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Total 84 documents matching your query.

41. [Amps] New GS-35B amplifier (score: 1)
Author: robert briggs <vk3zl@bigpond.com>
Date: Mon, 20 Apr 2009 21:30:39 +1000
Hi all, Well I finally have sorted this amplifier out and it is now running fine...I installed it into the shack yesterday and have made a few contacts into US and JA and all works as it should....A
/archives//html/Amps/2009-04/msg00170.html (7,130 bytes)

42. [Amps] filament transformers (score: 1)
Author: robert briggs <vk3zl@bigpond.com>
Date: Sat, 16 May 2009 18:53:07 +1000
What has happened to "roll your own" custom filament transformers? I have never purchased a commercially made filament transformer after building more than 40 amplifiers over 25 years....I still roll
/archives//html/Amps/2009-05/msg00078.html (8,355 bytes)

43. [Amps] filament transformers (score: 1)
Author: robert briggs <vk3zl@bigpond.com>
Date: Sat, 16 May 2009 23:03:41 +1000
You are right Carl...I have always had the roving eye at hamfests and disposal stores..I once brought 5 new Jennings vac variables, 5-500pf for one dollar each at a disposals place...When I took them
/archives//html/Amps/2009-05/msg00083.html (9,062 bytes)

44. [Amps] Toroidal transformers... (score: 1)
Author: robert briggs <vk3zl@bigpond.com>
Date: Tue, 23 Jun 2009 17:49:37 +1000
Hi all..I have been shopping around for custom built Toroidal transformers....My specs are for one rated 250 volts AC input 50CPS....Output 1100VAC @ 1 amp....1100va....I intend to use this unit for
/archives//html/Amps/2009-06/msg00096.html (6,756 bytes)

45. [Amps] Re Toroidal Transformers (score: 1)
Author: robert briggs <vk3zl@bigpond.com>
Date: Fri, 26 Jun 2009 17:00:39 +1000
Thanks to all who have contacted me re Toroidal transformers..I currently have an Antek 2 x 800 volt unit in a 2 meter amplifier using 2 x GI-7BT tubes....That is a standard unit produced by them....
/archives//html/Amps/2009-06/msg00122.html (7,030 bytes)

46. [Amps] Grounded Grid (Screen) 4CX250B power gain (score: 1)
Author: robert briggs <vk3zl@bigpond.com>
Date: Tue, 21 Jul 2009 16:41:45 +1000
I have built 4 amplifiers using the 4CX-250B-350R tubes in the so called "Super Cathode Driven" mode, tying the control grid to the cathode and grounding the screen grid....This design was in some ol
/archives//html/Amps/2009-07/msg00232.html (7,894 bytes)

47. [Amps] Re Grounded grid (Screen) (score: 1)
Author: robert briggs <vk3zl@bigpond.com>
Date: Wed, 22 Jul 2009 13:23:15 +1000
You are probably right Gary...I found the original reference material>> QST July 1967 page 37 and the short reference there was for a 4CX300A, Class B Super-cathode-Driven Service...I havn't found an
/archives//html/Amps/2009-07/msg00267.html (6,549 bytes)

48. [Amps] HV Measuring. (score: 1)
Author: Robert Briggs <vk3zl@bigpond.com>
Date: Mon, 17 Aug 2009 09:12:07 +1000
G'day all....I am probably the dill of the bunch but to measure the HV on my power supplies I measure between the bottom capacitor in the stack and ground...8 capacitors, multiply the result by 8 for
/archives//html/Amps/2009-08/msg00338.html (6,370 bytes)

49. [Amps] Re GS-35B hours.. (score: 1)
Author: Robert Briggs <vk3zl@bigpond.com>
Date: Sat, 19 Dec 2009 14:04:41 +1100
G'day all....I note the comment that 500 hours is probably the useful life for the GS-35B....I have two amplifiers which are turned on and run daily.I use CW only, 160 meters..My original 35B amplifi
/archives//html/Amps/2009-12/msg00472.html (7,884 bytes)

50. [Amps] Good amp to buy maybe build.. (score: 1)
Author: Robert Briggs <vk3zl@bigpond.com>
Date: Sat, 30 Jan 2010 12:39:51 +1100
The best amplifier is the one that you purpose build for yourself from the ground up...There are many pitfalls however for the inexperienced builder...Selecting the right and comparable components fo
/archives//html/Amps/2010-01/msg00475.html (8,040 bytes)

