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101. [Amps] how much C in PS is too much ? (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Mon, 22 Mar 2010 02:50:02 -0700
I am curious. I see some 10,000uf 450volt electrolytic caps for sale on Ebay. 8 of these would give you 3600volt capability at more or less 1250uF total capacitance. Is this too much?. Are there any
/archives//html/Amps/2010-03/msg00461.html (11,033 bytes)

102. [Amps] How much C in PS is too much. (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Mon, 22 Mar 2010 19:18:44 -0700
Hello All, I feel real inadequate now, knowing I just have normal capacitors in my SB-220. I must have POWER CAPS!!! to do my 'power buffering'....... The other thing, if I put twice as many of these
/archives//html/Amps/2010-03/msg00477.html (8,501 bytes)

103. [Amps] How much C in PS is too much ? (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Mon, 22 Mar 2010 19:31:09 -0700
ORIGINAL MESSAGE: REPLY: capacitance so that adding more makes no audible difference at the receiving end. This is a subjective judgment of course, but for a typical 3 kV, 850 mA supply, that is abou
/archives//html/Amps/2010-03/msg00478.html (7,744 bytes)

104. [Amps] Big cap in HV PS (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Mon, 22 Mar 2010 20:07:16 -0700
it made one helluva bang, but it's not that bad. [ b4 glitch] This 'glitch R. I use the Buss HVU series hv fuses, filled with silica, designed to interupt super high faults currents /energy levels. T
/archives//html/Amps/2010-03/msg00479.html (10,575 bytes)

105. [Amps] How much C in PS is too much ? (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Mon, 22 Mar 2010 21:27:57 -0700
In a right built amplifier one would not use series connected electrolytic caps in the power supply. available, and are way too heavy. The 4 x 47.6 uf @ 4.5 units I have are 30 lbs each... and still
/archives//html/Amps/2010-03/msg00483.html (8,336 bytes)

106. [Amps] ripple in B+ supply (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Tue, 23 Mar 2010 18:35:43 -0700
ORIGINAL MESSAGE: On Mon, 22 Mar 2010 19:31:09 -0700, "Jim Thomson" <Jim.thom at telus.net> wrote: REPLY: Peak to peak, RMS or what? 73, Bill W6WRT want to do it in peak... or peak to peak.. that's f
/archives//html/Amps/2010-03/msg00520.html (7,056 bytes)

107. [Amps] Good engineering (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Tue, 23 Mar 2010 18:55:33 -0700
ORIGINAL MESSAGE: On Mon, 22 Mar 2010 19:31:09 -0700, "Jim Thomson" <Jim.thom at telus.net> wrote: REPLY: Any fool can overbuild a product. Good engineers know when to stop, and good engineers get pa
/archives//html/Amps/2010-03/msg00521.html (8,401 bytes)

108. [Amps] ripple in B+ supply. (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Tue, 23 Mar 2010 20:21:33 -0700
On Behalf Of Jim Thomson Not that it is a big deal Jim, but what are you using to measure that RMS voltage with? Note that it is not a sine wave. 73 Gary K4FMX the 1st hv lytic... at the cold end of
/archives//html/Amps/2010-03/msg00526.html (8,332 bytes)

109. [Amps] When to stop.. caps for power supplies. (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Wed, 24 Mar 2010 04:52:57 -0700
Any fool can overbuild a product. Good engineers know when to stop, Agreed. We are paid to do good but not ridiculous engineering. Leave that for Hollywood. Or Star Wars (the project, not the movie).
/archives//html/Amps/2010-03/msg00539.html (9,951 bytes)

110. [Amps] Good Engineering. (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Wed, 24 Mar 2010 05:29:56 -0700
I suspect that was a marketing decision, not an engineering one. Some hams want only Eimac tubes and will not buy anything else. especially in an amp that costs an arm and a leg like that one does. 3
/archives//html/Amps/2010-03/msg00541.html (9,491 bytes)

111. [Amps] RF Parts plate choke (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Wed, 24 Mar 2010 05:42:18 -0700
I tried that choke in one of my amplifiers without testing it first with the GDO and it just turned into smoke on 10m. 73 Peter Nobody has been able to successfully duplicate it either. All attempts
/archives//html/Amps/2010-03/msg00542.html (7,765 bytes)

112. [Amps] 'Good engineering' (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Thu, 25 Mar 2010 05:18:37 -0700
ORIGINAL MESSAGE: REPLY: Should I go into my log and delete the 10,000 or so QSO's I have made with my Chinese 8877 and do it again with a "real" tube? 73, Bill W6WRT Chinese "real" tube #2, would ha
/archives//html/Amps/2010-03/msg00604.html (7,191 bytes)

113. [Amps] ripple in B+ supply. (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Thu, 25 Mar 2010 06:03:37 -0700
<snip> <snip> Bill you are a bright and knowledgeable fellow but I think you should back off on this one. :-) REPLY: I appreciate your kind words Jim, but I have to respectfully disagree. All of the
/archives//html/Amps/2010-03/msg00605.html (10,141 bytes)

114. [Amps] voltage spike anomoly (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Thu, 25 Mar 2010 06:45:48 -0700
One item that could mess up these observations is the presence of significant equivalent series resistance in the capacitors. Then the pulses of current through the capacitors will result in spikes o
/archives//html/Amps/2010-03/msg00607.html (7,764 bytes)

115. [Amps] 'Good engineering' (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Fri, 26 Mar 2010 07:01:34 -0700
I'm sure glad I have a delete key. And a spam box. Oh... And by the way Jim (VE7RF).... The legal, moral, fair, and gentlemanly allowable power output here in the US is 1500 watts. 73 Jim W7RY for th
/archives//html/Amps/2010-03/msg00635.html (9,264 bytes)

116. [Amps] Fw: building amps. (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Fri, 26 Mar 2010 08:04:43 -0700
transformer and PS has to be in the same cabinet. of a small 19" rack. If you do buy a new dahl/harbach xfmr, get LOTS of taps. BTW, you can grab ANY 2 x sec taps. My dahl is tapped for 0-2300-3900-4
/archives//html/Amps/2010-03/msg00639.html (13,374 bytes)

117. [Amps] Good engineering (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Wed, 24 Mar 2010 06:57:11 -0700
This is why a company like Ameritron has a line of amps from economy to well...not quite so cheap although I consider the entire line to be economy from construction to packaging. I'm not calling the
/archives//html/Amps/2010-03/msg00655.html (16,590 bytes)

118. [Amps] Good engineering (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Wed, 24 Mar 2010 07:12:56 -0700
OTOH as you say, building a truly bulletproof amp would put it out of the reach of all but a few hams making it an uneconomically viable commodity.Those who really want the best, "to them" either bui
/archives//html/Amps/2010-03/msg00656.html (15,071 bytes)

119. [Amps] building amps. (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Fri, 26 Mar 2010 08:00:44 -0700
Carl came up with some such as pole pigs. Another would be old commercial repeaters that had amps built in. I'd guess some of those transformers would be good for about a KW PEP out. Of course the po
/archives//html/Amps/2010-03/msg00657.html (14,155 bytes)

120. [Amps] 'good engineering' (score: 1)
Author: "Jim Thomson" <Jim.thom@telus.net>
Date: Sat, 27 Mar 2010 03:47:57 -0700
REPLY: Jim has been a scofflaw forever, at least for the couple of years I have been reading his illegal-amp drivel on various reflectors. you have built 5 x amps.. why not post the pix on ham_amps..
/archives//html/Amps/2010-03/msg00679.html (12,857 bytes)

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