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361. [AMPS] Re: 6m amp blocking caps (score: 1): Author: 2@vc.net (2); Date: Tue, 4 Dec 2001 12:49:45 -0800; When DC blocking caps are paralleled, a parallel-resonance is created between the capacitors in the RF output path. The additional resonance may be problematic. W6PO circuit, to 100 to - R. L. Measu; /archives//html/Amps/2001-12/msg00085.html (13,416 bytes)
362. [AMPS] involuntary vacation(?) (score: 1): Author: 2@vc.net (2); Date: Tue, 4 Dec 2001 14:04:41 -0800; // Better keep ur receiver turned on during your future trip to the hospital. I have come close to being QRTed twice in a hospital due to medical hubris. cheers, Bill - R. L. Measures, 805.386.3734,; /archives//html/Amps/2001-12/msg00087.html (7,082 bytes)
363. [AMPS] AL1500 (score: 1): Author: 2@vc.net (2); Date: Wed, 5 Dec 2001 04:32:37 -0800; // Chortle. As I understand the phenomenon, stopping a parasite with a grid-I auto-shutdown is probably not as easy as it first looks. An 8877's cathode is capable of producing over 50A of peak elec; /archives//html/Amps/2001-12/msg00093.html (10,776 bytes)
364. [AMPS] AL1500 (score: 1): Author: 2@vc.net (2); Date: Wed, 5 Dec 2001 04:32:40 -0800; // Tnx, Peter. There may be yet another manufacturing defect since, as I recall, Mr. Rauch stated that recent failures in the AL-1500 were still Eimac's fault. cheers - R. L. Measures, 805.386.3734,; /archives//html/Amps/2001-12/msg00094.html (9,655 bytes)
365. [AMPS] Re: 6m amp blocking caps (score: 1): Author: 2@vc.net (2); Date: Wed, 5 Dec 2001 04:43:40 -0800; With two doorkob caps in parallel of equal value, I got a sharp dip at c. 80MHz. I could repear rhe experiment if you like, Ian. // Why not? Is the sharp dip I see on the dipmeter a pseudo-dip? - R.; /archives//html/Amps/2001-12/msg00095.html (9,820 bytes)
366. [AMPS] AL1500 (score: 1): Author: 2@vc.net (2); Date: Wed, 5 Dec 2001 05:19:08 -0800; There is no one circuit that has this flaw. There are several. I have never seen an 8877 grid-I-trip ckt that used a >2a transistor. If you know of one, please enlighten. cheers, Ian - R. L. Measure; /archives//html/Amps/2001-12/msg00101.html (9,161 bytes)
367. [AMPS] AL1500 (score: 1): Author: 2@vc.net (2); Date: Wed, 5 Dec 2001 05:19:10 -0800; // Removing the 8877's anode cooler is not all that difficult, and it's not nearly as stinky as doing a human autopsy. Spotting the cause of death takes maybe 20-seconds when my 30x magnifier isn't; /archives//html/Amps/2001-12/msg00102.html (9,569 bytes)
368. [AMPS] AL1500 (score: 1): Author: 2@vc.net (2); Date: Wed, 5 Dec 2001 05:39:55 -0800; // see such "nonsence" at: http://www.vcnet.com/measures/bandsw.html // The Red Herring // So why did you stonewall me six times during the Grate Parasitics Debate when I asked you: is there a VHF p; /archives//html/Amps/2001-12/msg00103.html (11,301 bytes)
369. [AMPS] Re: 6m amp blocking caps (score: 1): Author: 2@vc.net (2); Date: Wed, 5 Dec 2001 06:02:03 -0800; // The issue at hand is using two, paralleled capacitors as a DC blocker. My position is one DC blocking cap with more current capability is a better choice // So Mr. Rauch was in error about the MF; /archives//html/Amps/2001-12/msg00104.html (11,072 bytes)
370. [AMPS] AL1500 (score: 1): Author: 2@vc.net (2); Date: Wed, 5 Dec 2001 07:54:16 -0800; just for a // During the Grate Parasitics Debate, our "recognized expert" clearly succeded in proving that "There is no safety in technological hubris" and that his opponent would not make an under-; /archives//html/Amps/2001-12/msg00111.html (9,881 bytes)