51. [Amps] Building an Amp & Metalworking is an Art. (score: 1)
Author: Robert Briggs <vk3zl@bigpond.com>
Date: Sat, 30 Jan 2010 20:24:27 +1100
Working with aluminum sheet is fairly straight forward.. Actually the secret from my experience is using your head and taking your time at each task...I realise that not everybody is able to do fine
/archives//html/Amps/2010-01/msg00487.html (8,207 bytes)

52. [Amps] Fleamarkets and more.... (score: 1)
Author: Robert Briggs <vk3zl@bigpond.com>
Date: Wed, 03 Feb 2010 09:49:37 +1100
Well, this thread seems to have covered a great range of topics regarding home brew etc...One thing sticks out prominently and that is sourcing of components...In my experience this is not all that h
/archives//html/Amps/2010-02/msg00098.html (7,623 bytes)

53. [Amps] Water cooled 160 meter amplifier.. (score: 1)
Author: Robert Briggs <vk3zl@bigpond.com>
Date: Tue, 09 Feb 2010 10:43:56 +1100
Well, I have finally completed this project...All electronic circuits perform faultlessly...I am using a russian GS-31B in this project...I will later replace it with a GS-35B....Running conditions a
/archives//html/Amps/2010-02/msg00259.html (8,110 bytes)

54. [Amps] Re GI-7B Triodes.. (score: 1)
Author: Robert Briggs <vk3zl@bigpond.com>
Date: Wed, 03 Mar 2010 19:37:59 +1100
Hi all, just a few notes regarding the GI-7B, BT and GI-6B triodes....I am currently running a pair of GI7BT tubes in a homebrew 80-10 meter amplifier....These tubes are little gems particularly if y
/archives//html/Amps/2010-03/msg00059.html (7,565 bytes)

55. [Amps] Good Engineering.. (score: 1)
Author: Robert Briggs <vk3zl@bigpond.com>
Date: Thu, 25 Mar 2010 10:11:29 +1100
I guess it's easy to blowhard all day about good engineering practise if you are an engineer...Maybe some of the advice will rub off on mere radio ham non engineers who want to put together an amplif
/archives//html/Amps/2010-03/msg00591.html (7,615 bytes)

56. [Amps] Radio Handbook... (score: 1)
Author: Robert Briggs <vk3zl@bigpond.com>
Date: Wed, 31 Mar 2010 09:31:17 +1100
G'day all, I have collected most of the The "Radio" Handbooks, by Editors and Engineers from 1937 through to the 23rd edition W6SAI...I have spent countless hours enjoying reading these books especia
/archives//html/Amps/2010-03/msg00901.html (6,885 bytes)

57. [Amps] Liquid cooling (score: 1)
Author: Robert Briggs <vk3zl@bigpond.com>
Date: Tue, 06 Apr 2010 10:18:14 +1000
Good to see more discussion re liquid cooling. However, aside from the merits of various cooling agents, water cooling is probably the simplest and most practical method for the average ham station..
/archives//html/Amps/2010-04/msg00141.html (10,571 bytes)

58. [Amps] 4CX1600B/GU91B (score: 1)
Author: Robert Briggs <vk3zl@bigpond.com>
Date: Fri, 23 Jul 2010 10:19:27 +1000
Try UR4LL Dr Alex Gavva... Bob..VK3ZL.. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2010-07/msg00224.html (6,480 bytes)

59. [Amps] More parasitic questions.. (score: 1)
Author: Robert Briggs <vk3zl@bigpond.com>
Date: Wed, 28 Jul 2010 10:02:22 +1000
Good lord...Hasn't this stuff been flogged to death on here long enough? Constant bickering and arguments about parasitic suppressors just degrade what is usually an informative amplifier site....If
/archives//html/Amps/2010-07/msg00276.html (6,679 bytes)

60. [Amps] Eimac Y730 transmitting tube.. (score: 1)
Author: Robert Briggs <vk3zl@bigpond.com>
Date: Thu, 05 Aug 2010 18:40:37 +1000
Hi All, does anybody have information or data for Eimac tube type Y730 ?? Thanks all....Bob..VK3ZL.. _______________________________________________ Amps mailing list Amps@contesting.com http://lists
/archives//html/Amps/2010-08/msg00041.html (6,259 bytes)

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