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Total 614 documents matching your query.

161. Re: [Amps] "Tubes 201" - How Vacuum Tubes Really Work (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Tue, 25 Jul 2006 06:15:03 -0400
Hi Will, No, I'm not saying Terman is lying or that Terman spews hogwash. 73 Tom _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mai
/archives//html/Amps/2006-07/msg01071.html (10,968 bytes)

162. Re: [Amps] Fw: "Tubes 201" - How Vacuum Tubes Really Work (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Tue, 25 Jul 2006 08:39:21 -0400
Hello John, apart from the real fact (which I'm trying to follow), what Will states don't seem to me a contradiction. From what he wrote, what I understand is that to become positive is that the grid
/archives//html/Amps/2006-07/msg01078.html (9,161 bytes)

163. Re: [Amps] Fw: "Tubes 201" - How Vacuum Tubes Really Work (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Tue, 25 Jul 2006 10:39:43 -0400
Make sure it is one line John! http://www.w8ji.com/images/Amplifier/Bias%20and%20grid%20fuse/Electronic-Designers-Handbo.jpg _______________________________________________ Amps mailing list Amps@co
/archives//html/Amps/2006-07/msg01083.html (8,139 bytes)

164. Re: [Amps] "Tubes 201" - How Vacuum Tubes Really Work (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Tue, 25 Jul 2006 11:18:18 -0400
Because being over-driven is caused by being underloaded. Excessive grid current in a GG amp is caused by too much drive power for the plate load impedance. A low load impedance allows more drive. 7
/archives//html/Amps/2006-07/msg01084.html (10,400 bytes)

165. Re: [Amps] Fw: "Tubes 201" - How Vacuum Tubes Really Work (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Tue, 25 Jul 2006 11:21:25 -0400
That's correct. POSITIVE with respect to cathode. I have at least a half-dozen books that say exactly that, including Terman. They clearly say POSITIVE grid voltage with respect to cathode. 73 Tom _
/archives//html/Amps/2006-07/msg01085.html (8,476 bytes)

166. Re: [Amps] setting the grid adrift (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Tue, 25 Jul 2006 12:26:21 -0400
Correct. In smaller low voltage tubes that are gas free, it will go negative. That's how contact bias works. In larger tubes, especially HV tubes, there is always some residual gas and positive ions
/archives//html/Amps/2006-07/msg01090.html (12,374 bytes)

167. Re: [Amps] setting the grid adrift (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Tue, 25 Jul 2006 14:44:54 -0400
As long as it works the same. It is a recommended design standard that appears many places. Not a philosophy. Anyone who has taken basic physics or worked with electronics in any technical depth sho
/archives//html/Amps/2006-07/msg01106.html (11,715 bytes)

168. Re: [Amps] setting the grid adrift (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Tue, 25 Jul 2006 15:48:28 -0400
Will, Early on you said contact bias and grid leak bias were the same, they are not. You also said when the grid was floated during a fuse or resistor blow, it would go negative. It does not in the
/archives//html/Amps/2006-07/msg01114.html (12,715 bytes)

169. Re: [Amps] setting the grid adrift (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Tue, 25 Jul 2006 21:26:07 -0400
First, how do you know 1000 people did that mod? Second, millions of things are sold every year that do absolutely nothing. Look at the New Age things. Third, it can easily be demonstrated in contro
/archives//html/Amps/2006-07/msg01134.html (10,876 bytes)

170. [Amps] PIN diode mods (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Tue, 25 Jul 2006 21:33:56 -0400
You know Peter, that is a good example of voodoo pathological science. I spent quite a bit of time investigating PIN diodes vs. regular diodes in my rigs and found absolutely no difference at all. Y
/archives//html/Amps/2006-07/msg01135.html (8,968 bytes)

171. Re: [Amps] MOSFET biasing (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Tue, 25 Jul 2006 21:44:06 -0400
Am I correct in assuming that I would be better of with a circuit that would allow me to set the bias on each individual transistor or should the bias voltage be the same for each push-pull pair? Dan
/archives//html/Amps/2006-07/msg01136.html (7,141 bytes)

172. Re: [Amps] setting the grid adrift (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Wed, 26 Jul 2006 06:14:36 -0400
Will, I'm trying to get some idea what your experience is Will, since it certainly disarees with what I have seen and other people on this reflector with design experience has seen. I'm trying to ge
/archives//html/Amps/2006-07/msg01148.html (10,750 bytes)

173. Re: [Amps] PIN diode mods (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Wed, 26 Jul 2006 06:52:05 -0400
My FT10000's sure didn't change a bit in any measured parameter, and I used the slowest diodes I had. Neither did my IC 751A. I did two tone IMD and blocking DR tests both in an out of the roofing f
/archives//html/Amps/2006-07/msg01151.html (7,622 bytes)

174. Re: [Amps] setting the grid adrift (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Wed, 26 Jul 2006 07:10:15 -0400
Chris, In the manufacturing process, great effort is made to understand why and how things fail and what to do to prevent failure. When you have several thousands of something in the field you don't
/archives//html/Amps/2006-07/msg01154.html (10,341 bytes)

175. Re: [Amps] flash arcs (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Wed, 26 Jul 2006 07:12:34 -0400
That's exactly the type of damage I have seen. As I posted earlier, 3-500z's generally mark the grid support cone at the bottom with very fine lines. 73 Tom _________________________________________
/archives//html/Amps/2006-07/msg01155.html (7,383 bytes)

176. Re: [Amps] plexiglas isolation in coils (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Wed, 26 Jul 2006 17:05:15 -0400
Dick, There is no way possible to answer your question because it depends on the dielectric stress in the material. It would depend on electric field strength and how it is distributed even more tha
/archives//html/Amps/2006-07/msg01190.html (8,027 bytes)

177. Re: [Amps] plexiglas isolation in coils (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Wed, 26 Jul 2006 18:21:59 -0400
What I'm saying is life or suitability of materials or loss in a particular application depends on much more than just heating of the material on 2GHz. This was covered in detail in the ceramic capa
/archives//html/Amps/2006-07/msg01196.html (7,596 bytes)

178. [Amps] Apology to Will and the list (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Wed, 26 Jul 2006 21:24:47 -0400
Will and the list, I certainly am sorry if my questions were taken to be personal Will. It was a little tough for me to tell where you were coming from. People have different perspectives depending o
/archives//html/Amps/2006-07/msg01203.html (7,324 bytes)

179. Re: [Amps] flash arcs (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Wed, 26 Jul 2006 23:12:59 -0400
Jim, That post didn't come from me! I don't know a thing about Gossling's paper. So Tom W8JI didn't write it, someone else must have. 73 Tom _______________________________________________ Amps mail
/archives//html/Amps/2006-07/msg01207.html (7,397 bytes)

180. Re: [Amps] arc to grid basket TSPA (score: 1)
Author: "Tom W8JI" <w8ji@w8ji.com>
Date: Thu, 27 Jul 2006 13:40:06 -0400
I thought most people knew that John, but perhaps it was good to mention it. Sharp points are a big problem. It's all a matter of voltage gradient or charge distribution. The shape can be more impor
/archives//html/Amps/2006-07/msg01221.html (7,536 bytes)

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