2002 11:09:03 -0800; other tetrode amps (homebrew projects) have been 4CX250B and 4CX1000A types, used the same approach with those. Screen current goes positive, negative, whatever -- mostly averaging "zero," and adjus; /archives//html/Amps/2002-01/msg00325.html (12,169 bytes)
78. [AMPS] Shunt regulated high voltage psu (score: 1): Author: 2@mail.vcnet.com (rich); Date: Wed, 30 Jan 2002 11:41:45 -0800; // Sounds good. How did you protect the screen from loss of anode potential?. cheers, Steve - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end -- FAQ on WWW: http://www; /archives//html/Amps/2002-01/msg00328.html (9,810 bytes)
79. [AMPS] Shunt regulated high voltage psu (score: 1): Author: 2@mail.vcnet.com (rich); Date: Wed, 30 Jan 2002 11:41:47 -0800; The original idea for shunt screen regulator for small tetrodes came from an Eimac booklet titled "Single Sideband" c. 1955. The original Plywood Box cost me c. $1300 in parts. That works out to <$9; /archives//html/Amps/2002-01/msg00329.html (11,579 bytes)
80. [AMPS] Shunt regulated high voltage psu (score: 1): Author: stevek@jmr.com (Steve Katz); Date: Wed, 30 Jan 2002 11:48:48 -0800; However, in 25 years, this problem has never occurred. The screen, plate, grid and filament supplies are all on the same chassis, through the same power cord, using the same circuit breaker, so will; /archives//html/Amps/2002-01/msg00330.html (9,687 bytes)

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