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Total 1085 documents matching your query.

201. Re: [Amps] re: baking out tubes (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Tue, 26 Oct 2004 10:26:30 -0400
At 03:41 AM 10/26/2004 -0700, R.Measures wrote: Thus, when a higher-mileage grid becomes warm from the flow of normal grid current, the barium coating on it begins emitting electrons in the Wrong sti
/archives//html/Amps/2004-10/msg00424.html (9,482 bytes)

202. Re: [Amps] A Meeting Ground (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Thu, 04 Nov 2004 13:04:16 -0500
This has always been an issue. Particularly when high-Q circuits are involved. One time while helping the accelerator tech try to find out why our 20 MHz, 10KW bunching amplifier signal was getting i
/archives//html/Amps/2004-11/msg00076.html (9,639 bytes)

203. Re: [Amps] Ten-Tec Centurion (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Thu, 11 Nov 2004 09:13:46 -0500
I just took a look at some of the emails on this subject. Saying that please pardon any repetition of anything previously mentioned. When the amplifier is in idle state what impedances does it see on
/archives//html/Amps/2004-11/msg00145.html (11,801 bytes)

204. Re: [Amps] Ten-Tec Centurion (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Thu, 11 Nov 2004 10:24:35 -0500
At 07:06 AM 11/11/2004 -0800, R. Measures wrote: On Nov 11, 2004, at 6:13 AM, Bill Fuqua wrote: When the amplifier is in idle state what impedances does it see on the input and output. Unloaded ampli
/archives//html/Amps/2004-11/msg00152.html (11,636 bytes)

205. Re: [Amps] Here's a Shocker (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Mon, 15 Nov 2004 14:51:32 -0500
Maybe when the FCC allows higher conductive signals for BPL they can eliminate the annoying 60Hz power line current and we can power everything in our homes by rectifying the RF. 73 Bill wa4lav At 02
/archives//html/Amps/2004-11/msg00222.html (11,353 bytes)

206. Re: [Amps] Advice on instruments for ham use (score: 1)
Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>
Date: Wed, 24 Nov 2004 22:52:12 -0500
I have not read all the emails about this subject but I do have some experience to relate to the list. 1. 455 and 465 scopes are fine except when the attenuator switches wear out. They consist of cam
/archives//html/Amps/2004-11/msg00421.html (9,887 bytes)

207. Re: Re: [Amps] Advice on instruments for ham use (score: 1)
Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>
Date: Thu, 25 Nov 2004 17:42:39 -0500
Tektronix used to make the very best analog scopes. It is ashame that they dont make one now. I recall looking at demos before purchasing a large number of scopes. And the Tek scopes always were best
/archives//html/Amps/2004-11/msg00432.html (10,456 bytes)

208. Re: Re: [Amps] Advice on instruments for ham use (score: 1)
Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>
Date: Fri, 26 Nov 2004 14:43:12 -0500
The 455 (50 MHz) or 465 (100Mhz) are great scopes if they are good condition. They are often available for around $100 or so. If you have a problem with the attenuator switches perhaps the fix that w
/archives//html/Amps/2004-11/msg00439.html (11,319 bytes)

209. [Amps] mounting 3CX3000A7 Horizontally (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Tue, 30 Nov 2004 16:36:45 -0500
Just bought a plasma generator at a surplus sale ($25) which was made by International Plasma Corporation. It appears to have a 3CX3000A7 mounted horizontally. I had always assumed this is a no-no bu
/archives//html/Amps/2004-11/msg00464.html (7,609 bytes)

210. RE: [Amps] mounting 3CX3000A7 Horizontally (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Wed, 01 Dec 2004 12:12:13 -0500
OOPS,,,, I should have waited until I got into some bright light and opened the Plasma generator up. I was looking thru a grill in the back of this thing in a dark warehouse at the time. The tube app
/archives//html/Amps/2004-12/msg00007.html (7,697 bytes)

211. Re: [Amps] Dx pedition amp ??? (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Thu, 02 Dec 2004 09:15:34 -0500
There used to be. A guy was selling amps with a pair of 4CX250Bs and separate power supply some years ago at Dayton but I have not seen him lately. He used to have a web site but I can't recall what
/archives//html/Amps/2004-12/msg00027.html (9,861 bytes)

212. Re: Re: [Amps] antennas that are 1:1 vswr all over the band (score: 1)
Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>
Date: Thu, 23 Dec 2004 07:35:56 -0500
Beverage antenna is a directional receive only antenna. It is very ineffecient but at lower frequencies where atmospheric noise is so high it does not matter. 73 Bill wa4lav --Original Message-- From
/archives//html/Amps/2004-12/msg00282.html (9,630 bytes)

213. Re: [Amps] Ref: 4- 6AG7 Linear (score: 1)
Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>
Date: Sat, 25 Dec 2004 11:10:43 -0500
I ran (4) 6AG7 tubes with about 1100 or 1200 volts on the plate. They were in grounded grid and were pressed into a heatsink I made of a block of aluminim. I had drilled 1"holes in it and using a tab
/archives//html/Amps/2004-12/msg00314.html (8,686 bytes)

214. Re: [Amps] tuned input pr 4-1000,s (score: 1)
Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>
Date: Fri, 31 Dec 2004 22:11:17 -0500
I gather this is a pair of 4-1000A tubes. If so in GG it should have about 50 ohms input resistance. The only thing you have to do is to add a parallel LC with the reactances of less than 3 ohms or s
/archives//html/Amps/2004-12/msg00420.html (7,519 bytes)

215. Re: [Amps] For any technicians (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Thu, 13 Jan 2005 12:22:21 -0500
does the crystal have a capacitor associated with it for adjusting it's frequency? If so the frequency may be determined by the parallel resonant mode of the crystal and determined by the loading cap
/archives//html/Amps/2005-01/msg00250.html (9,270 bytes)

216. Re: [Amps] qrp-excited amps (score: 1)
Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>
Date: Fri, 14 Jan 2005 19:16:20 -0500
I have a 2KW plasma generator that operates on 13.56MHz that has a small circuit board with only one 5763 tube oscillator driving a neutralized 5cx1500. Why not replace it with a qrp tranceiver. 73 B
/archives//html/Amps/2005-01/msg00265.html (7,890 bytes)

217. Re: [Amps] 4CX250 Grounded Grid (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Tue, 18 Jan 2005 09:22:14 -0500
If you have lots of drive you can connect the control grid to the cathode and ground screen grid. But the cathode would have to swing 200 to 350 volts negative to get reasonable output power. This pe
/archives//html/Amps/2005-01/msg00342.html (8,140 bytes)

218. Re: [Amps] Tetrodes in GG Configuration (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Thu, 20 Jan 2005 11:24:27 -0500
Why not put in a 50 or 100 ohm RF cathode resistor(bypassed by RF choke) then you would have more negative feedback than grounded grid triode. You may waste 50 or 100 watts in the resistor. But would
/archives//html/Amps/2005-01/msg00401.html (11,688 bytes)

219. Re: [Amps] Want to build first amp (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Thu, 20 Jan 2005 11:32:27 -0500
When building my fist transmitters and amplifiers, I built them as single band units. This allowed me to get something working quickly and debug problems before I added even more parts. And to learn
/archives//html/Amps/2005-01/msg00402.html (10,245 bytes)

220. Re: [Amps] High C out (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Fri, 21 Jan 2005 14:40:47 -0500
For an L you need the capacitance on the high-z side. The capacitance should be from plate to ground and the L in series with the 50 ohm load. Q is the square root of the impedance ratio. You need ad
/archives//html/Amps/2005-01/msg00427.html (9,924 bytes)

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