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121. Fwd: [AMPS] Need 1500T to compete collection (score: 1): Author: Wlfuqu00@uky.edu (wlfuqu00@uky.edu); Date: Fri, 19 Oct 2001 09:12:50 -0400; I am in need of a EIMAC 1500T to complete my EIMAC Glass Triode Tube Collection. Please contact me if you have or know of one for sale or trade. 73 Bill wa4lav -- FAQ on WWW: http://www.contesting.co; /archives//html/Amps/2001-10/msg00394.html (6,678 bytes)
122. [AMPS] sb200/201 (score: 1): Author: Wlfuqu00@pop.uky.edu (wlfuqu00@uky.edu); Date: Thu, 16 Aug 2001 10:38:04 -0400; This will only work for a solid state transceiver if you have an antenna tuner to correct for the reactive input impedance of the off tuned inputs. An 820 or 830 have tube finals and can match a wide; /archives//html/Amps/2001-08/msg00155.html (8,964 bytes)
123. [AMPS] Amp parts at Huntsville. (score: 1): Author: Wlfuqu00@pop.uky.edu (wlfuqu00@uky.edu); Date: Mon, 20 Aug 2001 11:41:25 -0400; There was a guy "Allen" that every year sells a lot of amp parts, Vac relays, caps etc. I have lost his business card and need to contact him. Does anyone have his e-mail address and/or web site? 73; /archives//html/Amps/2001-08/msg00238.html (7,380 bytes)
124. [AMPS] Plasma generator (score: 1): Author: Wlfuqu00@pop.uky.edu (wlfuqu00@uky.edu); Date: Wed, 22 Aug 2001 08:26:54 -0400; Just got a nice old Henry 3000PGB rf generator. Anyone have some schematics on this rf system? The driver is a 6AG7 oscillator, followed by a 2E26 and 4-400A. Output amp is a 3CX3000A7 And it appears; /archives//html/Amps/2001-08/msg00279.html (6,618 bytes)
125. [AMPS] CTI ComTEC, Inc. (score: 1): Author: Wlfuqu00@pop.uky.edu (wlfuqu00@uky.edu); Date: Fri, 24 Aug 2001 09:15:29 -0400; That is one think I like about guy that builds these. He has made it difficult for this amp to be modified for 11 meters or 10. He, unlike the others, marketing his amps to the CB crowd. 73 Bill wa4l; /archives//html/Amps/2001-08/msg00313.html (8,833 bytes)
126. Fwd: RE: Re: [AMPS] CTI ComTEC, Inc. (score: 1): Author: Wlfuqu00@pop.uky.edu (wlfuqu00@uky.edu); Date: Fri, 24 Aug 2001 09:30:49 -0400; OOPS the word NOT is missing.... He, unlike the others, is not marketing his amps to the CB crowd. -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative re; /archives//html/Amps/2001-08/msg00314.html (9,536 bytes)
127. [Amps] (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Fri, 22 Aug 2003 09:37:42 -0400; Check this out. http://www.wordreference.com/English/definition.asp?en=parasitic+oscillation 73 Bill wa4lav _______________________________________________ Amps mailing list Amps@contesting.com http:; /archives//html/Amps/2003-08/msg00013.html (6,724 bytes)
128. Re: [Amps] Parasitics (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Fri, 22 Aug 2003 09:41:58 -0400; Sorry, Left off topic line. Date: Fri, 22 Aug 2003 09:37:42 -0400 To: rlm <r@somis.org>, <peter.chadwick@Zarlink.Com>, "AMPS" <amps@contesting.com> From: Bill Fuqua <wlfuqu00@uky.edu> Check this out.; /archives//html/Amps/2003-08/msg00014.html (7,533 bytes)
129. [Amps] QST article (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Mon, 27 Oct 2003 08:07:31 -0500; Did anyone notice the article in November 2003 QST about the guys modifying a Collins 300-G (AM BC band ) to HF. They attached motor drive controls for the plate tanks circuit but no mention of the n; /archives//html/Amps/2003-10/msg00261.html (6,725 bytes)
130. Re: [Amps] About single 4CX250b output power (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Mon, 27 Oct 2003 08:20:48 -0500; One option would be to cathode drive it (if you have the drive power) with it operating in AB1 with usual bias. This would provide feed-thru power and improve linearity due to inherent negative feedb; /archives//html/Amps/2003-10/msg00262.html (9,376 bytes)
