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101. Re: [Amps] HV transformer and Variac (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Fri, 24 Jul 2015 13:20:22 -0400; Hi Larry, thanks for adding that analysis. Your approach clears up something that has bothered me about Variacs for a long time: When you examine the tap/brush part of the device it is obvious the m; /archives//html/Amps/2015-07/msg00116.html (9,632 bytes)
102. Re: [Amps] Follow-up...re: Time to ask for help. (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Sun, 26 Jul 2015 15:54:56 -0400; I am trying to find out what you are trying to do. "I redid the neutralizing circuit and instead of a hard wired feed off the anode through a blocking cap to the neutralizing cap, I setup a single ad; /archives//html/Amps/2015-07/msg00146.html (8,712 bytes)
103. Re: [Amps] Henry bleeder resistor source. (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Sat, 10 Oct 2015 13:52:21 -0400; So far, I have come across this model sold by Mouser. I can get them for $11 each if I buy 10. 5 will replace the set in the 3K which are 26 years old, and other 5 will be spares. http://www.mouser.; /archives//html/Amps/2015-10/msg00037.html (9,012 bytes)
104. Re: [Amps] Dick Manual (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Thu, 29 Oct 2015 22:08:24 -0400; The original poster, ELoHi@gmx.com is a troll and should be unsubscribed IMO. I agree, research has shown: http://lists.contesting.com/archives//html/Amps/2015-03/msg00027.html -- Ron KA4INM - Youva; /archives//html/Amps/2015-10/msg00080.html (7,856 bytes)
105. Re: [Amps] WTB 220 mhz amp/ Eimac question (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Sun, 8 Nov 2015 08:19:45 -0500; If they would do it, I may pay to ship it to Eimac and have them open it up to hopefully tell me what the heck happened. If it just up and died of natural causes, then I owe the buyer a refund and I; /archives//html/Amps/2015-11/msg00022.html (8,281 bytes)
106. Re: [Amps] Hallicrafters HT-41 (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Sun, 8 Nov 2015 08:27:21 -0500; I'm going through an HT-41 billed as "plug and play" which arrived with a solid state conversion replacing the two 866AX rectifier tubes. The conversion consists of a plexiglas rectangle with multip; /archives//html/Amps/2015-11/msg00023.html (8,822 bytes)
107. Re: [Amps] Question about SPE 1.3K-FA amplifier (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Mon, 9 Nov 2015 08:05:21 -0500; Here is a link to what looks like the Test Report for FCC Type Acceptance. https://fccid.io/pdf.php?id=2443307 Curious as to what folks think about the results. I thought there would be a measuremen; /archives//html/Amps/2015-11/msg00038.html (9,475 bytes)
108. Re: [Amps] Need for bias switch (CW/SSB) (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Sun, 17 Jan 2016 09:55:45 -0500; I don't think this is true. Class C will generate terrible key clicks because it won't preserve the keying envelope. That is not necessarily so, the keying waveform will be altered for sure, but I o; /archives//html/Amps/2016-01/msg00018.html (9,481 bytes)
109. Re: [Amps] SG-500 ALC Interface to Kenwood TS-480HX (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Mon, 25 Jan 2016 18:19:13 -0500; Given the SG-500's ALC control signal is +1 to +5 VDC, and the Kenwood TS-480HX's ALC signal expects -7VDC, how have others interfaced these two pieces of equipment? I don't know, but a 9 Volt batte; /archives//html/Amps/2016-01/msg00065.html (7,385 bytes)
110. Re: [Amps] Supplier for RD16HHF1 transistor ? (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Mon, 22 Feb 2016 11:48:44 -0500; Does anybody know of a RELIABLE supplier for the obsolete RD16HHF1 transistor? Not obsolete, "RF Parts" sells them for $$4.75 each. Possibly replaceable with several other RF Trans. https://www.rfpa; /archives//html/Amps/2016-02/msg00052.html (7,860 bytes)
