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1. [AMPS] Screen Supplys (score: 1): Author: daveb@buffnet.net (daveb); Date: Tue, 18 Nov 1997 22:04:44 -0500; Hi I recall a recent very good article about tetrode screen supplys in QST or QEX. Cant recall which one or the issue. Anyone have that info handy Thanks --db-- (AA2GF) -- FAQ on WWW: http://www.cont; /archives//html/Amps/1997-11/msg00256.html (7,517 bytes)
2. [AMPS] Screen Supplys (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 19 Nov 97 01:23:04 -0800; For small tetrodes with less than roughly 800v screens, a zener-string shunt regulator works best. For larger tetrodes, a 723-based positive floating series pass regulator has advantages. You can fi; /archives//html/Amps/1997-11/msg00259.html (7,962 bytes)
3. [AMPS] Screen Supplys (score: 1): Author: davek@medphys.ucl.ac.uk (Dave Kirkby); Date: Wed, 19 Nov 1997 11:21:02 +0000; There is some data on G3SEK's web page, by GW4FRX, on the IMD performance of 4CX350s (which need about 400 V) using:1) A well stabilised screen supply. 2) The screen stabilised supply with a resisto; /archives//html/Amps/1997-11/msg00265.html (9,294 bytes)
4. [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)
5. [AMPS] Screen Supplys (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 19 Nov 97 06:44:02 -0800; Not likely unless the zeners are improperly-biased and/or are defective. Small tetrodes have the somewhat unpleasant habit of generating potentially-fatal reverse screen current. A shunt regulator i; /archives//html/Amps/1997-11/msg00269.html (9,319 bytes)
6. [AMPS] Screen Supplys (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 19 Nov 97 07:07:45 -0800; Volts are volts. It matters not what type of regulator they come from, unless the regulator is performing poorly. True indeed, Mr. White. But note that essentially the same information can be found; /archives//html/Amps/1997-11/msg00271.html (8,876 bytes)
7. [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)
8. [AMPS] Screen Supplys (score: 1): Author: measures@vc.net (Rich Measures); Date: Wed, 19 Nov 97 12:19:46 -0800; I plead guilty, your honor. Simply stating that shunt regulators result in IMD does not suffice. Shunt vs. series regulated screen supplies are discussed in Part 4: -- Quoting: "Advantages of Shunt; /archives//html/Amps/1997-11/msg00275.html (11,486 bytes)
9. [AMPS] Screen Supplys (score: 1): Author: w8jitom@postoffice.worldnet.att.net (w8jitom@postoffice.worldnet.att.net); Date: Thu, 20 Nov 1997 08:15:59 +0000; Hi Ian, I certainly agree with you Ian. Zeners make poor regulators for screen supplies unless you use some type of gain loop to reduce the effective ESR of the supply, and hold the current in the z; /archives//html/Amps/1997-11/msg00285.html (8,610 bytes)
10. [AMPS] Screen Supplys (score: 1): Author: measures@vc.net (Rich Measures); Date: Thu, 20 Nov 97 09:29:27 -0800; I recommend using a string of10v to 30v 5w zeners. They have minimal dynamic R. When a sufficient capacitor is connected in parallel they seem to work okay. In my (2) 7580W amplifier, the screen cur; /archives//html/Amps/1997-11/msg00293.html (8,562 bytes)

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