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Total 573 documents matching your query.

181. Re: [Amps] Multiple Amplifier Switching Box (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Thu, 23 Aug 2012 20:40:44 -0700
NEVER run amplifier in series! Most amplifiers use RG58 or smaller coax for the input connector to the relay. And as mentioned before, some, like all of mine, use a small 100 watt relay for the input
/archives//html/Amps/2012-08/msg00376.html (10,393 bytes)

182. [Amps] Drake L4B Tuned Input on 10 Meters (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Fri, 24 Aug 2012 21:38:16 -0700
Has anyone modified the Drake L4B tuned input for 10 meters? My amp came stock with 10 meters (an older amp) but the 10 meter input SWR is about 4:1 and adjusting the coil makes little change. Lookin
/archives//html/Amps/2012-08/msg00399.html (7,165 bytes)

183. Re: [Amps] Can some explain this curious eBay auction (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Sat, 25 Aug 2012 08:22:40 -0700
Indeed! It will be interesting to see if they go back on because of a deadbeat bidders. 73 Jim W7RY Many like to play games with audiophools and bid like crazy with no intention of paying. Carl KM1H
/archives//html/Amps/2012-08/msg00405.html (10,118 bytes)

184. Re: [Amps] Vacuum Variable Help Needed (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Sat, 25 Aug 2012 09:45:28 -0700
He is. Talked to him just the other day. 73 Jim W7RY REPLY: You might try Max Gain Systems: http://www.mgs4u.com/president_contents.htm Hopefully, Alan Bond is still working there. He is a very helpf
/archives//html/Amps/2012-08/msg00408.html (9,128 bytes)

185. Re: [Amps] Amplifier Fans: (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Sat, 25 Aug 2012 12:35:24 -0700
Are they DC fans or AC fans? If they are AC fans, they would not produce noise. DC fans have inverters in them to convert DC back to AC for the motor itself. Carl also mentioned the power supply for
/archives//html/Amps/2012-08/msg00415.html (8,314 bytes)

186. Re: [Amps] Small transformer evaluation (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Sat, 1 Sep 2012 17:55:48 -0700
Why not just lift the negative end of the HV bleeder with zenner diodes? If the plate voltage goes away, so does the screen voltage. I hear that screens don't make very good plates? 73 Jim W7RY Some
/archives//html/Amps/2012-09/msg00010.html (9,408 bytes)

187. [Amps] SB-220 QSK Boards are Ready! (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Mon, 3 Sep 2012 19:16:27 -0700
All.... The boards are ready! Just put the final touches on it! BUT the boards I have now are a prototype boards and I only have 8 of them. There is no solder mask or silkscreen on them. I also dont
/archives//html/Amps/2012-09/msg00028.html (8,075 bytes)

188. Re: [Amps] Alpha &&DX Conversion (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Wed, 5 Sep 2012 19:37:06 -0700
Yup! Mee too. I worked on a BEXT 2500 watt transmitter with an 8877. My transmitter was limited to 2200 watts output because of licensing. 24 hours a day! As I remember about 65 or 70 watts from the
/archives//html/Amps/2012-09/msg00074.html (10,482 bytes)

189. [Amps] SB-220 QSK Modification Boards Ready! (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Sat, 15 Sep 2012 12:31:40 -0700
The SB-220 QSK modification circuit board is ready! Pictures here: http://s900.photobucket.com/albums/ac206/w7ry/SB-220%20QSK%20Modifications/ Other details here: http://www.qrz.com/db/w7ry 73 Jim W7
/archives//html/Amps/2012-09/msg00246.html (6,818 bytes)

190. [Amps] QST Article 3-500 Tube Tester (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Sun, 18 Nov 2012 22:01:47 -0800
Can anyone refresh my memory on which QST issue the 3-500 tube tester was in? Ive been looking on the ARRL site and no luck. Thanks! 73 Jim W7RY _______________________________________________ Amps m
/archives//html/Amps/2012-11/msg00125.html (6,574 bytes)

