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61. [AMPS] Additional Tube Brand Question (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Thu, 1 Feb 2001 22:01:21 +1300; As I recall ran about 3kV with better than 5% regulation. Cannot recall resting dissipation, but it would have been OK. If high the way to go is to increase the value of zener bias, IMO. 73 end Barry; /archives//html/Amps/2001-02/msg00004.html (12,760 bytes)
62. [AMPS] Hello Hello (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Tue, 20 Feb 2001 17:31:16 +1300; I was asking myself the same question! 73 end Barry Kirkwood PhD ZL1DD Signal Hill Homestay 66 Cory Road Palm Beach Waiheke Island 1240 NEW ZEALAND www.waiheke.co.nz/signal.htm -- Original Message --; /archives//html/Amps/2001-02/msg00258.html (7,275 bytes)
63. [AMPS] add a Filament Xfmr center tap. (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Wed, 28 Feb 2001 20:43:06 +1300; HoHo! A look at your 1928 ARRL Handbook will show you that Xmas tree lamps are just the thing to make a resistive centre tap fpr your filament transformer! 73 end Barry Kirkwood PhD ZL1DD Signal Hill; /archives//html/Amps/2001-02/msg00370.html (8,916 bytes)
64. [AMPS] Additional Tube Brand Question (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Thu, 1 Feb 2001 15:59:43 +1300; This is a multi-part message in MIME format. --=_NextPart_000_006A_01C08C67.FDBB3B00 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I used an L-4B happily; /archives//html/Amps/2001-01/msg00002.html (11,252 bytes)
65. [AMPS] 3phases & Alpha (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Thu, 4 Jan 2001 01:35:53 +1300; Just so. I do not know what the US conventions are, but here the term "double insulated" is used to describe equipment that has the ac line (what we call phase and neutral) applied to the motor, tran; /archives//html/Amps/2001-01/msg00092.html (9,224 bytes)
66. [AMPS] viewstar amplifier (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Sun, 7 Jan 2001 08:30:38 +1300; I own a Viewstar. Gives good service. The plate blocking capacitor died, replaced with a bigger one. Capacitor stack also died and took ht rectifier with it, not unexpected in view of the age of the; /archives//html/Amps/2001-01/msg00215.html (11,071 bytes)
67. [AMPS] More on the Viewstar amplifier (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Sun, 7 Jan 2001 11:39:30 +1300; Very interesting Phil. Thanks. My PT2000A has 1.8mHz built in, otherwise as you describe. Yes, transformers by Hammond. 73 Baz end Barry Kirkwood PhD ZL1DD Signal Hill 66 Cory Road Palm Beach Waiheke; /archives//html/Amps/2001-01/msg00218.html (13,716 bytes)
68. [AMPS] viewstar amplifier (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Sun, 7 Jan 2001 11:46:20 +1300; My apologies,Paul, And congratulations on a good amp. Sorry about the disinformation which came from south of the 49th parallel, where some of the natives incline to the believe that all things more; /archives//html/Amps/2001-01/msg00220.html (9,128 bytes)
69. [AMPS] HT supplies for 3 phase? (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Mon, 8 Jan 2001 11:56:56 +1300; FWIW : I once bought a British Admiralty Marconi HF broadband TX (used rows of 4x250s feeding ?delay lines). It had three phase transformers in the HT supply. Only about 1.1 kV secondary as I recall,; /archives//html/Amps/2001-01/msg00257.html (12,033 bytes)
70. [AMPS] Advice about what linear to buy (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Tue, 9 Jan 2001 11:07:02 +1300; I endorse Jim's comments. All other things being equal, the quality of power amplifiers, whether for rf or audio can to a large degree be related to their size and weight. The same argument goes for; /archives//html/Amps/2001-01/msg00289.html (14,525 bytes)
71. [AMPS] Advice about what linear to buy (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Tue, 9 Jan 2001 13:24:46 +1300; I beg to differ. I used the term "all things being equal". Hence issues of shielding integrity, supply regulation and tuning apply in the hypothetical case of the amplifier being pushed close to its; /archives//html/Amps/2001-01/msg00294.html (11,510 bytes)
72. [AMPS] Re: Two XFMRs parallel (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Thu, 18 Jan 2001 12:10:07 +1300; I cannot speak to high voltage transformers, but it is not uncommon to directly parallel same kind transformers in low voltage supplies. 73 end Barry Kirkwood PhD ZL1DD Signal Hill Homestay 66 Cory R; /archives//html/Amps/2001-01/msg00431.html (8,302 bytes)
73. [AMPS] Clipperton L amplifier (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Sat, 20 Jan 2001 12:45:24 +1300; The last tetrode amp of any significance I built was almost half a century ago. Used an 813 in class C. The texts at the time made much of the role of the screen in the possible production of VHF par; /archives//html/Amps/2001-01/msg00514.html (10,934 bytes)
74. [AMPS] Clipperton L amplifier (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Sat, 20 Jan 2001 21:40:57 +1300; Fair comment Ian: The reference cited did just that. The point I was trying to make was that changing to screened wire in a particular instance might well have been sufficient to solve the problem. 7; /archives//html/Amps/2001-01/msg00517.html (14,534 bytes)
75. [AMPS] Fertility (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Wed, 31 Jan 2001 00:42:51 +1300; I know nothing about the effects of non-ionising radiation on fertility... Save that spermatogenisis is retarded if the testes are not below core body temperature, ergo thermal effects might reduce f; /archives//html/Amps/2001-01/msg00706.html (9,945 bytes)
76. [AMPS] Advice On Homebrewing Chassis Please (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Wed, 27 Dec 2000 11:48:43 +1300; Out here these are known as "Hank Bushes". And they are great for panels that need to be removed from time to time. 73 Barry Kirkwood PhD ZL1DD Signal Hill 66 Cory Road Palm Beach Waiheke Island 1240; /archives//html/Amps/2000-12/msg00319.html (9,908 bytes)
77. [AMPS] Alpha (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Fri, 29 Dec 2000 19:43:18 +1300; I'll drink to that. The great thing about Ham radio is that there are so many ways you can do it. Good on Bob for giving everybody a rev up about home construction, and good on Chuck for a gracious r; /archives//html/Amps/2000-12/msg00341.html (9,710 bytes)
78. [AMPS] Alpha (HOME BREW OR NOT?) (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Sun, 31 Dec 2000 01:16:51 +1300; The issue of light weight amps has come up before. Deserves serious thought. PL509 tubes could have filaments seriesed to run direct from mains, saving a filament transformer. Keep thinking back to t; /archives//html/Amps/2000-12/msg00368.html (12,896 bytes)
79. Fw: [AMPS] New (OLD) tube arrived (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Tue, 14 Nov 2000 10:24:13 +1300; end Barry Kirkwood PhD ZL1DD Signal Hill 66 Cory Road Palm Beach Waiheke Island 1240 NEW ZEALAND www.waiheke.co.nz/signal.htm -- Original Message -- From: Barry Kirkwood <bjk@ihug.co.nz> To: <w7ti@jp; /archives//html/Amps/2000-11/msg00129.html (10,517 bytes)
80. [AMPS] Low Pass Filter (score: 1): Author: bjk@ihug.co.nz (Barry Kirkwood); Date: Wed, 29 Nov 2000 15:49:39 +1300; also see : Weinrich & Carroll, QST Nov 1968. Same info on p15-7 1983 ARRL handbook. In years past I used this design with success. 73 end Barry Kirkwood PhD ZL1DD Signal Hill 66 Cory Road Palm Beach; /archives//html/Amps/2000-11/msg00419.html (9,507 bytes)

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