131. [Amps] Johnson Desk KW (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Fri, 31 Oct 2003 09:37:42 -0500; Got a Johnson Desk KW and notice something unusual about the design. The RF amplifier has a linked variable capacitor and inductor in plate PI output circuit which switches out the variable capacitor; /archives//html/Amps/2003-11/msg00005.html (6,865 bytes)
132. Re: [Amps] About single 4CX250b output power (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Tue, 04 Nov 2003 09:35:25 -0500; I noticed a cathode driven amplifier in one of my old Radio Handbooks. It used a pair of 4CX250 tubes. I suspect cathode drive would provide less distortion. Also, oddly enough in a very old QST ther; /archives//html/Amps/2003-11/msg00051.html (9,639 bytes)
133. Fwd: Re: [Amps] Anyone ever use a 6C21? (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Wed, 05 Nov 2003 10:18:49 -0500; I use a pair of 250THs in the 60s in grounded grid ( bias needed) driven by a pair of 6146B and a 20A exciter. Worked great I only had about 2KV plate high voltage supply at the time. 73 Bill wa4lav; /archives//html/Amps/2003-11/msg00062.html (7,621 bytes)
134. Re: [Amps] AC or DC better for indirectly heated cathodes? (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Thu, 20 Nov 2003 07:26:26 -0500; Keep in mind that most DC regulated supplies are not intended to be operated in the strong RF fields within an amplifier. RF could drive the DC supply bonkers. Check the supply in place with AC tempo; /archives//html/Amps/2003-11/msg00298.html (10,083 bytes)
135. Re: [Amps] 4pr-1000b,Y448 tubes (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Thu, 11 Dec 2003 08:15:31 -0500; I have talked with R. Brandon at EIMAC (CPI) about this. It seems that they are 4-1000A and the 4PR1000 tubes are the same. The 4PR1000b tubes are taken off the production line of the 4-1000A tubes a; /archives//html/Amps/2003-12/msg00175.html (9,852 bytes)
136. Re: [Amps] Re: Amps Digest, Vol 12, Issue 35 (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Thu, 18 Dec 2003 09:24:32 -0500; After looking at a web site http://www.cree.com/ftp/pub/appnote1.pdf I realize that all these linearization techniques are used with linear amplifiers to make them more linear except for one (Envelop; /archives//html/Amps/2003-12/msg00293.html (10,161 bytes)
137. Re: Re: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1): Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>; Date: Mon, 29 Dec 2003 14:49:50 -0500; Now you have done it. You have hit upon one of my favorite pet peeves. My electonics instructor in high school, Hugh J. Phillips, always said Grids Dont Leak, It is bias by grid rectification!. The r; /archives//html/Amps/2003-12/msg00454.html (11,770 bytes)
138. Re: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Thu, 01 Jan 2004 18:00:00 -0500; At 04:50 PM 1/1/2004 -0600, Dr. William J. Schmidt, II wrote: Class A has less little IMD, class B has a lot? C would be really nasty if not for output filtering (good tank circuit) C will have lots; /archives//html/Amps/2004-01/msg00008.html (7,940 bytes)
139. [Amps] Power tube tester (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Thu, 01 Jan 2004 19:13:01 -0500; Well, I have gotten back to my 5 year old project. Hope to have it ready to show our local radio club on Monday. This project is a portable transmitting tube tester. It has sockets for 6146 ( and it'; /archives//html/Amps/2004-01/msg00009.html (9,572 bytes)
140. Re: [Amps] 3.5 kV 2A REGULATED Power Supply: Schematic ? (score: 1): Author: Bill Fuqua <wlfuqu00@uky.edu>; Date: Thu, 01 Jan 2004 19:22:29 -0500; IMD is caused by the odd order terms of the polynomial ( output voltage/input voltage) of a device. The harmonics of these can terms ( 3rd, 5th etc harmonics) can easily be filtered but the near by I; /archives//html/Amps/2004-01/msg00010.html (10,063 bytes)

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