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181. [Amps] FS RT-834 Amp assembly Parts (score: 1): Author: John Watkins via Amps <amps@contesting.com>; Date: Sun, 12 Jul 2015 14:24:45 +0000 (UTC); I have the amp assembly from the RT-3349 amp (2 4CX350 tubes) with sockets etc. No tubes. Would fit in a medium or large flat rate box. Good for parts, sockets will work with 4CX150, 250, 350, etc; /archives//html/Amps/2015-07/msg00036.html (7,447 bytes)
182. Re: [Amps] SB-220 6 meter conversion parasites (score: 1): Author: Steve via Amps <amps@contesting.com>; Date: Fri, 17 Jul 2015 14:40:57 -0400; Hi Steve, I agree with Alex...you're not describing parasitic oscillations (i.e. oscillations at some random frequency.) You're describing a high power oscillator! Remember the difference between an; /archives//html/Amps/2015-07/msg00050.html (9,675 bytes)
183. [Amps] SB-220 6 meter conversion parasites (score: 1): Author: Roger Parsons via Amps <amps@contesting.com>; Date: Sat, 18 Jul 2015 14:15:14 +0000 (UTC); I hate to admit this, but I had very similar symptoms with an amplifier when I mis-wired the TX/RX relays... 73 Roger VE3ZI _______________________________________________ Amps mailing list Amps@cont; /archives//html/Amps/2015-07/msg00054.html (6,638 bytes)
184. Re: [Amps] Another 50MHz oscillator (score: 1): Author: Gerald Williamson via Amps <amps@contesting.com>; Date: Mon, 20 Jul 2015 11:51:18 -0400; Hi All, Vic is probably exactly correct. Assuming this to be the case, the amplifier likely has more than 20 dB of gain. That makes the need for neutralization even greater. Also, depending on how yo; /archives//html/Amps/2015-07/msg00071.html (11,746 bytes)
185. Re: [Amps] SMPS Question (score: 1): Author: Gerald Williamson via Amps <amps@contesting.com>; Date: Tue, 21 Jul 2015 12:42:21 -0400; Hi All, the principle is reducing the plate voltage and current by the same percentage lowers the power input and output while retaining the same plate load impedance. For example, lowering the volta; /archives//html/Amps/2015-07/msg00076.html (8,068 bytes)
186. Re: [Amps] HV transformer and Variac (score: 1): Author: Gerald Williamson via Amps <amps@contesting.com>; Date: Thu, 23 Jul 2015 10:14:00 -0400; Hi Ros, to split hairs here, one would say the autotransformer would loose very little efficiency. As you know, when there is copper wire and there is current, there will be a loss of current squared; /archives//html/Amps/2015-07/msg00104.html (11,534 bytes)
187. [Amps] FS Codan 8528 SSB/AM final amp. (score: 1): Author: John Watkins via Amps <amps@contesting.com>; Date: Thu, 23 Jul 2015 17:03:23 +0000 (UTC); I have a 125 Watt final amplifier from a Codan 8528 HF SSB/AM unit. It uses 2 MRF455s as the final output transistors. It includes the output filters on the board and the TR switching. Also the ma; /archives//html/Amps/2015-07/msg00107.html (8,041 bytes)
188. Re: [Amps] HV transformer and Variac (score: 1): Author: Bryan Swadener via Amps <amps@contesting.com>; Date: Thu, 23 Jul 2015 17:04:12 +0000 (UTC); Thanks to info from Manfred and a former coworker, I rewound a transformer. It wasn't at all difficult, cost was a little over $100 for materials, and I have a multitap transformer that can do easily; /archives//html/Amps/2015-07/msg00108.html (9,383 bytes)
189. Re: [Amps] SMPS Question (score: 1): Author: Gerald Williamson via Amps <amps@contesting.com>; Date: Fri, 24 Jul 2015 12:11:19 -0400; Also in reply to Charlie, re: why not used more often. Back in bygone days we were allowed to run 1 KW power input for cw or 2000 watts input peak input for SSB and other modes. Many, if not most of; /archives//html/Amps/2015-07/msg00114.html (10,463 bytes)
190. Re: [Amps] HV transformer and Variac (score: 1): Author: Gerald Williamson via Amps <amps@contesting.com>; Date: Fri, 24 Jul 2015 12:33:58 -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 mo; /archives//html/Amps/2015-07/msg00115.html (11,875 bytes)
