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241. Re: [Amps] Fwd: Ameritron AL-82/1200/1500 amps mis-wired! (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Mon, 14 Oct 2013 20:15:22 +0800
Well done Lou. I find it enough of a challenge actually reading the Ameritron circuits, let alone verifying if the wiring is correct. Dunno why they can't use normal circuit drawing techniques. Its p
/archives//html/Amps/2013-10/msg00220.html (15,753 bytes)

242. Re: [Amps] More on two pin 220vac (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Tue, 15 Oct 2013 09:36:10 +0800
Well, it appears to me, that the authorities in Thailand, who decide this stuff: 1. Are well aware of the situation you describe. 2. Think that life is cheap in Thailand. So therefore: 3. They don't
/archives//html/Amps/2013-10/msg00244.html (9,313 bytes)

243. Re: [Amps] where to begin (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Fri, 08 Nov 2013 05:34:38 +0800
As is http://somis.org/ 73, Alek VK6APK On 8/11/2013 12:50 AM, Ulf (SM0NOR) wrote: Gustavo, The ARRL 2013 is a very good source. Even better is William Orr's The Radio Handbook. The design chapters a
/archives//html/Amps/2013-11/msg00111.html (14,268 bytes)

244. Re: [Amps] where to begin (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Fri, 08 Nov 2013 06:35:16 +0800
Ha ha. I don't think so mate. 73, Alek. Only if one is already technically competent to know the difference between sound engineering principles and snake oil. That web site is full of traps for the
/archives//html/Amps/2013-11/msg00115.html (15,820 bytes)

245. Re: [Amps] where to begin (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Fri, 08 Nov 2013 06:44:33 +0800
Maybe so but I have yet to find a more comprehensive, educational and useful site, when it comes to building of amplifiers. Whether you believe in Nichrome or not, the content of Rich's site is secon
/archives//html/Amps/2013-11/msg00118.html (16,521 bytes)

246. Re: [Amps] AL-1500 fan speed switching (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Fri, 08 Nov 2013 08:58:46 +0800
The AL-1500 does come with a chimney. It is glass. Yours may have been broken by a previous owner and never replaced. I bought my AL-1500 second hand and the guy shipped it with the tube installed. N
/archives//html/Amps/2013-11/msg00130.html (11,819 bytes)

247. Re: [Amps] Ameritron AL-80A Restoration Project - need parts (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Mon, 18 Nov 2013 06:37:21 +0800
All available from http://www.ameritron.com/ 73, Alek. VK6APK All are available new from MFJ at what I would consider a reasonable price .Morrie I acquired a "basket case" AL-80A. Actually it really
/archives//html/Amps/2013-11/msg00360.html (8,958 bytes)

248. Re: [Amps] GS-35b Amplifier (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Sat, 30 Nov 2013 05:52:08 +0800
Hello Nuno. I think you can do much better with the socket. You can get one where you simply plug the tube in. No rings, clamps or screws. Look at http://www.ebay.com.au/itm/NEW-GS35B-GS31B-A-Tube-so
/archives//html/Amps/2013-11/msg00439.html (9,886 bytes)

249. Re: [Amps]  negative screen current (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Tue, 31 Dec 2013 09:04:08 +0800
Are you positive? Alek. VK6APK Yes, and the electrons, frightened and confused, and not knowing which way is up, run in the opposite direction to the power supply or in the general direction of a low
/archives//html/Amps/2013-12/msg00208.html (10,785 bytes)

250. Re: [Amps] Fake and Counterfeit Chinese Transistors 2SC3133 (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Tue, 31 Dec 2013 10:05:34 +0800
Removed, destroyed, refurbished, sandblasted and restamped. Normal practice for RF transistors in that part of the world. Tell 'em what you need and they'll stamp 'em withe the appropriate numbers. E
/archives//html/Amps/2013-12/msg00212.html (8,485 bytes)

251. Re: [Amps] Freescale (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Fri, 03 Jan 2014 05:36:34 +0800
Bit unfortunate, that. With valves, you can have them rebuilt. Ain't seen anybody that can get the smoke back into transistors. 73, Alek. VK6APK So it looks like only the shipping packaging has chang
/archives//html/Amps/2014-01/msg00010.html (7,630 bytes)

252. Re: [Amps] Freescale (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Sat, 04 Jan 2014 09:08:22 +0800
Wow! Now I've heard it all. That's amazing stuff. I guess need always finds a way.to get the job done. 73 from the other side of the South Pole. (short path) Alek. VK6APK With valves, you can have th
/archives//html/Amps/2014-01/msg00025.html (9,251 bytes)

253. Re: [Amps] Russian HV Supply Capacitors (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Fri, 10 Jan 2014 05:12:55 +0800
If you are going that way, why wouldn't you buy them from Dr Alex? A lot cheaper and the profits go to help fund his local hospital. See http://www.ur4ll.net/#caps1 73, Alek VK6APK http://www.ebay.co
/archives//html/Amps/2014-01/msg00039.html (9,022 bytes)

254. Re: [Amps] 811H pops fuses (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Tue, 21 Jan 2014 06:38:51 +0800
Yeah, that's right Tom. Its the same with the AL-1500 model. More caps, higher voltage but they are still right on or over the limit of 450V per cap. I changed mine for higher value, 500V jobs. I was
/archives//html/Amps/2014-01/msg00187.html (11,005 bytes)

255. Re: [Amps] 811H pops fuses (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Tue, 21 Jan 2014 06:49:05 +0800
Here in VK6, the power company usually exceeds the nominal 240V AC mains voltage so, even when the Ameritron is set on its highest voltage tap, the HV is higher than specified in the manual and highe
/archives//html/Amps/2014-01/msg00188.html (11,148 bytes)

256. Re: [Amps] 811H pops fuses (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Tue, 21 Jan 2014 06:51:38 +0800
Found the caps I bought. See Ebay item number 190875604650 73, Alek VK6APK Its the same with the AL-1500 model. More caps, higher voltage but they are still right on or over the limit of 450V per cap
/archives//html/Amps/2014-01/msg00189.html (11,219 bytes)

257. Re: [Amps] 811H pops fuses (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Tue, 21 Jan 2014 12:22:22 +0800
No, that's K4POZ on qth.com. He was good friends with W4ZT (SK) and is apparently selling his stocks. I believe that they are good quality caps. 73, Alek VK6APK 73 Jim W7RY Carl KM1H Found the caps I
/archives//html/Amps/2014-01/msg00201.html (12,640 bytes)

258. Re: [Amps] Chinese Capacitors (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Tue, 21 Jan 2014 12:28:18 +0800
Well, its probably similar to me selling Chinese 1000uF and 470uF, 450V/105°C caps and I'm in the mega metropolis of Binningup, Western Australia. I just buy'em in bulk and resell them at a small mar
/archives//html/Amps/2014-01/msg00202.html (10,638 bytes)

259. Re: [Amps] AL-811H popping fuses (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Sat, 01 Feb 2014 05:36:50 +0800
Yep. A very frustrating amp to work on. They desperately need a removable cover below the tube socket area. Getting to anything on that control board is a mission as well. Not a nice machine to work
/archives//html/Amps/2014-01/msg00351.html (8,774 bytes)

260. Re: [Amps] 3CX1500A7 versus 3CPX1500A7 (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Mon, 10 Feb 2014 05:26:22 +0800
Ha! You reckon that's bad? Put your meter probes in under the tube sockets and measure the filament voltage. That's a real eye opener! 73, Alek. VK6APK Unless you have a variac in line, I bet it's no
/archives//html/Amps/2014-02/msg00064.html (9,125 bytes)

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