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21. [AMPS] PA Recommendation Wanted (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Sat, 7 Jun 1997 00:14:17 +0000; Right. By the time you see it on a meter, your signal is often a mess. A peak detector with a hold circuit (perhaps driving an LED) would be a good idea. I also like Ian's suggestion of building the; /archives//html/Amps/1997-06/msg00077.html (10,015 bytes)
22. [AMPS] PA Recommendation Wanted (score: 1): Author: measures@vc.net (Rich Measures); Date: Sat, 7 Jun 97 03:24:47 -0700; ...snip... ...snip... Amen to that, Carl. 3mA to 10mA of grid current is bad news for a 4CX10000A. For a pair of 4CX800As, its downtown nutsville. OTOH, there is no FCC spec. for spurious feculence/; /archives//html/Amps/1997-06/msg00079.html (9,789 bytes)
23. [AMPS] PA Recommendation Wanted (score: 1): Author: measures@vc.net (Rich Measures); Date: Sat, 7 Jun 97 03:24:50 -0700; ...snip... Air flows quite well around a cylinder. A candle can easily be blown out with a cardboard-tube core from a roll of paper towels held in front of the candle. As long as the fan blade that b; /archives//html/Amps/1997-06/msg00080.html (9,545 bytes)
24. [AMPS] PA Recommendation Wanted (score: 1): Author: measures@vc.net (Rich Measures); Date: Sat, 7 Jun 97 05:50:21 -0700; 100% of the time is undoubtedly often. Why not adjust the grid bias V so that the grid can not draw current with max. drive applied? Eimac says you don't need a regulated bias supply.. From my exper; /archives//html/Amps/1997-06/msg00082.html (9,994 bytes)
25. [AMPS] PA Recommendation Wanted (score: 1): Author: measures@vc.net (Rich Measures); Date: Sat, 7 Jun 97 05:50:24 -0700; About 2/3 of the 80 series owners I asked reported essentially the same thing, Jim. However, a return rate of 33% is nothing to crow about. IMO, there is at least one marginal area in the 80 series; /archives//html/Amps/1997-06/msg00083.html (9,272 bytes)
26. [AMPS] PA Recommendation Wanted (score: 1): Author: measures@vc.net (Rich Measures); Date: Sat, 7 Jun 97 05:50:26 -0700; This isn't surprizing to me, Bill. The designer of the AL-1200's tank has made some eyebrow-raising statements regarding RF skin-effect. Consider the ratings of the E.F Johnson (now made by Multroni; /archives//html/Amps/1997-06/msg00084.html (10,966 bytes)
27. [AMPS] PA Recommendation Wanted (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 7 Jun 1997 08:13:09 +0100; "Match" in the sense of "adjust to be compatible" - oops, sorry, wrong newsgroup! Carl is right on two points. It's the operators and the power supplies that are to blame, not the tubes themselves. T; /archives//html/Amps/1997-06/msg00088.html (10,232 bytes)
28. [AMPS] PA Recommendation Wanted (score: 1): Author: measures@vc.net (Rich Measures); Date: Sat, 7 Jun 97 11:20:30 -0700; (Carl) Sure, Carl, such a cooling arrangement is not as well-engineered as the SB-220's cooling system, but if one blows enough air it just might fly,. Rich-- R. L. Measures, 805-386-3734, AG6K -- F; /archives//html/Amps/1997-06/msg00089.html (9,203 bytes)
29. [AMPS] PA Recommendation Wanted (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 7 Jun 1997 20:11:01 +0100; Not all tetrodes require grid bias voltages that conveniently match up to the available drive power and the grid swamping resistance. Adjusting the grid bias may work for Rich's amplifiers because th; /archives//html/Amps/1997-06/msg00091.html (11,219 bytes)
30. [AMPS] PA Recommendation Wanted (score: 1): Author: km1h@juno.com (km1h@juno.com); Date: Sat, 07 Jun 1997 17:57:17 EDT; Hi Ian, you might want to publish the EU Clean Signal Contest rules to the VHF Reflector. If you are no longer subscribed there send them to me and I will repost. It might actually interest a few of; /archives//html/Amps/1997-06/msg00094.html (9,248 bytes)
