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241. [Amps] ALPHA 77 SX UPDATE (score: 1): Author: 2@vc.net (2); Date: Thu, 22 Aug 2002 06:38:01 -0700; Squirreliness = marginal VHF/UHF stability. Agreed, however, more feedback-C is hardly good news because it is built into the tube and it is not adjustable. Multi-tube amps also have multiples of th; /archives//html/Amps/2002-08/msg00201.html (11,503 bytes)
242. [Amps] 3-500Z parasitic wows (score: 1): Author: 2@vc.net (2); Date: Thu, 22 Aug 2002 21:16:17 -0700; original ** In my opinion, there is no such thing as a random grid/filament short unless there is too much filament inrush current or the tube is operated horizontally for more than several months.; /archives//html/Amps/2002-08/msg00216.html (9,702 bytes)
243. [Amps] 3-500Z parasitic wows (score: 1): Author: 2@vc.net (2); Date: Thu, 22 Aug 2002 21:16:23 -0700; ** 10x is a new record. The highest I've seen is 8x. Congrats, Tom. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-08/msg00217.html (9,623 bytes)
244. [Amps] 3-500's and stability (score: 1): Author: 2@vc.net (2); Date: Thu, 22 Aug 2002 21:16:20 -0700; ** Thanks for the t measurement on the 940. 6mS is quick. I agree that hotswitching produces the kind of anode-current transients that are ideal for ringing the anodes' VHF-resonant circuit between; /archives//html/Amps/2002-08/msg00218.html (9,613 bytes)
245. [Amps] 3-500Z parasitic wows (score: 1): Author: 2@vc.net (2); Date: Fri, 23 Aug 2002 06:32:01 -0700; G. W. Flyer of GE (1935), H. F Dittrich of Phillips (1958), and ARRL's F. E. Handy (1926) arrived at a different conclusion than RCA's Rocky Point investigation. [Dittrich, H. F.; *Tubes for R. F. H; /archives//html/Amps/2002-08/msg00220.html (9,980 bytes)
246. [Amps] Alpha 374A problems (score: 1): Author: 2@vc.net (2); Date: Fri, 23 Aug 2002 18:50:44 -0700; ** grid/cathode shorts are typically caused by cathode flaking. [ photos in Sept/Oct 1990 *QST* ] This can result from inadequate warm-up, more than 350mA continuous cathode-current, or an intermitt; /archives//html/Amps/2002-08/msg00242.html (6,873 bytes)
247. [Amps] 3-500Z parasitic wows (score: 1): Author: 2@vc.net (2); Date: Fri, 23 Aug 2002 18:50:40 -0700; ** agreed ** I have seen gassy tubes, but I have never seen one damage a VHF parasitic suppressor resistor.. ** Protecting an already gassy tube makes little sense to me. ** I have seen them. ** To; /archives//html/Amps/2002-08/msg00243.html (12,923 bytes)
248. [Amps] rocky point effect, barnacle bill (score: 1): Author: 2@vc.net (2); Date: Fri, 23 Aug 2002 18:50:46 -0700; ** Rich has never seen it in tubes that use under 10kVDC. ** impressive indeed. ** this discussion is about tubes that are commonly used in Ham amplifiers -- and I don't mean JA contest stations tha; /archives//html/Amps/2002-08/msg00244.html (11,965 bytes)
249. [Amps] 3-500Z parasitic wows (score: 1): Author: 2@vc.net (2); Date: Fri, 23 Aug 2002 18:50:51 -0700; ** the bang is too loud for transmitted sound through the anode stem. The bang sounds like an air burst to me. I've heard them as loud as a 12ga shotgun blast. [8170] ** The concurrent flash seems t; /archives//html/Amps/2002-08/msg00245.html (8,498 bytes)
250. [Amps] rocky point effect, barnacle bill (score: 1): Author: 2@vc.net (2); Date: Fri, 23 Aug 2002 18:50:54 -0700; ** does the AL-800 use a glitch resistor? - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-08/msg00246.html (7,320 bytes)
