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Total 309 documents matching your query.

181. [Amps] FS: plate caps (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Wed, 29 Jun 2005 14:19:06 -0500
I have 3 each, James Millen 36002, ceramic plate caps - 3/8" and 3 each, James Millen - 1/4" all new in original factory sealed bags for those in special need. $2 each, includes first class. Or all f
/archives//html/Amps/2005-06/msg00287.html (6,282 bytes)

182. Re: [Amps] fil xfmr draw (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Fri, 8 Jul 2005 07:40:04 -0500
2 amps 73, Roy K6XK _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2005-07/msg00060.html (6,075 bytes)

183. Re: [Amps] GU-84B Cooling (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Wed, 20 Jul 2005 08:00:41 -0500
Just FYI about... "Even though the tube is cheaper than some others, it's still expensive if you have to re-tube all the time." (etc). I'm not sure how often 'all the time' is, but I've been using my
/archives//html/Amps/2005-07/msg00229.html (8,463 bytes)

184. [Amps] FS: Titan 3 and more clearance (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Tue, 2 Aug 2005 08:16:32 -0500
I'm posting this for OM Ted, K6YN now age 100 and heading for a rest home. He needs to get rid of all ham gear in a hurry. His vision is failing fast with macular degen. and he has no help to package
/archives//html/Amps/2005-08/msg00045.html (7,637 bytes)

185. Re: [Amps] Titan-3 sale prices (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Tue, 2 Aug 2005 08:33:51 -0500
Addendum... All prices are ONE-HALF current USED prices. Roy K6XK _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/am
/archives//html/Amps/2005-08/msg00046.html (6,156 bytes)

186. Re: [Amps] 6146's (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Mon, 8 Aug 2005 16:37:20 -0500
Concerning... "I just acquired several 6146's with strange markings. They are General Electric branded and marked 6146A in ink or paint or whatever it is. However, etched in the glass some are marked
/archives//html/Amps/2005-08/msg00302.html (6,513 bytes)

187. Re: [Amps] P-L with toroidal core (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Sun, 14 Aug 2005 15:35:00 -0500
About... "Hi All I homebrewed the power amplifier with the gu 78 . This amplifier utilize a PL tank circuit . For increase the separation between L1 and L2 , I would like to utilize for L2 a toroidal
/archives//html/Amps/2005-08/msg00503.html (6,970 bytes)

188. Re: [Amps] Pi-L toroid core (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Mon, 15 Aug 2005 07:48:18 -0500
Concerning, "Dear Luca, For that kind of power output you will need a Type 67 core, permeability=40. You should opt for at least a 2.4 inch core or better, as well. The core you fabricate should have
/archives//html/Amps/2005-08/msg00521.html (7,273 bytes)

189. Re: [Amps] caps SB-200 (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Sat, 20 Aug 2005 08:08:22 -0500
" I've got a PV at idle of about 2100 and it drops to 1600 or 1700 under load. I understand it s/b abt 2500. It's the original xformer, but the caps were..." Might be a rectifier diode open. GL. 73,
/archives//html/Amps/2005-08/msg00611.html (6,753 bytes)

190. Re: [Amps] caps SB-200 (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Sat, 20 Aug 2005 14:22:30 -0500
Has been stated several different ways... " Did you check it with an ohmmeter on the correct resistance?...(etc.)" His panel meter is reading correctly with no load. It is a case of poor regulation.
/archives//html/Amps/2005-08/msg00620.html (7,014 bytes)

191. Re: [Amps] plate choke (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Thu, 25 Aug 2005 06:52:32 -0500
If... "Reactance at 1.8MHz = 3099 Ohms" Then, With 3 kv on the plates, circulating current through the choke winding and through the by pass cap is 1 amp? You see, this is a useless parameter. Circul
/archives//html/Amps/2005-08/msg00666.html (6,886 bytes)

192. Re: [Amps] plate choke (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Thu, 25 Aug 2005 11:49:59 -0500
Said, "...Circulating current is limited by parallel resonances in the winding, At 1.8MHz, with a typical Ham amplifier - I don't think so..." Follows is published data pertaining to Ohmite plate cho
/archives//html/Amps/2005-08/msg00673.html (7,853 bytes)

193. Re: [Amps] plate choke (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Thu, 25 Aug 2005 14:00:58 -0500
Hmmm, "It suspect that they are talking about the Rp component as it relates to the ohmic losses (read self-heating) of the choke. For Xp = 3000 ohms, Rp would be well in excess of 200,000 ohms even
/archives//html/Amps/2005-08/msg00676.html (9,150 bytes)

194. Re: [Amps] plate choke (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Thu, 25 Aug 2005 16:37:51 -0500
Oh, "R is not even included as part of the L-C freq. equation." Oh yes it is, you have been using an approximate equation that ignored the effect of resistance. Jim, AF6O Jim, If I had been using HTM
/archives//html/Amps/2005-08/msg00681.html (7,703 bytes)

195. Re: [Amps] homebrew 4-1000 problems (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Fri, 26 Aug 2005 13:27:02 -0500
Asked, "1. main problem is a blue glow at the bottom of the tube ONLY when keyed, drive or no drive." Hi, Does the glow seem to originate on the inside SURFACE of the glass envelope? Over the years s
/archives//html/Amps/2005-08/msg00705.html (6,773 bytes)

196. Re: [Amps] fl2100 (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Sun, 9 Oct 2005 10:17:39 -0500
"Can anyone please tell me the input impedance of a pair of 572b's..." 200 ohms 73, Roy K6XK _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contest
/archives//html/Amps/2005-10/msg00203.html (6,616 bytes)

197. Re: [Amps] small air variables (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Fri, 9 Dec 2005 20:24:38 -0600
" ... for a 200 watt FET amp. autotuning experiment. Anybody have or know where to come by a couple small air variables? Say 500-1000pF max. with a 20 thousandth's air gap and 1000-1500pF max. with a
/archives//html/Amps/2005-12/msg00112.html (6,875 bytes)

198. Re: [Amps] sick SB-200 (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Thu, 23 Feb 2006 21:15:05 -0600
Was asked, "Any of you guys know the input impedence of two cetrons 572Bs? I need to retune the input network on this SB200." (etc.) About 200 ohms. 73, Roy K6XK P.S...it's customary to post your cal
/archives//html/Amps/2006-02/msg00432.html (6,605 bytes)

199. Re: [Amps] QSK (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Thu, 23 Feb 2006 21:26:54 -0600
Sorry OM, I missed your entire last transmission because I had a long distance phone call, and could not break you in order to alert you to stop sending. BTW, do you stick your fingers in your ears w
/archives//html/Amps/2006-02/msg00433.html (7,537 bytes)

200. Re: [Amps] QSK (score: 1)
Author: "Roy Koeppe" <royanjoy@ncn.net>
Date: Thu, 23 Feb 2006 21:55:43 -0600
" Whats wrong with copying CW (in your mind) and listen to someone talking to you at the same time ? My xyl does it all the time. Don't you ever speak to two people at the same time ? I once knew a C
/archives//html/Amps/2006-02/msg00435.html (7,574 bytes)

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