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321. [AMPS] matching (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 1 Dec 1997 13:54:13 +0000; "Resistive, but not dissipative" would be closer to the mark. The article uses the term "impedance" in the sense of being the ratio of voltage/current observed at a particular location. To the extent; /archives//html/Amps/1997-12/msg00011.html (8,012 bytes)
322. [AMPS] parasitic suppressors (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 8 Dec 1997 15:53:19 +0000; The normal definition of "boiling point" is the temperature at which the vapor pressure of the liquid or solid equals the surrounding pressure - which is rather meaningless under high-vacuum conditio; /archives//html/Amps/1997-12/msg00136.html (9,494 bytes)
323. [AMPS] parasitic suppressors (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 9 Dec 1997 07:49:04 +0000; All you know for sure from the photograph is - quite literally - that "The cathode coating is flaking off, the gold plating is not." That is ALL you know for sure. The evidence is not sufficient to p; /archives//html/Amps/1997-12/msg00175.html (10,618 bytes)
324. [AMPS] parasitic suppressors (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 9 Dec 1997 17:17:07 +0000; Quite so: I see the microscope photographs, but I see no parasitics :-) (Sorry, Rich, that was a cheap shot but I just couldn't resist!) 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice'; /archives//html/Amps/1997-12/msg00184.html (9,644 bytes)
325. [AMPS] HV glitch resistor/fuse? (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 10 Dec 1997 07:47:10 +0000; Unfortunately that still leaves another fuse, namely the grid wires inside the tube. It's difficult to guarantee that the "real" fuse will blow before letting through enough energy to damage the tube; /archives//html/Amps/1997-12/msg00197.html (10,150 bytes)
326. [AMPS] parasitic suppressors (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 11 Dec 1997 07:25:28 +0000; Let's try to stay with detailed circuit analysis, and not fall back to vague arguments based on "lots of RF around". Rich is obviously correct in saying that the bias zener is not in the path of a su; /archives//html/Amps/1997-12/msg00211.html (10,117 bytes)
327. [AMPS] parasitic suppressors (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 11 Dec 1997 22:10:22 +0000; km1h @ juno.com wrote (replying to me): Sorry, Carl, I didn't mean that to come across as flippant. I was just trying to encourage everybody not to back away into generalities when things become hard; /archives//html/Amps/1997-12/msg00230.html (10,273 bytes)
328. [AMPS] parasitic suppressors (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 11 Dec 1997 22:03:58 +0000; It doesn't matter which individuals first wrote the bulletin, commented on the draft, authorized its release and so on... You have to accept that the statements in the Application Bulletin as publish; /archives//html/Amps/1997-12/msg00231.html (9,591 bytes)
329. [AMPS] parasitic suppressors (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Fri, 12 Dec 1997 08:49:02 +0000; No, of course not - for example, I argue strongly against EIMAC's recommendations for "linear" operating condx for the 4CX250R. But if the company disgrees with me, I don't try to isolate individual; /archives//html/Amps/1997-12/msg00245.html (9,944 bytes)
330. [AMPS] parasitic suppressors (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 13 Dec 1997 09:23:53 +0000; EIMAC Application Bulletin #17 applies the 4J limit to "oxide cathode tube types up to about 1500 watts plate dissipation". That puts the 8877 right on the borderline. No doubt it is much more capabl; /archives//html/Amps/1997-12/msg00271.html (11,493 bytes)
331. [AMPS] 4CX250Rs (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 14 Dec 1997 15:13:46 +0000; Not the way that EIMAC recommend, with 400V on the screen and -80V on the grid. The EIMAC recommendations have earned 4CX250Rs a poor reputation for IMD - basically because they are too greedy for po; /archives//html/Amps/1997-12/msg00285.html (10,667 bytes)
332. [AMPS] G2DAF amps (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 15 Dec 1997 13:12:03 +0000; To simulate the whole spectral content of speech, you'd have to go all the way down to about 1Hz (the word or syllable rate) for the third 'tone' because this is where many poorly-regulated anode and; /archives//html/Amps/1997-12/msg00302.html (8,276 bytes)
333. [AMPS] parasitic suppressors (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 16 Dec 1997 11:30:20 +0000; Still searching for an explanation why an anode-grid arc might blow the cathode zener, something might have come up from an off-list exchange with K5GW (reproduced here with permission). No - and may; /archives//html/Amps/1997-12/msg00308.html (13,151 bytes)
334. [AMPS] parasitic suppressors (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 16 Dec 1997 22:41:23 +0000; OK, we're nearly in agreement. However, if the grid current meter is damaged, it is clear that the shunt and/or the diode didn't do the job. A surge of say 50A comes up through the grid meter shunt,; /archives//html/Amps/1997-12/msg00311.html (12,999 bytes)
335. [AMPS] parasitic suppressors (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 17 Dec 1997 08:58:22 +0000; That isn't the dominant time constant in a near-crowbar short. If the arc voltage is about 50V and the current is about 50A, R is on the order of one ohm, so R*C is a few tens of microseconds. Theref; /archives//html/Amps/1997-12/msg00316.html (8,753 bytes)
336. [AMPS] Screen Supplys (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 19 Nov 1997 11:56:47 +0000; But note also that a series regulator cannot handle reverse screen current, which many tetrodes can generate. You MUST use a shunt resistor from screen to cathode, that permanently passes the maximum; /archives//html/Amps/1997-11/msg00267.html (9,242 bytes)
337. [AMPS] Screen Supplys (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 19 Nov 1997 17:13:46 +0000; You surely don't mean that, Rich. Under conditions of varying current demand, some types of voltage regulators obviously have a lower output impedance than others. If you look at the datasheets, you; /archives//html/Amps/1997-11/msg00273.html (10,032 bytes)
338. [AMPS] Thanks For The K2RIW Info. (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 25 Nov 1997 07:23:35 +0000; It is published independently, but says "RSGB" on the spine because RSGB bought the whole second print run - a kind of "badge engineering". AFAIK, ARRL still stocks the book. If it's temporarily out; /archives//html/Amps/1997-11/msg00350.html (7,413 bytes)
339. [AMPS] volts (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 6 Oct 1997 13:51:24 +0100; "Blown clear" is not quite what happens. With the kinds of voltages used in house wiring and amateur radio, there's not enough electrical energy available to propel a human body. The shock causes a v; /archives//html/Amps/1997-10/msg00033.html (8,792 bytes)
340. [AMPS] Bird Thruline Line Section Question (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 16 Oct 1997 13:59:56 +0100; You'd have to check with the Bird catalog or the web site. I have one photocopied page here which doesn't show your part number, but it does show a wide range of meter currents and resistances. Many; /archives//html/Amps/1997-10/msg00099.html (8,502 bytes)

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