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Total 1085 documents matching your query.

41. [Amps] High Power class E transmitters - anyone interested? (score: 1)
Author: wlfuqu00@uky.edu (wl fuqua)
Date: Thu, 21 Nov 2002 17:39:15 -0500
Class E is so non-linear that you have to use a modulator for CW to prevent key clicks. Since it is practical on HF bands the only mode that may be used would be FSK or PSK. PSK31 would not be a good
/archives//html/Amps/2002-11/msg00331.html (8,198 bytes)

42. [Amps] DC On tube filaments (score: 1)
Author: wlfuqu00@uky.edu (wl fuqua)
Date: Wed, 09 Oct 2002 15:11:24 -0400
The only problem that I can see (and this effect should be small) is that the more negative end of the filament of a directly heated cathode would emit less current than the positive. In some cases l
/archives//html/Amps/2002-10/msg00082.html (10,411 bytes)

43. [Amps] F.S. 6" long 1" dia. ceramic insulators (score: 1)
Author: wlfuqu00@uky.edu (wl fuqua)
Date: Fri, 11 Oct 2002 11:24:54 -0400
I have some 6" long and 1 " diameter Ceramic insulators that I will sell in multiples of 5 for $30 ( about $5 each and postage) which includes shipping to lower 48 States USPS snail mail. Please, No
/archives//html/Amps/2002-10/msg00103.html (7,599 bytes)

44. [Amps] FS rectifier stacks High voltage and current (score: 1)
Author: wlfuqu00@uky.edu (wl fuqua)
Date: Fri, 11 Oct 2002 14:16:13 -0400
Besides the insulators I have some high voltage rectifier stacks RCA Part I will sell these for $25 a pair (good for 5KV @ several amps voltage doubler). These can be found in the RCA transmitting tu
/archives//html/Amps/2002-10/msg00107.html (6,965 bytes)

45. [Amps] F.S. 6" long 1" dia. ceramic insulators (score: 1)
Author: wlfuqu00@uky.edu (wl fuqua)
Date: Fri, 11 Oct 2002 22:13:34 -0400
These ceramic insulators are tapped 1/4-20 one each end. I have some 6" long and 1 " diameter Ceramic insulators that I will sell in multiples of 5 for $30 ( about $5 each and postage) which includes
/archives//html/Amps/2002-10/msg00115.html (7,625 bytes)

46. [Amps] DC On tube filaments (score: 1)
Author: wlfuqu00@uky.edu (wl fuqua)
Date: Mon, 14 Oct 2002 08:56:34 -0400
Filaments generally loose emission long before they thin out and burn out. Also, in comparison to light bulbs they run a good deal cooler. Semiconductors, to function, require a crystal lattice struc
/archives//html/Amps/2002-10/msg00129.html (8,943 bytes)

47. [Amps] DC On tube filaments (score: 1)
Author: wlfuqu00@uky.edu (wl fuqua)
Date: Mon, 14 Oct 2002 09:09:25 -0400
i get .75mm is .44 square mm. and there are a million square microns in a square mm( 1000 squared). So the cross sectional area would be 440,000 square microns. And with 14 amps I get 3.16e-5 amps pe
/archives//html/Amps/2002-10/msg00130.html (9,780 bytes)

48. Fwd: [Amps] F.S. 6" long 1" dia. ceramic insulators (score: 1)
Author: wlfuqu00@uky.edu (wl fuqua)
Date: Mon, 14 Oct 2002 10:19:53 -0400
I still have insulators and rectifiers left. If any of you that ordered a set wish to double the order please do so. Get your lifetime supply now. If you want a picture I can send one. 73 Bill wa4lav
/archives//html/Amps/2002-10/msg00131.html (9,934 bytes)

49. [Amps] Correction:: FS rectifier stacks High voltage and current (score: 1)
Author: wlfuqu00@uky.edu (wl fuqua)
Date: Tue, 15 Oct 2002 11:10:37 -0400
I mistyped the part number. I just now looked it up again. These are really RCA CR305's for single phase. These are a foot long and 2.25 inches wide and 2" tall 7200 PIV at 5 amps. They may be found
/archives//html/Amps/2002-10/msg00140.html (7,673 bytes)

50. [Amps] How light can you make a 500W amplifier? (score: 1)
Author: wlfuqu00@uky.edu (wl fuqua)
Date: Tue, 15 Oct 2002 14:50:18 -0400
Is this daffy???? 73 Bill wa4lav
/archives//html/Amps/2002-10/msg00148.html (10,617 bytes)

