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1. Re: [Amps] High SWR, (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Thu, 23 Apr 2009 21:48:08 +0800
Nobody is attacking you Scott. "Kurt N Sturba" has written on the the topic of this thread many times over in World Radio Magazine. Seek it out. It is good reading. Simple, to the point, easy to unde
/archives//html/Amps/2009-04/msg00252.html (17,019 bytes)

2. Re: [Amps] SWR & OPEN WIRE (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Fri, 24 Apr 2009 10:10:13 +0800
snip Yeah, that's dead right. You match the source impedance (amplifier output) to the load impedance (coax, tuner or whatever) and maximum power transfer takes place. That's all you need to worry ab
/archives//html/Amps/2009-04/msg00301.html (7,402 bytes)

3. Re: [Amps] High SWR (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Sat, 25 Apr 2009 06:52:20 +0800
Don't confuse impedance with resonance,front to back ratio or gain. They are all completely separate parameters. Interrelated but separate and not appropriate discussion matter on this forum. Alek, V
/archives//html/Amps/2009-04/msg00324.html (13,733 bytes)

4. Re: [Amps] FL2100B questions (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Mon, 11 May 2009 06:07:59 +0800
Hi Jerome, Very common symptom with the FL-2100B. It is the 40m input tuning network capacitor/s. They are nice big brown, heavy duty looking iems but they are known for their high failure rate. I do
/archives//html/Amps/2009-05/msg00055.html (9,676 bytes)

5. Re: [Amps] filament transformers (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Sat, 16 May 2009 07:08:26 +0800
Go for a larger one as the "off the shelf" transformers most likely are NOT rated for continuous duty at the nominal 3A or 4A. In other words, they'll probably cook when put into service as a filamen
/archives//html/Amps/2009-05/msg00072.html (9,449 bytes)

6. Re: [Amps] filament transformers (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Sat, 16 May 2009 20:54:16 +0800
That's because you guys in the US have greater access to many things amplifiers. The rest of the world has to make do and adapt what is available or pay a premium price for what you guys throw out as
/archives//html/Amps/2009-05/msg00082.html (9,027 bytes)

7. Re: [Amps] Doorknob Caps Needed (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Thu, 28 May 2009 06:00:05 +0800
Yes, they are good sources if you have lots of money to spend. If not, a better option might be UR4LL on the ND2X website. http://www.nd2x.net/ur4ll.html Dr Alex is excellent to deal with. 73, Alek V
/archives//html/Amps/2009-05/msg00222.html (9,177 bytes)

8. Re: [Amps] Doorknob Caps Needed (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Thu, 28 May 2009 07:09:13 +0800
Yep, try Dr Alex. You can chat to him and do the deal in real time on Skype. Very friendly service. 73, Alek. http://www.qrz.com/vk6apk http://www.qrz.com/vk6py ______________________________________
/archives//html/Amps/2009-05/msg00225.html (9,463 bytes)

9. Re: [Amps] TL922 rocker switch (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Fri, 29 May 2009 09:39:11 +0800
I used an old rocker (no, not Mick Jagger) from a computer. The fine ribs are horizontal instead of vertical like the original but It all works ok and has done so for the last 10 years or so. 73, Ale
/archives//html/Amps/2009-05/msg00252.html (8,059 bytes)

10. Re: [Amps] 3-500Z's: Brand ??, (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Wed, 10 Jun 2009 08:33:58 +0800
Dead right, I've been using Chinese generics, sourced for me by Hsu, (a member of this list) for quite a number of years now. They are extremely robust and they run as good as the day they were insta
/archives//html/Amps/2009-06/msg00039.html (8,114 bytes)

11. Re: [Amps] Titan quits query (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Wed, 24 Jun 2009 19:31:09 +0800
Talk to Sam and/or Martin. They should be able to sort it. 73, Alek VK6APK http://www.qrz.com/vk6apk http://www.qrz.com/vk6py _______________________________________________ Amps mailing list Amps@co
/archives//html/Amps/2009-06/msg00108.html (8,185 bytes)

12. Re: [Amps] 'gettering 572B' (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Fri, 26 Jun 2009 06:19:36 +0800
Ha ha. Try 7.1V for the AL-811H. No wonder there's such a good market for 811A and 572B tubes here in Australia. 73, Alek VK6APK http://www.qrz.com/vk6apk http://www.qrz.com/vk6py ___________________
/archives//html/Amps/2009-06/msg00120.html (8,144 bytes)

13. Re: [Amps] 4-1000A in LK2000 (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Sat, 04 Jul 2009 16:09:34 +0800
It gets grounded as well. I was actually going to suggest that he checks that all 3 grid pins on the socket are grounded. I guess if they weren't, (screen not grounded) then he would see no output at
/archives//html/Amps/2009-07/msg00087.html (9,719 bytes)

14. Re: [Amps] 6 Meter Amplifier (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Mon, 13 Jul 2009 08:46:50 +0930
Yeah, it was too subtle for this dumb Aussie as well. Alek. VK6APK _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/a
/archives//html/Amps/2009-07/msg00165.html (8,312 bytes)

15. Re: [Amps] 6 Meter Amplifier (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Mon, 13 Jul 2009 17:19:46 +0930
Ha ha. thanks for that. I should have got it first up. I'm on holiday in VK5 and brain is in neutral. 73, Alek VK6APK/5 _______________________________________________ Amps mailing list Amps@contesti
/archives//html/Amps/2009-07/msg00172.html (9,280 bytes)

16. Re: [Amps] Eimac AS newsletters (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Sat, 01 Aug 2009 14:21:25 +0800
Heathkit manuals are a no no. For the full story, check out BAMA. 73, Alek VK6APK http://www.qrz.com/vk6apk http://www.qrz.com/vk6py _______________________________________________ Amps mailing list
/archives//html/Amps/2009-07/msg00465.html (11,446 bytes)

17. Re: [Amps] 3-500Z viable after long storage? (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Mon, 10 Aug 2009 14:46:55 +0800
G'day Jim, From what I understand about 3-500Z tubes and the like, the only way to getter them is to get them working with colour. Just running the filaments will achieve nothing. Therefore I say, ju
/archives//html/Amps/2009-08/msg00207.html (9,441 bytes)

18. Re: [Amps] HV Measuring. (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Mon, 17 Aug 2009 13:40:21 +0800
I've always used a junk box transformer and fed the 5V or 6.3V AC secondary into the primary of the hv transformer / dc supply and measured the exact AC input and the exact DC output. I then measure
/archives//html/Amps/2009-08/msg00342.html (9,349 bytes)

19. Re: [Amps] [Heathkit] The SB-220 (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Sun, 23 Aug 2009 08:59:34 +0800
My experiences are similar to your's. In every amplifier that I have installed Nichrome, whether commercially made or home brew, the change has been very noticeable. I don't care who invented the ide
/archives//html/Amps/2009-08/msg00399.html (11,669 bytes)

20. Re: [Amps] Design VS parasitic (score: 1)
Author: Alek Petkovic <vk6apk@bigpond.com>
Date: Tue, 25 Aug 2009 07:08:31 +0800
On the contrary Jack. The wire is comparable in diameter to 20 Amp fuse wire so I don't believe 1A plate current will present any problems. 73, Alek VK6APK http://www.qrz.com/vk6apk http://www.qrz.co
/archives//html/Amps/2009-08/msg00471.html (12,167 bytes)


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