371. [AMPS] Re: 6m amp blocking caps (score: 1): Author: 2@vc.net (2); Date: Wed, 5 Dec 2001 07:54:20 -0800; // Didn't Tom say that the dipper option for the MFJ antenna analyzer is disfunctional? - R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures. end -- FAQ on WWW: http://www.contesting.com/FAQ/; /archives//html/Amps/2001-12/msg00112.html (10,083 bytes)
372. [AMPS] AL1500 (score: 1): Author: 2@vc.net (2); Date: Wed, 5 Dec 2001 07:54:22 -0800; // Out of the last five 8877s I autopsied, only one indicated parasite damage (loose gold) -- which came from an out-of-warranty AL-1500 amplifier. // One of the two tubes in my SB-220 was manufactu; /archives//html/Amps/2001-12/msg00113.html (10,554 bytes)
373. [AMPS] AL1500 (score: 1): Author: 2@vc.net (2); Date: Wed, 5 Dec 2001 08:02:27 -0800; // Some Alphas apparently C-E-short their interrupt transistor. // If grid-overcurrent protection circuits worked I would not be seeing kaput 8877s with loose gold about. - R. L. Measures, 805.386.3; /archives//html/Amps/2001-12/msg00115.html (9,431 bytes)
374. [AMPS] Re: 6m amp blocking caps (score: 1): Author: 2@vc.net (2); Date: Wed, 5 Dec 2001 13:29:58 -0800; // Do two equal-capacitance paralleled caps have a resonance? // Mr. Rauch stated that the dipmeter adapter does not work correctly. // In my experiences 50, 57, and 58 Series doorknob caps have a r; /archives//html/Amps/2001-12/msg00122.html (11,632 bytes)
375. [AMPS] AL1500 (score: 1): Author: 2@vc.net (2); Date: Wed, 5 Dec 2001 13:29:56 -0800; // Fast enough is no observable damage to the electron tube with a high-pot tester, Over-current fuses open to limit current, but over-current transistors often short, which does not limit current.; /archives//html/Amps/2001-12/msg00123.html (9,886 bytes)
376. [AMPS] AL1500 (score: 1): Author: 2@vc.net (2); Date: Wed, 5 Dec 2001 18:11:50 -0800; \ The active device whose job is to interrupt the flow of grid current. The amplifier that the gold-sputtered 8877 in Figure 24 on my Web site was removed from a AL-1500, which has a grid "protectio; /archives//html/Amps/2001-12/msg00133.html (10,100 bytes)
377. [AMPS] AL1500 (score: 1): Author: 2@vc.net (2); Date: Wed, 5 Dec 2001 18:11:52 -0800; \ Overdrive normally flakes off the cathode's emissive coating. There's a photograph of a flaked cathode in "Parasitics Revisited" in the September/October 1990 issue of *QST*. As can be seen in the; /archives//html/Amps/2001-12/msg00134.html (10,409 bytes)
378. [AMPS] AL1500 (score: 1): Author: 2@vc.net (2); Date: Wed, 5 Dec 2001 20:15:53 -0800; \ Perhaps grid-current does not stop soon enough? The 77 has a history of gold-sputtering 8877s. Beats me. tnx, Paul - R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures. end -- FAQ on WWW: h; /archives//html/Amps/2001-12/msg00136.html (11,024 bytes)
379. [AMPS] AL1500 (score: 1): Author: 2@vc.net (2); Date: Wed, 5 Dec 2001 20:35:56 -0800; Agreed, however, this was way after the heat dam mfg defect was corrected, and most amp builders knew it. As I see it, most of us knew that Henry, Alpha, Dentron and all the rest used parasitic supp; /archives//html/Amps/2001-12/msg00137.html (9,065 bytes)
380. [AMPS] Re: 6m amp blocking caps (score: 1): Author: 2@vc.net (2); Date: Thu, 6 Dec 2001 06:38:16 -0800; \ This does not appear to be the result when one experimentally parallels two, equal value doorknob caps with straps and checks for resonance with a dipmeter. \ semi-agreed \ Certainly - for finding; /archives//html/Amps/2001-12/msg00145.html (11,005 bytes)

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