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241. [AMPS] SV: G2DAF and super cathode (score: 1): Author: k7fm@teleport.com (Lamb); Date: Thu, 16 Dec 1999 22:03:05 -0800; I did not say that RCA recommended the G2DAF circuit. What I did say was that RCA published and recommended a circuit where the screen was not regulated. It simply means that a blanket statement that; /archives//html/Amps/1999-12/msg00202.html (8,560 bytes)
242. [AMPS] 4CX250 in G2DAF Circuit (score: 1): Author: k7fm@teleport.com (Lamb); Date: Thu, 16 Dec 1999 22:14:39 -0800; The reported instance instance of one G2DAF amplifier with a -22 db 3rd order distortion is within 10% of the published specifications of the 4CX250B tube using a closely regulated screen voltage. Ca; /archives//html/Amps/1999-12/msg00203.html (8,045 bytes)
243. [AMPS] 4CX250 in G2DAF Circuit (score: 1): Author: k7fm@teleport.com (Lamb); Date: Fri, 17 Dec 1999 06:40:45 -0800; Examining the cited test results was not intended to prove that the G2DAF circuit was a good circuit or that the stated Eimac specifications could not be improved. It was merely intended to question; /archives//html/Amps/1999-12/msg00210.html (10,174 bytes)
244. [AMPS] 4CX250 in G2DAF Circuit (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Fri, 17 Dec 1999 10:31:34 -0800; The second test with an 813 was somewhat discounted because I have no specs from anyone on what the distortion products are when grid driven with a regulated screen. Suppose they are -18 db 3rd order; /archives//html/Amps/1999-12/msg00214.html (9,051 bytes)
245. [AMPS] 4CX250 in G2DAF Circuit (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Fri, 17 Dec 1999 15:50:39 -0800; I do not have the exact wording at this computer of prior statements, but I do recall that Rich stated that the G2DAF failed two actuals tests. The first was with an 813 tube and the second was with; /archives//html/Amps/1999-12/msg00217.html (10,798 bytes)
246. [AMPS] drive derived screen potential (score: 1): Author: k7fm@teleport.com (Lamb); Date: Sun, 19 Dec 1999 08:46:14 -0800; Hi Skipp: There are perhaps 2 other reasons to use a circuit which derives screen voltage from the drive. The first is that it reduces dissipation in proportion to the speech, so that it is zero whil; /archives//html/Amps/1999-12/msg00234.html (10,349 bytes)
247. [AMPS] More and More and More and More - drive derived screen potential (score: 1): Author: k7fm@teleport.com (Lamb); Date: Sun, 19 Dec 1999 21:28:12 -0800; Rich: You keeping adding new twists to assure failure. Your statement . "The DAF runs heavy grid current" is no more true than the statement that any grounded amplifier draws heavy current. At maximu; /archives//html/Amps/1999-12/msg00261.html (9,305 bytes)
248. [AMPS] More and More and More and More - drive derived screen potential (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Mon, 20 Dec 1999 09:16:44 -0800; And if the power output was 20% higher than normal of the G2DAF design, that is a sign that the amplifier was overdriven. Since the plate efficiency is no different than the "standard" configuration,; /archives//html/Amps/1999-12/msg00282.html (9,625 bytes)
249. [AMPS] More Plus: Drive derived screen voltage (score: 1): Author: k7fm@teleport.com (Lamb); Date: Mon, 20 Dec 1999 22:49:01 -0800; It is not essential to have a constant gain in an amplifier to have acceptable distortion. The G2DAF circuit is variable in gain, but it is simply one of a number of variables that can be explored. A; /archives//html/Amps/1999-12/msg00302.html (9,835 bytes)
250. [AMPS] BeO Cautions (score: 1): Author: k7fm@teleport.com (Lamb); Date: Mon, 20 Dec 1999 22:56:16 -0800; Does this caution mean that I have to stop my recreational practice of drilling through power transistors? K7FM -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com; /archives//html/Amps/1999-12/msg00303.html (8,571 bytes)
