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181. Re: [Amps] 4-400A and QB4-1100 amp - TSPA (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Wed, 01 Sep 2004 11:59:18 -0400
That gives me an idea. I have a Thunderbolt and if I go to solid state rectifiers, a capacitive input filter and then wire up the 866A's in parallel but in series with the filtered output I would sti
/archives//html/Amps/2004-09/msg00011.html (10,032 bytes)

182. Re: [Amps] 4-400A and QB4-1100 amp - TSPA (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Wed, 01 Sep 2004 15:26:21 -0400
The Thuderbolt was really designed for the old CW operators running class C. Few had SSB when it came out. And under those conditions it did run the legal limit of 1KW plate input. I got one because
/archives//html/Amps/2004-09/msg00018.html (9,027 bytes)

183. Re: [Amps] How do I determine Class (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Wed, 01 Sep 2004 17:19:19 -0400
At 09:59 AM 9/1/2004 -0700, R.Measures wrote: On Sep 1, 2004, at 8:22 AM, Jim Isbell wrote: This is EXACTLY the answer I needed. The amp uses a pair of 4-125As and the screens are at "350V - 400V" Pl
/archives//html/Amps/2004-09/msg00024.html (10,348 bytes)

184. Re: [Amps] Homeland Security (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Wed, 01 Sep 2004 17:40:21 -0400
Gee, I don't want that camel's nose in my tent! The best thing about ham radio is the lack of need for infrastructure and that the hams have always purchased or built their own equipment thus not bei
/archives//html/Amps/2004-09/msg00025.html (10,097 bytes)

185. Re: [Amps] Homeland Security (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Thu, 02 Sep 2004 09:37:32 -0400
The concept of Amateur radio is wonderful. Imagine, here is a bunch of people that are willing to spend thousands of dollars of their own money, volunteer to provide training and testing, are availab
/archives//html/Amps/2004-09/msg00040.html (13,286 bytes)

186. Re: [Amps] How do I determine Class (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Thu, 02 Sep 2004 09:43:22 -0400
I think it has to do with the close proximity and precise alignment of the screen grids with the control grids so that screen grids are in the electron shadow of the control grids. I have not given i
/archives//html/Amps/2004-09/msg00041.html (12,769 bytes)

187. Re: [Amps] How do I determine Class (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Thu, 02 Sep 2004 13:37:21 -0400
At 12:07 PM 9/2/2004 -0400, Will Matney wrote: Bill, I was reading about this a while back. If I recall, the spacing between the screen grid and the anode in power tetrodes help control secondary emi
/archives//html/Amps/2004-09/msg00053.html (11,881 bytes)

188. Re: [Amps] Recommend supplier for aluminum sheet? (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Mon, 13 Sep 2004 09:27:50 -0400
That reminds me. There is a guy every year at the Dayton Hamvention that sells aluminum boxes that he makes himself. Naturally I have no idea who he is or where his outside flea market spot was. He c
/archives//html/Amps/2004-09/msg00243.html (8,570 bytes)

189. [Amps] Need power supply info. (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Mon, 20 Sep 2004 15:40:51 -0400
I picked up (cheap) a couple of power supplies used in a some motorola repeater which uses conduction cooled tubes in the final. Just got the power supplies. These seem to have ferro-resonant regulat
/archives//html/Amps/2004-09/msg00365.html (6,590 bytes)

190. Re: [Amps] Non-inductive resistors (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Tue, 28 Sep 2004 15:52:33 -0400
There would be too little magnetic coupling from two series resistors wound opposite directions for the field to cancel. Some N.I. wire wound resistors have two opposite direction wound coils such th
/archives//html/Amps/2004-09/msg00474.html (10,311 bytes)

191. Re: Re: [Amps] Need for input tuning circuit (score: 1)
Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>
Date: Fri, 08 Oct 2004 21:03:30 -0400
But, if you are only operating CW or FSK it is not needed. Due to the fact that intermodulation distortion is not an issue. You can operate class C. The only need for some ( very little) linearity on
/archives//html/Amps/2004-10/msg00103.html (9,593 bytes)