251. [Amps] bangs in 3cx800 (score: 1): Author: 2@vc.net (2); Date: Sat, 24 Aug 2002 15:11:04 -0700; ** On p.14, Kenwood's TL-922 manual talks about "normal arcing" in the tank. Those with access to a spectrum analyzer know that normal arcing and bangs coincide with a signal intermittently being ge; /archives//html/Amps/2002-08/msg00254.html (8,600 bytes)
252. [Amps] rocky point effect, barnacle bill (score: 1): Author: 2@vc.net (2); Date: Sat, 24 Aug 2002 15:11:08 -0700; Rectangular power resistors are ceramic. They tend to make schrapnel when they open. Wirewound glass-coated resistors are round. They can withstand more joules of overload than similar rectangular c; /archives//html/Amps/2002-08/msg00255.html (8,147 bytes)
253. [Amps] rocky point effect, barnacle bill (score: 1): Author: 2@vc.net (2); Date: Sat, 24 Aug 2002 15:11:10 -0700; ** MFJ/Ameritron's chief engineer, Mr. Tom Rauch, apparently does not employ glitch resistors in Ameritron amps. He said there's enough ESR in the electrolytic capacitors to do the job. Modern elect; /archives//html/Amps/2002-08/msg00256.html (10,743 bytes)
254. [Amps] Re: diode and glitch resistor (score: 1): Author: 2@vc.net (2); Date: Sat, 24 Aug 2002 15:44:30 -0700; Agreed 2, 10-ohm, 10Wers in series would be enough for glitch protection, but a huskier, 3A diode would still be needed. cheerz, Steve - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.; /archives//html/Amps/2002-08/msg00257.html (6,985 bytes)
255. [Amps] bangs in 3cx800 (score: 1): Author: 2@vc.net (2); Date: Sat, 24 Aug 2002 15:54:44 -0700; To be clean, tetrode and pentode amplifiers should be tuned to the tube mfg's specified screen current, when peaked with the Tune-C. Less screen current =s heavier loading =s less imd. Zero grid curr; /archives//html/Amps/2002-08/msg00258.html (8,794 bytes)
256. [Amps] rocky point effect, barnacle bill (score: 1): Author: 2@vc.net (2); Date: Sun, 25 Aug 2002 07:21:16 -0700; Apparently, Tom is beginning to come around. A few years back he said that glitch resistors were not needed due the high ESR of the filter caps Ameritron uses*. Who knows? - maybe someday Tom will r; /archives//html/Amps/2002-08/msg00264.html (13,530 bytes)
257. [Amps] Re: diode and glitch resistor (score: 1): Author: 2@vc.net (2); Date: Sun, 25 Aug 2002 07:21:22 -0700; The critical thing for a WW R in glitch service is V-gradient. 10w, 14w and 25w units are c. 50mm long. Thus they have similar glitch protection ability. However, glass-coating appears to be superio; /archives//html/Amps/2002-08/msg00265.html (8,897 bytes)
258. [Amps] Amperex with Eimac Tubes (score: 1): Author: 2@vc.net (2); Date: Sun, 25 Aug 2002 07:21:19 -0700; Eimacs have a lower Mu than Amperex. Thus, they have different bias requirements, [roughly 5v] - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-08/msg00266.html (6,986 bytes)
259. [Amps] Heathkit SB-220 Schematic (score: 1): Author: 2@vc.net (2); Date: Sun, 25 Aug 2002 18:21:02 -0700; www.vcnet.com/measures - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end; /archives//html/Amps/2002-08/msg00274.html (6,529 bytes)
260. [Amps] Which Amp (score: 1): Author: 2@vc.net (2); Date: Mon, 26 Aug 2002 15:39:40 -0700; A grid-filament shorted tube does not blow grid the resistor because 0V from grid to cathode makes 0mA of grid current. A grid-filament short causes the tube to draw some idling current on standby b; /archives//html/Amps/2002-08/msg00281.html (13,015 bytes)

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