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41. [Amps] TB5/2500 options (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Fri, 20 Nov 2015 09:57:41 +1300; There's one of these tubes available locally. Would anyone like to speculate on what it might do? http://frank.pocnet.net/sheets/030/t/TB5-2500.pdf _______________________________________________ Amp; /archives//html/Amps/2015-11/msg00126.html (6,393 bytes)
42. [Amps] Tube Amps and AM (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Tue, 24 Nov 2015 07:48:47 +1300; If you try it, initially be real sensitive of the heat build up while operating, especially if [snip] I have a TL-922A and I run a TS-2000 into on AM - all knobs to the right on 40M! I'm not joking a; /archives//html/Amps/2015-11/msg00147.html (7,935 bytes)
43. Re: [Amps] Ugly Amps (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Wed, 2 Dec 2015 15:09:32 +1300; Verrry nice! How is the cooling working out? Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2015-12/msg00006.html (7,134 bytes)
44. Re: [Amps] Amps Digest, Vol 156, Issue 9 (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Sat, 19 Dec 2015 08:17:17 +1300; who cares? Buy another one! To subscribe or unsubscribe via the World Wide Web, visit http://lists.contesting.com/mailman/listinfo/amps or, via email, send a message with subject or body 'help' to am; /archives//html/Amps/2015-12/msg00032.html (10,230 bytes)
45. [Amps] 2M GS-35b Anode impedance (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Tue, 22 Dec 2015 15:31:43 +1300; Gurus! I see a wide variation in anode volts on GS-35b designs. The pattern seems to be lower Va on VHF, higher Va on HF. A trend I see, is lower gain on lower Va (2200Va/10dB) and higher gain (4000V; /archives//html/Amps/2015-12/msg00043.html (7,538 bytes)
46. Re: [Amps] 2M GS-35b Anode impedance (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Thu, 24 Dec 2015 17:15:07 +1300; Thanks EVERYONE for your help! Steve 3650 VDC is a good voltage. Anything up to 4000 is routine. You're right that gain depends strongly on voltage. I built a 432 amp with a bit under 3000v at load a; /archives//html/Amps/2015-12/msg00057.html (9,096 bytes)
47. Re: [Amps] HV Transformer (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Thu, 4 Feb 2016 12:42:14 +1300; Yeah it's not that it's difficult, it's just time consuming and some thinking ahead is required. You will be cutting up bits of wood and drilling holes to make mandrels, and so on. It's all just plai; /archives//html/Amps/2016-02/msg00024.html (9,581 bytes)
48. [Amps] Ceramic tube temp too low? (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Mon, 14 Mar 2016 21:46:45 +1300; I am thinking of liquid cooling VHF/UHF GS-35b tubes to dodge noisy fans and and tuning drift. But what will be the situation with operating these tubes at lower temperatures? I cannot see that they; /archives//html/Amps/2016-03/msg00027.html (6,583 bytes)
49. [Amps] Russia tube freight (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Sun, 27 Mar 2016 22:44:18 +1300; Has anyone had problems with freight going missing out of Russia? I have a GS-35b two months overdue - looks like it's gone. Steve _______________________________________________ Amps mailing list Am; /archives//html/Amps/2016-03/msg00039.html (6,288 bytes)
50. Re: [Amps] Russia tube freight (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Tue, 29 Mar 2016 08:33:56 +1300; Embarrassingly, they are on my doorstep as I typed that email. Oh well. S _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/lis; /archives//html/Amps/2016-03/msg00044.html (7,128 bytes)
51. Re: [Amps] LDMOS amps (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Thu, 11 Aug 2016 07:07:39 +1200; google search.. There are countless LDMOS amps being built. N9IWW _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/am; /archives//html/Amps/2016-08/msg00002.html (6,908 bytes)
52. Re: [Amps] SCR to adjust 240v to 200v (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Tue, 16 Aug 2016 07:43:10 +1200; If you can drop the filament voltage by winding an opposing turn somewhere, or maybe a large resistor - the rest of it can probably be ignored. Test the 200V transformer running at 230V, by removing; /archives//html/Amps/2016-08/msg00028.html (10,038 bytes)
53. Re: [Amps] Ldmos heat spreaders (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Tue, 16 Aug 2016 07:57:10 +1200; I've only found up to 6mm think would this be okay ? Or could I get away with 2 layers to get 12 mm with heat transfer paste ? I've bought 12mm copper bar from Steeltech on Te Tahi street. Heat trans; /archives//html/Amps/2016-08/msg00030.html (8,465 bytes)
54. Re: [Amps] Buzzing transformer (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Tue, 27 Sep 2016 11:03:21 +1300; If the transformer has a shorted winding, I expect it would go up in smoke in short order! Any transformer can have a winding replaced - they were actually assembled that way. S ____________________; /archives//html/Amps/2016-09/msg00125.html (7,788 bytes)
55. [Amps] illegal amps (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Wed, 28 Sep 2016 10:17:09 +1300; Well, they're everywhere now aren't they. No one going to prison? No amps confiscated by customs? Any horror stories with a govt agency? An operator near me has run 6KW into a foursquare for 25 years; /archives//html/Amps/2016-09/msg00133.html (7,270 bytes)
56. Re: [Amps] Buzzing transformer (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Fri, 30 Sep 2016 08:56:58 +1300; I agree that any transformer can have a winding replaced, but would it be cost effective, particularly with a small transformer? It would probably be cheaper to buy a new unit. Just have a go at it.; /archives//html/Amps/2016-09/msg00139.html (7,767 bytes)
57. Re: [Amps] Buzzing transformer (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Fri, 30 Sep 2016 10:58:58 +1300; Often it is about how the transformer is designed ; A low flux density (more overall windings on the core) will give a quiet transformer at idle with low standing loss, but worse regulation at full l; /archives//html/Amps/2016-10/msg00003.html (9,263 bytes)
58. Re: [Amps] Negative current with a zener screen grid regulator (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Wed, 19 Oct 2016 06:18:22 +1300; My understanding is, part way through a tetrodes' life it's screen current requirements will reverse. I think you could just swamp it with more current through the zener string, or else build an acti; /archives//html/Amps/2016-10/msg00090.html (8,189 bytes)
59. Re: [Amps] Ampleon BLF189XR 1900W LDMOS transistor (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Wed, 19 Oct 2016 06:23:08 +1300; On 19/10/16 05:00, "Joe Subich, W4TV" <lists@subich.com> wrote: [...] some unscrupulous manufacturer will certainly build a product around the BLF189XR and probably advertise it as a 2KW PEP amplifie; /archives//html/Amps/2016-10/msg00091.html (7,686 bytes)
60. Re: [Amps] TL-922(A) Recent Acquisition (score: 1): Author: Steve Wright <stevewrightnz@gmail.com>; Date: Tue, 25 Oct 2016 23:25:27 +1300; On 25/10/16 15:28, Jeff Breitner <lists@rudn.com> wrote: I'd like to get some opinions/thoughts on bringing back into operation a TL-922a that I recently acquired. The unit sat for at least 15 years; /archives//html/Amps/2016-10/msg00114.html (8,534 bytes)

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