51. [Amps] FS ^' x 1" dia. insulators and HV rectifiers (score: 1)
Author: wlfuqu00@uky.edu (Bill L. Fuqua)
Date: Wed, 16 Oct 2002 10:40:20 -0400
To all those that have put in orders for the insulators and rectifiers. I a going on a short business trip today. I will be back on Monday and will then pack and ship your items. Sorry for the delay
/archives//html/Amps/2002-10/msg00171.html (6,476 bytes)

52. [Amps] proper label (score: 1)
Author: wlfuqu00@uky.edu (Bill L. Fuqua)
Date: Thu, 24 Oct 2002 22:32:26 -0400
Well, common grid or grounded grid(s) would still apply. Both grids in a tetrode tube would modulate the electron current. The advantage comes from the inherent negative feedback in this mode which i
/archives//html/Amps/2002-10/msg00255.html (8,075 bytes)

53. [Amps] Why do people post to individuals and AMPS ? (score: 1)
Author: wlfuqu00@uky.edu (wl fuqua)
Date: Fri, 25 Oct 2002 09:34:41 -0400
There are two reasons, 1. The buttons available on most email programs are: Reply to sender Reply to all forward. 2. Many filter incoming mail to read at later time. So if you have reply to someone's
/archives//html/Amps/2002-10/msg00265.html (8,382 bytes)

54. [Amps] Computer Grade Electrolytic Capacitors vs. Radial (score: 1)
Author: wlfuqu00@uky.edu (Bill L. Fuqua)
Date: Wed, 04 Sep 2002 23:46:06 -0400
For an inductive input filter the RMS ripple current is equal to the output current if you have a single phase supply. For a capacitive input filter the max ripple current will be equal to the square
/archives//html/Amps/2002-09/msg00033.html (8,728 bytes)

55. [Amps] Computer Grade Electrolytic Capacitors vs. Radial (score: 1)
Author: wlfuqu00@uky.edu (William Fuqua)
Date: Thu, 05 Sep 2002 11:14:36 -0400
The 1.414 factor is the maximum assuming zero source resistance. It will be less with series resistance. 73 Bill wa4lav
/archives//html/Amps/2002-09/msg00038.html (10,188 bytes)

56. Fwd: Re: [Amps] Computer Grade Electrolytic Capacitors vs.Radial (score: 1)
Author: wlfuqu00@uky.edu (William Fuqua)
Date: Fri, 06 Sep 2002 16:21:24 -0400
To: <amps@contesting.com> To: <amps@contesting.com>
/archives//html/Amps/2002-09/msg00047.html (11,238 bytes)

57. [Amps] A general question about why anodes get hot (score: 1)
Author: wlfuqu00@uky.edu (wl fuqua)
Date: Wed, 18 Sep 2002 10:14:11 -0400
Basically each electron is accelerated thru an electrical potential (voltage) and gains kinetic energy. This energy goes some place when the electron strikes the anode of the tube. Well, it goes into
/archives//html/Amps/2002-09/msg00125.html (9,356 bytes)

58. [Amps] Gonset Amplifier (score: 1)
Author: wlfuqu00@uky.edu (wl fuqua)
Date: Wed, 18 Sep 2002 17:17:29 -0400
P&H's amplifier used modified 1625's. Suppressor ( or beam forming plates) grid brought out separately from the cathode to reduce input to output capacitance in GG operation. This required either rem
/archives//html/Amps/2002-09/msg00138.html (10,729 bytes)

59. [Amps] Gonset Amplifier (score: 1)
Author: wlfuqu00@uky.edu (Bill L. Fuqua)
Date: Wed, 18 Sep 2002 21:28:41 -0400
indeed no 807's had separate leads to the cathode and supressor grid. I had played with both 1625s and 837s in my younger years. I put the 1625s in an oven to melt the glue holding the base and then
/archives//html/Amps/2002-09/msg00146.html (14,004 bytes)

60. [Amps] RF screen current (score: 1)
Author: wlfuqu00@uky.edu (wl fuqua)
Date: Tue, 24 Sep 2002 14:20:50 -0400
The heating of the grid due to RF is the rf resistance of the grid (taking into account skin effect) times the current squared. While what we usually consider screen dissipation is the DC screen volt
/archives//html/Amps/2002-09/msg00230.html (10,879 bytes)


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