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Total 107 documents matching your query.

81. Re: [Amps] P/S upgrade (score: 1)
Author: "Barrie Smith" <barrie@centric.net>
Date: Mon, 16 Mar 2009 19:40:47 -0600
Carl: What qualifies as a monster? On my largest power supply here, which is an early, untapped, Peter Dahl unit that runs 5000 volts at 2 amps, I use a 30 amp variac. Under a 1.5 amp load, with the
/archives//html/Amps/2009-03/msg00458.html (9,377 bytes)

82. Re: [Amps] Doorknob Caps Needed: Background (score: 1)
Author: "Barrie Smith" <barrie@centric.net>
Date: Thu, 28 May 2009 11:38:30 -0700
As a vague rule-of-thumb, the value of the plate blocking cap should be 4 to 5 times the value of the tune cap at resonance for the frequency in use. That would indicate 100 to 150 pf for 6M. I use a
/archives//html/Amps/2009-05/msg00246.html (10,704 bytes)

83. Re: [Amps] Eimac AS newsletters (score: 1)
Author: "Barrie Smith" <barrie@centric.net>
Date: Tue, 25 Aug 2009 09:44:44 -0700
Speaking of which, I have a couple of the very old ones where Eimac recommends nichrome wire as plate and grid leads to reduce the possibility of parasitic oscillations. Where they are, or when I'll
/archives//html/Amps/2009-08/msg00495.html (7,383 bytes)

84. [Amps] 6C21 (score: 1)
Author: "Barrie Smith" <barrie@centric.net>
Date: Fri, 29 Jan 2010 11:45:31 -0700
Carl & Roger: I'm really not arguing with you here. However, comparing a 6C21 to a 750T runs contrary to what I know about the tubes. An older, local ham gave me a NIB pair of 6C21s about 25 years ag
/archives//html/Amps/2010-01/msg00435.html (9,220 bytes)

85. Re: [Amps] 6C21 (score: 1)
Author: "Barrie Smith" <barrie@centric.net>
Date: Fri, 29 Jan 2010 13:22:27 -0700
The filament voltage for the 6C21 in pulse service is 8.3 volts. For normal service it is 7.5 volts. 73, Barrie, W7ALW I can't find the thread or initial question leading to this but you are right. I
/archives//html/Amps/2010-01/msg00448.html (11,428 bytes)

86. Re: [Amps] Good amp to buy maybe build? (score: 1)
Author: "Barrie Smith" <barrie@centric.net>
Date: Fri, 29 Jan 2010 14:31:08 -0700
Scan the bare front panel and have a graphics shop print whatever you want on vinyl. You can have any color background and any color text. With the vinyl and inks in use now the product would last te
/archives//html/Amps/2010-01/msg00460.html (19,004 bytes)

87. [Amps] Secondary resistance (score: 1)
Author: "Barrie Smith" <barrie@centric.net>
Date: Tue, 23 Feb 2010 11:28:56 -0700
When using Duncan Amps power supply designer, how do you properly measure the secondary resistance on a center-tapped transformer? Do you measure the whole winding, or from center-tap to the outside
/archives//html/Amps/2010-02/msg00704.html (6,381 bytes)

88. [Amps] 8877 FS or trade (score: 1)
Author: "Barrie Smith" <barrie@centric.net>
Date: Sun, 9 May 2010 15:32:56 -0600
I've got two new spare 8877s for my HB 6M amp that I built in the early 1990s. I'm still using the original tube with full output. I did test both the spares a few weeks ago. Both put out approximate
/archives//html/Amps/2010-05/msg00123.html (6,896 bytes)

89. [Amps] HV Connectors (score: 1)
Author: "Barrie Smith" <barrie@centric.net>
Date: Sun, 23 May 2010 13:31:26 -0600
Some time ago, there was a thread concerning HV connectors and HV wire. I did not pay too much attention at the time, because I had no needs, Things have changed, and I find myself building a small a
/archives//html/Amps/2010-05/msg00337.html (7,057 bytes)

90. [Amps] Plate load impedence (score: 1)
Author: "Barrie Smith" <barrie@centric.net>
Date: Sat, 3 Jul 2010 18:06:36 -0600
Just recently there was a thread concerning the multiplication factor for calculating plate load impedence. There was one post that indicated that the multiplication factor changed relative to class
/archives//html/Amps/2010-07/msg00048.html (6,545 bytes)