191. Re: [Amps] Odd query.... (score: 1): Author: Gerald Williamson via Amps <amps@contesting.com>; Date: Fri, 24 Jul 2015 15:32:50 -0400; Don't let an arc happen or there will be flames! Learned from experience; don't ask how. Wonder what the dielectric constant of peanut oil might be? 73, Gerald K5GW In a message dated 7/24/2015 2:13:; /archives//html/Amps/2015-07/msg00121.html (8,951 bytes)
192. Re: [Amps] Odd query.... (score: 1): Author: Gerald Williamson via Amps <amps@contesting.com>; Date: Fri, 24 Jul 2015 16:10:40 -0400; Surely you can't be saying there are no turkey fryers up there in the great Northwest! Seriously though, a real Southerner would be using lard in his turkey fryer. No allergy concerns don't you know.; /archives//html/Amps/2015-07/msg00125.html (10,127 bytes)
193. Re: [Amps] Odd query.... (score: 1): Author: Radio WC6W via Amps <amps@contesting.com>; Date: Sat, 25 Jul 2015 13:40:39 -0700; Hi Larry, Back in the 1950's, Hughes created the kilowatt HACON amplifier, for use on the B-58 Bomber, which had 4x 4CX250 family finals, with large finned radiators in lieu of the standard air fins,; /archives//html/Amps/2015-07/msg00133.html (9,413 bytes)
194. Re: [Amps] Time to ask for help. (score: 1): Author: Gerald Williamson via Amps <amps@contesting.com>; Date: Sat, 25 Jul 2015 17:54:31 -0400; Hi Roger, a couple of thoughts come to mind. The 400 mA idle current is problematic. This would not cause an oscillation but it allows the tubes to operate pretty much at maximum gain and that can ma; /archives//html/Amps/2015-07/msg00136.html (11,381 bytes)
195. Re: [Amps] Transmit signal monitoring AM & SSB (score: 1): Author: Bryan Swadener via Amps <amps@contesting.com>; Date: Fri, 31 Jul 2015 18:28:46 +0000 (UTC); I've used a 'scope for a few decades to monitor my transmitted waveform. My impressions of dedicated ham scopes (Heathkit, Yaesu, Kenwood, et al) are that they do the job but, they're pricey and not; /archives//html/Amps/2015-07/msg00189.html (9,820 bytes)
196. [Amps] Alpha 76A 88877 conversion? (score: 1): Author: Scott via Amps <amps@contesting.com>; Date: Mon, 3 Aug 2015 10:29:28 -0400; Has anyone done an Alpha 76A 8877 conversion? I'd be starting with a 2 holer that's been upgraded to a bigger Dahl transformer, been recapped, and otherwise in good shape. I've been looking mine over; /archives//html/Amps/2015-08/msg00000.html (6,754 bytes)
197. Re: [Amps] Alpha 76A 88877 conversion? (score: 1): Author: mike via Amps <amps@contesting.com>; Date: Mon, 3 Aug 2015 11:11:30 -0400; How much high voltage will you have? Has anyone done an Alpha 76A 8877 conversion? I'd be starting with a 2 holer that's been upgraded to a bigger Dahl transformer, been recapped, and otherwise in go; /archives//html/Amps/2015-08/msg00001.html (7,968 bytes)
198. Re: [Amps] Blower noise (score: 1): Author: Russ Williams via Amps <amps@contesting.com>; Date: Wed, 12 Aug 2015 02:13:14 +0000 (UTC); Hello Manfred. I dealt with fan noise a few years ago and got it down to an acceptable level. Looking at what I think is your amplifier (National NCL-2000?) , the fan motor appears to be what I cal; /archives//html/Amps/2015-08/msg00030.html (14,146 bytes)
199. Re: [Amps] Drake L4 PS Plug Needed (score: 1): Author: mike via Amps <amps@contesting.com>; Date: Wed, 12 Aug 2015 07:12:08 -0400; I bought one a year ago from Electronic Surplus Inc. in Mentor Ohio. They have a web site. Been in business forever. Mike Im looking for an 8 pin female power plug that is used to connect the Drake L; /archives//html/Amps/2015-08/msg00036.html (7,874 bytes)
200. Re: [Amps] Ham sells fine grit thing to clean contacts (score: 1): Author: "Andre I. via Amps" <amps@contesting.com>; Date: Mon, 17 Aug 2015 08:16:09 -0700; Subject: Re: [Amps] Ham sells fine grit thing to clean contacts To: amps@contesting.com Date: Monday, August 17, 2015, 10:13 AM Agree David, a "burnishing tool" is designed to clean various electrica; /archives//html/Amps/2015-08/msg00060.html (13,454 bytes)

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