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1. [Amps] 807s (score: 1)
Author: "Barry Kirkwood" <barry.kirkwood@gmail.com>
Date: Sun, 29 Jul 2007 21:26:13 +0000
Nostalgia! the 6L6 beam tetrode hit the market around 1936 and soon after the works were packaged in a glass envelope with top cap and a 5pin base for RF use and designated 807. II recall a bit of in
/archives//html/Amps/2007-07/msg00512.html (8,045 bytes)

2. [Amps] Tetrode Screen Supplies (score: 1)
Author: "Barry Kirkwood" <barry.kirkwood@gmail.com>
Date: Thu, 13 Sep 2007 03:04:25 +0000
See the PA0FRI website, GU-74B project. Am impressed by the simplicity and elegance of the screen supply. Uses "constant current" feed : voltage dropped via tungsten lamp to shunt regulator. Any comm
/archives//html/Amps/2007-09/msg00132.html (6,443 bytes)

3. [Amps] Homebrew Amp design. (score: 1)
Author: "Barry Kirkwood" <barry.kirkwood@gmail.com>
Date: Mon, 8 Oct 2007 04:06:14 +0000
Re enquiry about design for home made 1kW plus hf amp: Something of a work in progress, but suggest looking at Gu-74 amp project on PA0FRI web site. Low parts count, inexpensive parts, few critical a
/archives//html/Amps/2007-10/msg00079.html (6,649 bytes)

4. [Amps] Home built Amp Design - Correction. (score: 1)
Author: "Barry Kirkwood" <barry.kirkwood@gmail.com>
Date: Mon, 8 Oct 2007 14:20:46 +0000
Sorry, the PA0FRI amp project used GU-43b, but am sure would translate to Gu-84 etc. The web address: www.pa0fri.geerligs.com The Gu-43 project seems an excellent place to go for ideas on a reasonabl
/archives//html/Amps/2007-10/msg00081.html (6,593 bytes)

5. [Amps] Trimming the transmission line (score: 1)
Author: "Barry Kirkwood" <barry.kirkwood@gmail.com>
Date: Thu, 11 Oct 2007 23:30:38 +0000
Have I got it wrong? As I see it: True: Changing the length of a transmission line will not change the SWR. True: It the SWR is other than !:1, trimming the line may bring one to a point where there
/archives//html/Amps/2007-10/msg00143.html (6,715 bytes)

6. [Amps] Tom W8JI (score: 1)
Author: "Barry Kirkwood" <barry.kirkwood@gmail.com>
Date: Sat, 10 Nov 2007 12:09:06 +0700
Sorry if Tom has left this group, but can understand why. This Kiwi would like to express his gratitude and appreciation for Tom's contribution to this reflector and to amateur radio generally. Thank
/archives//html/Amps/2007-11/msg00126.html (6,822 bytes)

7. [Amps] Over running modulation /AF transformers (score: 1)
Author: "Barry Kirkwood" <barry.kirkwood@gmail.com>
Date: Sat, 10 Nov 2007 21:10:55 +0000
Usually easy. First limiting factor is power at lower audio frequency. If for speech only, simply ensure a falling frequency response below say 800Hz, with lots of attenuation below 200Hz or so. 73 B
/archives//html/Amps/2007-11/msg00137.html (6,603 bytes)

8. [Amps] 3 kV switch mode supply (score: 1)
Author: "Barry Kirkwood" <barry.kirkwood@gmail.com>
Date: Thu, 10 Jan 2008 00:37:42 +0000
Am looking for in a light weight switch mode 230 vac in power supply suitable for 2x 3-500Z amp. Would appreciate any info about sources, websites etc. tnx es 73 Barry ZL1DD -- Barry Kirkwood PhD ZL1
/archives//html/Amps/2008-01/msg00090.html (6,420 bytes)

9. [Amps] Drake L-4B Power Supply Buzz (score: 1)
Author: "Barry Kirkwood" <barry.kirkwood@gmail.com>
Date: Sun, 24 Feb 2008 03:04:46 +0000
Drake L series amps are excellent. Would advise hanging on to it. If you must sell it cheap, sell it to me. Will pay shipping on rf deck, you can keep power supply. Things I can be dogmatic about: 1.
/archives//html/Amps/2008-02/msg00165.html (9,535 bytes)

