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Total 480 documents matching your query.

141. Re: [Amps] Clipperton L suggestion (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Mon, 01 Nov 2010 05:45:37 +0800
G'day Larry That Ameritron plate choke comes with the wire at the top, tinned but not soldered. Make sure you didn't forget to solder it and make sure the soldered joint is sound. I put the same chok
/archives//html/Amps/2010-10/msg00493.html (12,787 bytes)

142. Re: [Amps] our amplifier in 2010 CQWW (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Tue, 09 Nov 2010 15:50:12 +0800
As well as all the other home brew amps that have tubes with handles. 2.5kW whether legal or not, is flea power when put against what we hear on the bands during every big contest. Those big amps are
/archives//html/Amps/2010-11/msg00075.html (14,455 bytes)

143. Re: [Amps] our amplifier in 2010 CQWW (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Wed, 10 Nov 2010 06:02:31 +0800
What? All of them? Who's gonna find them all and visit their stations all around the world, all on one weekend? Who's gonna book the flights and pay for the hotels, train tickets and taxis to send an
/archives//html/Amps/2010-11/msg00108.html (19,399 bytes)

144. [Amps] Those Amps. Those Videos (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Wed, 10 Nov 2010 15:33:18 +0800
I just watched the Chinese videos. They would not load over the last couple of days because of traffic and just now is the first time I've been able to watch them. I don't see what all the fuss is ab
/archives//html/Amps/2010-11/msg00136.html (7,528 bytes)

145. Re: [Amps] 2010 ARRL Handbook (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Sat, 13 Nov 2010 07:26:13 +0800
Pretty sure the 2010 edition still features the amp using the unobtainable 4CX1600B (GU91B) tube. Woulda thought they'd go with a tube that is available. 73, Alek. From sunny Binningup, Western Austr
/archives//html/Amps/2010-11/msg00171.html (8,907 bytes)

146. Re: [Amps] Toshiba tube 7f41R (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Mon, 15 Nov 2010 06:53:37 +0800
From http://homepage2.nifty.com/kawoyama/tubestorymetalseramictransmittigtube.html Filament, 6.0V/53A Max Frequency, 250MHz Max Plate V, 4000V Max Screen V, 1000V Max Plate Current, 2.0A Max Plate Di
/archives//html/Amps/2010-11/msg00226.html (7,973 bytes)

147. Re: [Amps] Toshiba tube 7f41R (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Mon, 15 Nov 2010 06:59:06 +0800
Of course its Japanese, not Chinese. Sorry Hsu. Last 3 columns are Anode output power, length, diameter. 73, Alek. http://www.qrz.com/db/vk6apk http://www.qrz.com/db/vk6ap ___________________________
/archives//html/Amps/2010-11/msg00229.html (9,309 bytes)

148. Re: [Amps] Tube Cooling.. (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Thu, 25 Nov 2010 18:59:08 +0800
Ask Dr Alex. He gets them from time to time. I asked him for a pair and a week or two later he let me know that he had them. I sent him the loot and he sent me the sockets. His prices are quite often
/archives//html/Amps/2010-11/msg00433.html (8,190 bytes)

149. Re: [Amps] Help identifying tubes (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Mon, 29 Nov 2010 16:15:53 +0800
You should be able to tell with an ohm meter. The filament pins are easy to identify. They are the same for the triode, tetrode and pentode. If it is a triode, the 3 other pins will have 0 Ohms betwe
/archives//html/Amps/2010-11/msg00538.html (9,563 bytes)

150. Re: [Amps] Help identifying tubes (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Thu, 02 Dec 2010 04:05:39 +0800
Well, I'll be. . . . . Thanks for that, Alek. VK6APK http://www.qrz.com/db/vk6apk http://www.qrz.com/db/vk6ap _______________________________________________ Amps mailing list Amps@contesting.com htt
/archives//html/Amps/2010-12/msg00001.html (12,313 bytes)

151. Re: [Amps] Replacement tube for 4-1000a (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Mon, 20 Dec 2010 06:00:36 +0800
Look at http://www.nd2x.net/base-1.html and scroll to the bottom and hit the "tube prep" button. Alternatively, just mount the tube socket in a box and poke a blower in the side and mount the filamen
/archives//html/Amps/2010-12/msg00259.html (8,702 bytes)

152. Re: [Amps] Replacement tube for a 4-1000a (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Mon, 20 Dec 2010 07:20:32 +0800
I think that is correct Dennis. With heater type tubes, the gettering is done with just the heater running. With filament type tubes, you gotta run the grunt to getter them. 73, Alek. http://www.qrz.
/archives//html/Amps/2010-12/msg00262.html (7,757 bytes)

153. Re: [Amps] TenTec Centurion - 422 tuning question (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Fri, 24 Dec 2010 06:53:24 +0800
Confusing indeed. I noticed the same thing with the Emtron DX-2SP at my club. Turning the knob to the right increases capacitance. I guess it doesn't really matter a great deal. It is just unconventi
/archives//html/Amps/2010-12/msg00324.html (11,212 bytes)

154. Re: [Amps] GS35B Needed (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Thu, 30 Dec 2010 10:14:31 +0800
Just buy 'em from Dr Alex and be done with it. Profits from his sales finance much needed health programmes at the hospital that he runs. http://www.nd2x.net/ur4ll.html 73, Alek VK6APK From sunny Bin
/archives//html/Amps/2010-12/msg00412.html (9,569 bytes)

155. Re: [Amps] 572Bs (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Thu, 20 Jan 2011 06:21:19 +0800
That's certainly different to my experience Mitch. The 200+, Shuguang (Chinese) 572B, that I have bought direct from China and onsold to hams in VK have been absolutely superb. I have had just 2 fail
/archives//html/Amps/2011-01/msg00188.html (11,631 bytes)

156. Re: [Amps] 572Bs (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Thu, 20 Jan 2011 06:57:57 +0800
My pleasure Mitch I get mine from a supplier in China but you can get them from the guy below at exactly the same prices. I have bought from him also and I believe that Carl, KM1H has dealt with him
/archives//html/Amps/2011-01/msg00190.html (16,960 bytes)

157. Re: [Amps] AL-811 & 572's (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Sat, 22 Jan 2011 04:41:10 +0800
The transformer is the limiting factor just as much as the tubes. You can't run the 572Bs any harder because you'll just cook the transformer. 73, Alek VK6APK From sunny Binningup, Western Australia
/archives//html/Amps/2011-01/msg00220.html (8,922 bytes)

158. Re: [Amps] What to buy? (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Thu, 27 Jan 2011 05:49:52 +0800
Well, If I were getting "some other box", high on my list would be the Emtron DX-2SP with the FU728F tube supplied and the option of being able to plug and play a 4CX1500B into in lieu of it, if desi
/archives//html/Amps/2011-01/msg00330.html (8,371 bytes)

159. Re: [Amps] GI-46B in TL-922 (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Thu, 27 Jan 2011 08:48:14 +0800
that's right. The heatsinks are interchangeable but the 46 tube is substantially bigger than the 7. The GI46b is more often sold without the cooler as they seem to be more plentiful like that. They a
/archives//html/Amps/2011-01/msg00340.html (14,153 bytes)

160. Re: [Amps] What to buy? (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Thu, 27 Jan 2011 09:17:11 +0800
You're obviously not worried about obsolete tubes then? I have a Emtron DX-2 which runs the Svetlana 4CX1600B (GU91B). It is unobtainium. The GU78 and GU84B have all but gone the same way. I would st
/archives//html/Amps/2011-01/msg00343.html (12,278 bytes)

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