31. [AMPS] PA Recommendation Wanted (score: 1): Author: KR4DAGRIP@aol.com (KR4DAGRIP@aol.com); Date: Sat, 7 Jun 1997 18:15:51 -0400 (EDT); << BTW, even 3ma of grid current in an AB1 amp will cause splatter. If you can see that much on a meter, the real peaks are a lot worse. 73....Carl KM1H >> Sorry Carl, Cockpit trouble here 91b is AB2; /archives//html/Amps/1997-06/msg00096.html (9,343 bytes)
32. [AMPS] PA Recommendation Wanted (score: 1): Author: measures@vc.net (Rich Measures); Date: Sat, 7 Jun 97 20:29:34 -0700; ... My strategy, Ian, is to choose a value of grid termination resistance that roughly affords the needed peak RF drive V to the grid with exciters that develop 100v-p (100w rms) to 141v-p (200w rms; /archives//html/Amps/1997-06/msg00099.html (12,070 bytes)
33. [AMPS] PA Recommendation Wanted (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 8 Jun 1997 11:53:40 +0100; OK, that makes sense, but until now I don't recall you mentioning the need for a range of input transformer ratios to bring everything into roughly the right ball-park. Ah... I do not interpret that; /archives//html/Amps/1997-06/msg00103.html (11,938 bytes)
34. [AMPS] PA Recommendation Wanted (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 8 Jun 1997 16:36:57 +0100; The RSGB VHF/UHF contest rules and Code of practice are at http://ourworld.compuserve.com/homepages/txrx/97genrul.htm They are mostly off-topic for Amps, so here is a very brief summary. Nobody is pe; /archives//html/Amps/1997-06/msg00105.html (10,712 bytes)
35. [AMPS] PA Recommendation Wanted (score: 1): Author: measures@vc.net (Rich Measures); Date: Sun, 8 Jun 97 11:28:14 -0700; It's discussed briefly in Figure 5 in *Amplifiers*. However, only two examples are given: the bifilar-stepup (200 ohm grid termination), and the trifilar-stepup (450 ohm grid termination). In my opi; /archives//html/Amps/1997-06/msg00106.html (12,358 bytes)
36. [AMPS] PA Recommendation Wanted (score: 1): Author: W8IK@IBM.NET (Joe Subich, W8IK); Date: Sun, 08 Jun 1997 20:33:22 -0400; However, by adjusting the screen voltage one changes the gain of the tube and risks excessive screen dissipation. That is, screen voltage too low and stage ouptut is low with attendant overdrive and; /archives//html/Amps/1997-06/msg00108.html (9,565 bytes)
37. [AMPS] PA Recommendation Wanted (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Mon, 9 Jun 1997 00:21:43 +0000; That's correct Ian. That's why Eimac strongly disagreed with suggestions to use "grid fuses" unless they are accompanied with proper shunt resistances. Eimac usually give a grid and screen voltage t; /archives//html/Amps/1997-06/msg00114.html (12,139 bytes)
38. [AMPS] PA Recommendation Wanted (score: 1): Author: measures@vc.net (Rich Measures); Date: Mon, 9 Jun 97 03:55:19 -0700; Mr. Subich's scenario would be possible IF the operator did not know how to adjust the tune and load controls in a Class AB1 amplifier, AND the amplifier's designer FORGOT to include screen protecti; /archives//html/Amps/1997-06/msg00120.html (9,364 bytes)
39. [AMPS] PA Recommendation Wanted (score: 1): Author: measures@vc.net (Rich Measures); Date: Mon, 9 Jun 97 03:55:17 -0700; .. Did Rich say that the screen can be operated above its max. V rating? It looks like I'm going to have to draw Tom a map. ....... Here's Rich's method. The needed bias for a 4CX1000A is 70 V with; /archives//html/Amps/1997-06/msg00121.html (11,862 bytes)
40. [AMPS] PA Recommendation Wanted (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 9 Jun 1997 14:21:59 +0100; Funny that Eimac allow 5mA on peaks, if you read the whole data sheet. Only if you can promise never, never, never to run any grid current at all! With an output resistance that high, the slightest t; /archives//html/Amps/1997-06/msg00130.html (9,849 bytes)

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