91. [Amps] Glass tube plate color (score: 1)
Author: "Barrie Smith" <barrie@centric.net>
Date: Sun, 15 Aug 2010 09:55:52 -0600
Speaking of class C, I have just completed a nostalgia rig using a push-pull pair of VT-127As (somewhat similar to the 100TL, but looks like a spaceman with grid and plate pins sticking out the sides
/archives//html/Amps/2010-08/msg00221.html (7,700 bytes)

92. Re: [Amps] Glass tube plate color (score: 1)
Author: "Barrie Smith" <barrie@centric.net>
Date: Sun, 15 Aug 2010 10:52:53 -0600
Damit, Carl, that's a good question! I'll try that right away. Barrie _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinf
/archives//html/Amps/2010-08/msg00225.html (9,140 bytes)

93. Re: [Amps] Glass tube plate color (score: 1)
Author: "Barrie Smith" <barrie@centric.net>
Date: Sun, 15 Aug 2010 12:02:49 -0600
Carl and all: Thanks for the responses. I did swap the tubes, as Carl suggested. The brightest glow stayed on the right. So, I suppose I have some sort of circuit imbalance. Since the visual imbalanc
/archives//html/Amps/2010-08/msg00232.html (9,982 bytes)

94. Re: [Amps] Glass tube plate color (score: 1)
Author: "Barrie Smith" <barrie@centric.net>
Date: Sun, 15 Aug 2010 12:16:45 -0600
These tubes were never intended to be used as amplifier **Perhaps they were never intended to be used in amplifiers, but they do work well in class C service. This rig is just a lark, something fun t
/archives//html/Amps/2010-08/msg00233.html (11,729 bytes)

95. Re: [Amps] Glass tube plate color (score: 1)
Author: "Barrie Smith" <barrie@centric.net>
Date: Sun, 15 Aug 2010 14:35:15 -0600
As long as we're rambling on about old tubes and glowing plates, one tube I'd really like to play with someday is the 592/3-200A3. I have several that hipot and filament test good. That tube just "lo
/archives//html/Amps/2010-08/msg00239.html (16,306 bytes)

96. Re: [Amps] GE 28F2023 capacitor specs? (score: 1)
Author: "Barrie Smith" <barrie@centric.net>
Date: Sat, 28 Aug 2010 11:52:31 -0700
Carl: It just happens that I tested several of those exact same caps for ripple current recently. I hipoted them, as well. I ran something over 1.5 amps AC through a few of the caps for well over an
/archives//html/Amps/2010-08/msg00422.html (7,851 bytes)

97. Re: [Amps] 4-250A testing (score: 1)
Author: "Barrie Smith" <barrie@centric.net>
Date: Mon, 27 Sep 2010 18:56:33 -0600
Carl: I've often wondered if the finned anodes had greater plate dissapation than the anodes without fins. I have a variety of old Eimac glass tubes here, some with finned anodes, and some without. A
/archives//html/Amps/2010-09/msg00337.html (13,020 bytes)

98. Re: [Amps] Chinese hipot RK2671A? (score: 1)
Author: "Barrie Smith" <barrie@centric.net>
Date: Tue, 28 Sep 2010 16:03:42 -0700
I was in the same situation a few years ago. I really had everything I needed excepting the filter caps. The prices on the filter caps, on Ebay and elsewhere, were, to me, ridiculous. I ran across a
/archives//html/Amps/2010-09/msg00350.html (10,562 bytes)

99. [Amps] Radio Kit Parts (score: 1)
Author: "Barrie Smith" <barrie@centric.net>
Date: Mon, 13 Dec 2010 19:48:21 -0700
Lots of HV disk ceramics, HV electrolytics, ceramic standoffs, wire-wound resistors in usefull ranges, 2 to ten watt resistors, zener diodes, filament chokes such as I bought from you 20 years ago, l
/archives//html/Amps/2010-12/msg00152.html (8,897 bytes)

100. Re: [Amps] Alpha vs Henry (score: 1)
Author: "Barrie Smith" <barrie@centric.net>
Date: Thu, 7 Apr 2011 12:13:21 -0700
Why not just use Templestick? 73, Barrie, W7ALW Not as fast as the speed of light, it takes 2 handed coordination(-; Or 2 people if you also want to immediately kill amp power, take the shot and then
/archives//html/Amps/2011-04/msg00291.html (19,581 bytes)

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