111. Re: [Amps] HL2K high input SWR on 21 MHz (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Sun, 13 Mar 2016 11:45:12 -0400; Hi all, I have a HL2K amplifier (pair of 3-500Z) for several years now (got it second hand) and it always had a high input SWR on 21 MHz. I matched it with my TS850 antenna tuner, so it was OK. Duri; /archives//html/Amps/2016-03/msg00023.html (8,638 bytes)
112. Re: [Amps] transformer distortion question (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Mon, 14 Mar 2016 12:57:27 -0400; I'm making a low power MOSFET amplifier for 475kHz with an IRF510. It works fairly well and looks nice on the scope, but now I'm trying to transformer couple its output to a second stage. I made a c; /archives//html/Amps/2016-03/msg00028.html (8,822 bytes)
113. Re: [Amps] warm up time for TX tubes (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Mon, 11 Apr 2016 14:38:55 -0400; Slightly complex subject. Specifically, What are the necessary conditions for voltages at plate , screen and control grid during Warm up for indirectly heated tetrode tubes. I have seen directions th; /archives//html/Amps/2016-04/msg00020.html (9,516 bytes)
114. Re: [Amps] SCR to adjust 240v to 200v (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Fri, 12 Aug 2016 15:00:00 -0400; /* snip */ Talked to Henry. They asked me the plate transformer number, which they looked up and said "Oh, that's the 200v European transformer". So, I put a hefty variac on the 240v AC incoming and; /archives//html/Amps/2016-08/msg00008.html (7,885 bytes)
115. Re: [Amps] Capacitor and Alpha 374 question (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Sat, 20 Aug 2016 17:45:42 -0400; Hi Paul W9AC Christensen: /* snip */ I ordered one last week (P/N MOC5M35ES) for an Alpha PA-70A that was manufactured in 1970 (S/N 002). The new cap is 35uF/5KV and fits inside the 70A, 70V, 77, 77D; /archives//html/Amps/2016-08/msg00047.html (8,507 bytes)
116. Re: [Amps] FL-2100B Plate Current (Ken Durand) (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Wed, 14 Sep 2016 19:17:08 -0400; Well, if the shunt were open you would see a pinned meter and it would possibly burn it out (which would leave you with a dead amp). I have seen carbon resistors that have cooked them self to a very; /archives//html/Amps/2016-09/msg00057.html (7,761 bytes)
117. Re: [Amps] Alpha 87A Alpha Max Upgrade (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Thu, 13 Oct 2016 09:00:15 -0400; I believe the greatest issue with maintaining the 87A further down the road are the hard programmed PALs (16 and 20) that as I understand cannot be read or cloned. Anyone have any success? Everythin; /archives//html/Amps/2016-10/msg00036.html (9,604 bytes)
118. Re: [Amps] one question test for hams (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Thu, 13 Oct 2016 18:32:13 -0400; Answer True or false....... "All failures of ham radios are caused, ultimately, by excessive heat." Come on, have fun with this if you can. 73 FALSE, no one can ever ignore "operator headspace error; /archives//html/Amps/2016-10/msg00047.html (8,382 bytes)
119. Re: [Amps] gs35b hf amp (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Thu, 20 Oct 2016 10:16:29 -0400; HI to all of the group. Looking for a little help/knowledge. I am building a gs35b amplifier for 10-160 meters. I am having a heck of a time trying to get 10 meters output/resonance correct due to t; /archives//html/Amps/2016-10/msg00097.html (8,319 bytes)
120. Re: [Amps] "Conventional" current flow (score: 1): Author: Ron Youvan <ka4inm@gmail.com>; Date: Fri, 28 Oct 2016 18:46:00 -0400; Jim W8ZR Garland wrote in part: Concur with Bill W6WRT re "positive vs negative" convention in describing current. The convention we use now is left over from at least a hundred years ago when a scie; /archives//html/Amps/2016-10/msg00137.html (11,263 bytes)

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