10. [Amps] 60 Hz vs 50hz (score: 1)
Author: "Barry Kirkwood" <barry.kirkwood@gmail.com>
Date: Sun, 9 Mar 2008 04:04:53 +0000
Once upon a time, before they devoted all there waking hours to manufacturing dubious financial products, the inhabitants of North America build real tangible things for people to use. And the best o
/archives//html/Amps/2008-03/msg00086.html (8,071 bytes)

11. [Amps] HF Amps Lore (score: 1)
Author: "Barry Kirkwood" <barry.kirkwood@gmail.com>
Date: Sat, 29 Mar 2008 07:29:06 +0000
There are lots of good sources out there. For anybody interested in building or refurbishing HF amps, checkout PA0FRI on Google. One of the best resources I know. 73 Baz ZL1DD -- Barry Kirkwood PhD Z
/archives//html/Amps/2008-03/msg00331.html (6,461 bytes)

12. [Amps] Cleaning amps and stuff (score: 1)
Author: "Barry Kirkwood" <barry.kirkwood@gmail.com>
Date: Sat, 31 May 2008 23:27:51 +0000
Remove tubes and meters etc. Remove transformers. Place in dishwasher. Do not use normal dish washing detergent (corrosive), use Tepol or other soft type. Run normal dish wash cycle. Can be done with
/archives//html/Amps/2008-05/msg00227.html (6,791 bytes)

13. [Amps] High voltage wire (score: 1)
Author: "Barry Kirkwood" <barry.kirkwood@gmail.com>
Date: Tue, 23 Dec 2008 09:49:21 +0000
FWIW: Things I have done that worked and did not kill anyone, but may not be best practice: 1. Made gruntier external power supply for Drake L-4. Used the original large Jones plug, ran the HT in hea
/archives//html/Amps/2008-12/msg00298.html (6,993 bytes)

14. [Amps] drake l-7 power supply (score: 1)
Author: "Barry Kirkwood" <barry.kirkwood@gmail.com>
Date: Thu, 25 Dec 2008 14:07:09 +0000
If my memory is correct the 0.8 ohm or whatever is part of the metering circuitry, not a glitch resistor. 73 Barry ZL1DD -- Barry Kirkwood PhD ZL1DD barry.kirkwood@gmail.com NZ: 021 160 8999 Thailand
/archives//html/Amps/2008-12/msg00325.html (6,663 bytes)

15. Re: [Amps] drake l-7 power supply (score: 1)
Author: "Barry Kirkwood" <barry.kirkwood@gmail.com>
Date: Fri, 26 Dec 2008 01:39:14 +0000
Sorry, Should not have commented without circuit in front of me. 73 Barry ZL1DD -- Barry Kirkwood PhD ZL1DD barry.kirkwood@gmail.com NZ: 021 160 8999 Thailand 081 235 1556 ___________________________
/archives//html/Amps/2008-12/msg00334.html (8,698 bytes)

16. [Amps] Drake L-4 Power supply (score: 1)
Author: Barry Kirkwood <barry.kirkwood@gmail.com>
Date: Wed, 4 Feb 2009 17:56:12 +0000
Years back I bought a second hand L-4 with dried out filter caps and a tired looking transformer. Scrounged around junk sales and built a new power supply full wave bridge, slightly higher plate volt
/archives//html/Amps/2009-02/msg00079.html (6,977 bytes)

17. [Amps] Three phase transformer on single phase (score: 1)
Author: Barry Kirkwood <barry.kirkwood@gmail.com>
Date: Tue, 5 May 2009 02:03:30 +0000
I would value any opinions or reports of experience running three phase transformers on single phase main supply. We are talking about transformers with capability suitable for amateur tube amplifier
/archives//html/Amps/2009-05/msg00008.html (7,340 bytes)

18. [Amps] Dead HT Transformer (score: 1)
Author: Barry Kirkwood <barry.kirkwood@gmail.com>
Date: Mon, 10 Aug 2009 05:33:23 +0000
Hello all, Maybe a dead issue, but a few days back there was discussion on replacing HT transformer for a Henry amp. Was surprised nobody suggested repairing existing transformer. Not a big deal, unl
/archives//html/Amps/2009-08/msg00200.html (7,455 bytes)

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