191. [Amps] Ten-Tec Centurion Design Flaw? (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Sun, 2 Dec 2012 21:50:26 -0800
Im working on a Ten-Tec Centurion for a customer. I noticed that the load capacitor padders are not hooked to the band switch correctly. The schematic depicts the way they are actually wired in an ac
/archives//html/Amps/2012-12/msg00007.html (7,986 bytes)

192. [Amps] Plate Transformer Suppliers (score: 1)
Author: Jim W7RY <jimw7ry@gmail.com>
Date: Wed, 16 Oct 2013 20:35:43 -0700
Has anyone had experience with EPD transformers? Pro or con? How do their prices compare? Thanks 73 Jim W7RY _______________________________________________ Amps mailing list Amps@contesting.com http
/archives//html/Amps/2013-10/msg00308.html (6,480 bytes)

193. [Amps] SB-200 and SB-220 Load Caps (score: 1)
Author: "Jim" <jimw7ry@gmail.com>
Date: Wed, 31 Dec 2014 21:07:05 -0800
Is the older 2 section loading cap in the SB200 the same as the older loading cap in the SB220?. SB-200 part number is 26-97. I dont have an old SB220 manual to look at the parts list... Nor did I fi
/archives//html/Amps/2015-01/msg00005.html (6,719 bytes)

194. [Amps] Single Band Amplifiers One Power Supply (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Wed, 19 Oct 2016 18:47:05 -0500
Im going to be setting up single band amplifiers for a contest station. How would you go about metering them? They will use an 8877 tube. Currently the amplifiers have Ians (GM3SEK) triode boards in
/archives//html/Amps/2016-10/msg00092.html (7,360 bytes)

195. Re: [Amps] Chimney for GS35B (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Sat, 29 Oct 2016 07:03:49 -0500
Most good hose outlets have silicone turbocharger hose too. The ones shops that make custom hydraulic hoses usually have it. I got mine from House of Hose in Spokane Valley Washington. 73 Jim W7RY Mi
/archives//html/Amps/2016-10/msg00143.html (9,199 bytes)

196. Re: [Amps] 3 phase HV transformers on single phase (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Sat, 29 Oct 2016 07:08:17 -0500
If were me using this, I would simply cut off the bad or un-needed part of the core. 73 Jim W7RY 27/10/2016 13:47 How inefficient would running a 3 phase, three bobbin transformer (7kV @ £ Amps on 3
/archives//html/Amps/2016-10/msg00144.html (8,726 bytes)

197. [Amps] 8877 Grid Connection DC or Not (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Mon, 28 Nov 2016 21:00:21 -0600
Has anyone run the grid of an 8877 not connected to ground as far as DC is concerned? I really need to meter the grid current by bypassing the grid to ground with capacitors and several 10 ohm resist
/archives//html/Amps/2016-11/msg00155.html (6,717 bytes)

198. Re: [Amps] 8877 Grid Connection DC or Not (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Tue, 29 Nov 2016 17:37:27 -0600
Marv... Because this will be a single power supply and multiple RF deck (5 or 6 of them) amplifier system for a contest station. I dont want to use vacuum relays as high voltage switches. Metering pl
/archives//html/Amps/2016-11/msg00164.html (9,180 bytes)

199. Re: [Amps] 8877 Grid Connection DC or Not (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Tue, 29 Nov 2016 18:38:57 -0600
Thanks Ian.. I'll add it to the several versions of your board info that I already have and use. I know how amplifier metering works. This is a special application. 73 Jim W7RY This reference, page 3
/archives//html/Amps/2016-11/msg00166.html (10,365 bytes)

200. Re: [Amps] A cheer for the SPE 2K (score: 1)
Author: "Jim W7RY" <jimw7ry@gmail.com>
Date: Tue, 29 Nov 2016 20:56:01 -0600
1 amp transformer is only $400.00. My power supplies run RTTY contests at 1500 watts no issues. 73 Jim W7RY Very few amps will run legal limit on 100% duty cycle RTTY! I don't think I'd want to pay f
/archives//html/Amps/2016-11/msg00169.html (8,064 bytes)

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