251. [AMPS] 2 TONE TESTS OF G2DAF CIRCUIT (score: 1): Author: k7fm@teleport.com (Lamb); Date: Wed, 22 Dec 1999 15:59:11 -0800; Question: If the G2DAF circuit distorts because it draws too much grid current, then how could it a 2 tone test? Assuming it passes two tone testing, that would mean that even if the G2DAF draws subs; /archives//html/Amps/1999-12/msg00349.html (7,514 bytes)
252. [AMPS] Fw: Two Tone Tests (score: 1): Author: k7fm@teleport.com (Lamb); Date: Wed, 22 Dec 1999 21:12:42 -0800; not the concentrating -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com S; /archives//html/Amps/1999-12/msg00351.html (7,951 bytes)
253. [AMPS] Plotting of screen voltage variation (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Thu, 23 Dec 1999 08:48:44 -0800; I am presently assembling a test bench to perform "grid-shift" transconductance testing according to standards set forth in the RCA receiving tube manual. I will be using a beam power tube and varyin; /archives//html/Amps/1999-12/msg00362.html (10,046 bytes)
254. [AMPS] Plotting of Screen Voltage Variations (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Thu, 23 Dec 1999 09:53:15 -0800; This is a multi-part message in MIME format. --=_NextPart_000_003E_01BF4D2B.88834520 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I am presently assembli; /archives//html/Amps/1999-12/msg00365.html (13,892 bytes)
255. [AMPS] daf amplifier circuit (score: 1): Author: k7fm@teleport.com (Lamb); Date: Fri, 31 Dec 1999 07:02:30 -0800; The argument that "if it was a great circuit, all of the amplifier companies would be using it" is not a satisfactory answer. The Wright canard style aircraft has much to offer over a standard aircra; /archives//html/Amps/1999-12/msg00419.html (9,788 bytes)
256. [AMPS] Regulated Screen (score: 1): Author: k7fm@teleport.com (Colin Lamb); Date: Fri, 31 Dec 1999 08:42:29 -0800; A "regulated" screen voltage does not make a perfect linear amplifier. Examine the "Ultra-Linear" (also known as the Williamson) amplifier design. A few of these audio amplifiers were sold by Heath a; /archives//html/Amps/1999-12/msg00422.html (9,351 bytes)
257. [AMPS] The 3/2 Power Law (score: 1): Author: k7fm@teleport.com (Lamb); Date: Fri, 31 Dec 1999 16:14:16 -0800; Rich: The 3/2 power law is being used as a smoke screen and does not prove the G2DAF, or any other amplifier that changes screen voltage as a result of drive, will not work. The 3/2 power law simply; /archives//html/Amps/1999-12/msg00448.html (7,968 bytes)
258. [AMPS] Whither the 807? (score: 1): Author: k7fm@teleport.com (Lamb); Date: Mon, 1 Nov 1999 16:51:30 -0800; 807's were drunk when hams built their own rigs. It paralleled the growth of television. After work at the mines, the ham would come home and fire up the home brew rig. But neighbors would complain a; /archives//html/Amps/1999-11/msg00054.html (9,061 bytes)
259. Re: [Amps] anyone else been contacted? (score: 1): Author: "k7fm" <k7fm@teleport.com>; Date: Mon, 1 Sep 2003 07:42:06 -0700; Even cash is suspect. It could be counterfeited or money from the DB Cooper hijack that the FBI will confiscate. Best solution is to keep collecting the stuff and fill the barn with it. NEVER SELL AN; /archives//html/Amps/2003-09/msg00005.html (8,536 bytes)
260. Re: [Amps] Mail Order Operations (score: 1): Author: "k7fm" <k7fm@teleport.com>; Date: Thu, 4 Sep 2003 06:32:07 -0700; For years I had faith that I could send my money safely to a ham and I would receive what I paid for. That changed early this year. I saw a Wavetek 3003 signal generator advertised. I received a phot; /archives//html/Amps/2003-09/msg00036.html (8,950 bytes)

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