192. Re: Re: [Amps] Need for input tuning circuit (score: 1)
Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>
Date: Sat, 09 Oct 2004 20:58:43 -0400
There is grid current. That is how negative bias is generated when using a "grid leak resistor". It is bias by grid rectification. Two types of clamp circuits were used. One use the DC bias generated
/archives//html/Amps/2004-10/msg00122.html (9,394 bytes)

193. Re: Re: [Amps] Need for input tuning circuit (score: 1)
Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>
Date: Sat, 09 Oct 2004 21:03:26 -0400
That works. I had a 6L6 as clamp tube in my pair of 6146B ampifier since I was using plate modulation. But did not use in for larger amplifiers. 73 Bill wa4lav There needs to be a capacitor across th
/archives//html/Amps/2004-10/msg00123.html (8,766 bytes)

194. Re: [Amps] Plate modulator xmfr ? (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Mon, 11 Oct 2004 09:44:06 -0400
What formulas would you use? By the way, one reason to modulate the screen grid along with the plate is to make the tetrode tubes' plate impedance appear to be more like a triode than a tetrode. The
/archives//html/Amps/2004-10/msg00143.html (10,049 bytes)

195. Re: [Amps] Transformers in parallel (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Mon, 11 Oct 2004 18:16:57 -0400
I have a Henry 5KW plasma generator that has 2 paralleled single phase HV transformers in it. The only difference between this and the 3KW is one transformer. 73 Bill wa4lav At 04:15 PM 10/11/2004 -0
/archives//html/Amps/2004-10/msg00165.html (7,897 bytes)

196. Re: [Amps] Looking for a design for a single 4cx250b tube on50 Mhz-six meters. (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Tue, 12 Oct 2004 14:51:52 -0400
The manual claims that a single 4CX250B will produce 600 watts peak output. It has unregulated bias supplies as well. I wonder if that is figuring peak voltage squared divided by resistance rather th
/archives//html/Amps/2004-10/msg00181.html (8,927 bytes)

197. Re: [Amps] Looking for a design for a single 4cx250b tubeon 50 Mhz-six meters. (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Tue, 12 Oct 2004 17:10:59 -0400
Wide open, does that mean class C SSB? 73 Bill wa4lav At 03:10 PM 10/12/2004 -0400, craxd wrote: Bill, That amp, which really said was an amateur amp, was mostly sold to the 11 meter folks. The large
/archives//html/Amps/2004-10/msg00188.html (11,530 bytes)

198. Re: [Amps] Drake L4/L4-B tube replacement - 3-400Z or 3-500Zor 3-500ZG (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Wed, 20 Oct 2004 08:55:02 -0400
Besides the 3-400Zs glow brighter. Must add a window to appreciate! 73 Bill wa4lav At 01:12 PM 10/20/2004 +0200, DF3KV wrote: -- Original Message -- From: "Jason Buchanan" <jsb@digistar.com> To: <amp
/archives//html/Amps/2004-10/msg00291.html (9,366 bytes)

199. Re: [Amps] a question on non-linearity (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Thu, 21 Oct 2004 16:38:40 -0400
I thought I was on to something but checked and was off one digit. A 7C24 is a 5762 which is a triode with 2.5 KW plate dissipation. Very common in older AM transmitters. Don't know about a 7C23. 73
/archives//html/Amps/2004-10/msg00369.html (7,962 bytes)

200. Re: [Amps] re: baking out tubes (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Sun, 24 Oct 2004 14:54:18 -0400
If the tube has no getter baking out requires a high vacuum system. The gas has to go somewhere after being driven off the internal surfaces of the tube. There is another process called conditioning
/archives//html/Amps/2004-10/msg00392.html (7,921 bytes)


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