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301. Re: [Amps] Tuned Input (score: 1)
Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>
Date: Sun, 22 Jan 2006 16:08:33 -0500
Don't forge coax is has both inductance and capacitance. In fact the characteristic impedance is the squareroot of L/C. L and C are inductance per a unit of length. 73 Bill wa4lav True, K. A.,. howev
/archives//html/Amps/2006-01/msg00508.html (19,873 bytes)

302. Re: [Amps] Pi vs Pi-L (score: 1)
Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>
Date: Wed, 01 Feb 2006 23:38:49 -0500
--Original Message-- The ubiquitous t-network tuner with series capacitors and a shunt inductor (like the MFJs) is a high-pass filter, so it won't help a bit. -- Not quite right. As a counter example
/archives//html/Amps/2006-02/msg00018.html (9,447 bytes)

303. Re: [Amps] T networks and harmonics (score: 1)
Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>
Date: Mon, 06 Feb 2006 07:25:14 -0500
If the impedances are quite different there will be attenuation. You have the same input and output impedances. I was referring to a T network as an output impedance network which has to match very d
/archives//html/Amps/2006-02/msg00125.html (9,320 bytes)

304. Re: [Amps] 60 filament noise (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Mon, 06 Feb 2006 16:41:45 -0500
In non-linear amplifiers the 60 Hz modulation by the filament is basically cathode modulation. If the voltage applied to a directly heated cathode is not balanced on either side of the filament the e
/archives//html/Amps/2006-02/msg00140.html (11,097 bytes)

305. Re: [Amps] Glass envelope (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Wed, 08 Feb 2006 10:49:24 -0500
The gas would be air until some surfaces oxidize during the pumping/baking process. The nice thing about carbon coated elements (particularly the filament) is that reaction oxygen produces either CO
/archives//html/Amps/2006-02/msg00190.html (13,318 bytes)

306. Re: [Amps] Here's something you don't see every day (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Tue, 14 Feb 2006 12:26:12 -0500
He may just be advertising his amplifier building service. Note another amplifier in the background that may be under construction. Yahoo's rules are much not as strict than E-bay's. 73 Bill wa4lav _
/archives//html/Amps/2006-02/msg00256.html (8,421 bytes)

307. Re: [Amps] Here's something you don't see every day (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Tue, 14 Feb 2006 12:29:11 -0500
I need to finish editing before hitting the send button. He may just be advertising his amplifier building service. Note another amplifier in the background that may be under construction. Yahoo's ru
/archives//html/Amps/2006-02/msg00257.html (8,220 bytes)

308. Re: [Amps] Automatic bandswitching (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Wed, 15 Feb 2006 12:38:24 -0500
Anyone remember the National MB-150 all band (except 160 and maybe WARC) network? Wonder if there is something like it for 2kW or so that matched 50ohms. 73 Bill wa4lav ______________________________
/archives//html/Amps/2006-02/msg00269.html (7,632 bytes)

309. [Amps] AM-495 (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Mon, 20 Feb 2006 09:59:51 -0500
I am looking for an AM-495 or the commercial version of it. I had one many years ago that I modified to run on 20 and 15 meters with my 20A SSB exciter. I don't need the power supply or the tubes. If
/archives//html/Amps/2006-02/msg00359.html (7,105 bytes)

310. Re: [Amps] AM-495 (score: 1)
Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>
Date: Mon, 20 Feb 2006 21:36:14 -0500
Yes, It had push pull 4x150A final. I replaced them with 4CX250B and used the full inductance of the plate coil and paralleled the capacitors that were previously in series. Since the capacitance was
/archives//html/Amps/2006-02/msg00371.html (8,846 bytes)

311. Re: [Amps] LeCroy scopes (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Mon, 27 Feb 2006 11:37:01 -0500
LeCroy is a manufacturer of electronic scientific instruments. Their instruments are designed to meet the needs of researchers and not those repairing or aligning equipment. An example a LeCroy digit
/archives//html/Amps/2006-02/msg00616.html (8,968 bytes)

312. Re: [Amps] LeCroy scopes (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Mon, 27 Feb 2006 12:49:38 -0500
Good point, Once I got past the deficiencies of the input amplifiers I should have mentioned the probes because many thing that the x10 probes will protect their equipment when often they will not. T
/archives//html/Amps/2006-02/msg00619.html (11,507 bytes)

313. Re: [Amps] LeCroy scopes (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Mon, 27 Feb 2006 14:15:52 -0500
That is the unfortunate thing about Tektronix. Their analog scopes were unbeatable. Now they only make digital scopes. Many times I find digital sampling scopes annoying. I kind of liked the ones wit
/archives//html/Amps/2006-02/msg00631.html (9,650 bytes)

314. Re: [Amps] HB amps (score: 1)
Author: "Bill L. Fuqua" <wlfuqu00@uky.edu>
Date: Fri, 03 Mar 2006 17:39:20 -0500
I don't think plate dissipation is the what limits the 813, but emission. A pair of carbon plate 813's have much more surface area than a single 3-500. It takes a lot to make them glow. Their plate d
/archives//html/Amps/2006-03/msg00049.html (10,334 bytes)

315. [Amps] Panasonic "inverter" Switching HV power supply (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Thu, 09 Mar 2006 10:42:20 -0500
I have not had the time to get back to experimenting with the Panasonic Inverter Microwave oven HV supply. Have any of you had a chance to actually use one? I did some experiments and was able to con
/archives//html/Amps/2006-03/msg00228.html (6,621 bytes)

316. Re: [Amps] Microwave Oven Autopsy (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Mon, 13 Mar 2006 09:00:25 -0500
Using a pair of transformers in a full-wave center-tapped configurations is really making two parallel half wave supplies. The problem is that the flux in the core can not reverse direction thus limi
/archives//html/Amps/2006-03/msg00324.html (9,438 bytes)

317. Re: [Amps] Tuned input board on SB-220 (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Fri, 24 Mar 2006 15:47:23 -0500
If the LDG tuner can match a capacitive load simply having a capacitor from cathode to ground should do. It should switch to an L network with a capacitor input and inductor coupled to the cathode an
/archives//html/Amps/2006-03/msg00650.html (10,304 bytes)

318. [Amps] Fwd: Re: Could we *all* use the right tube part numbers? (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Wed, 29 Mar 2006 15:51:18 -0500
_______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2006-03/msg00756.html (13,748 bytes)

319. Re: [Amps] [Moon-net] 4CX250B in P-P 2m? (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Fri, 31 Mar 2006 14:01:17 -0500
I have two with a pair of 4CX250Bs. But they are in parallel not push-pull. There was an article in the Handbook using copper pipe to make a push pull amplifier 30 or 45 years ago. But those were the
/archives//html/Amps/2006-03/msg00807.html (8,930 bytes)

320. [Amps] Fwd: Re: [Moon-net] 4CX250B in P-P 2m? (score: 1)
Author: Bill Fuqua <wlfuqu00@uky.edu>
Date: Fri, 31 Mar 2006 14:02:03 -0500
OOPS I should have said 30 or 35 years ago. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2006-03/msg00808.html (8,627 bytes)

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