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Total 22 documents matching your query.

1. [AMPS] Misc. Oscillations (score: 1): Author: wb8jkr@juno.com (Mark S Graalman); Date: Sun, 5 Mar 2000 09:11:39 -0500; All, In all this clatter about random parasitics, big bangs the like, I'd like to ask a question. I don't want to get into a piss 'in match or anything but all this talk seems to be centered on high; /archives//html/Amps/2000-03/msg00154.html (8,422 bytes)
2. [AMPS] Misc. Oscillations (score: 1): Author: k7fm@teleport.com (Lamb); Date: Sun, 5 Mar 2000 07:55:40 -0800; Good Point, Mark: The simple fact is that some amplifiers are built with almost the same components that were used in the 100 watt transceivers. Bandswitches, parasitic suppressors, and even tank coi; /archives//html/Amps/2000-03/msg00159.html (8,439 bytes)
3. [AMPS] Misc. Oscillations (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 5 Mar 2000 11:29:55 -0500; Hi Guys, My DX-100's tuning capacitor is smaller than the tuning cap in a my SB-220, and every other amp I have. I can still make it arc (like I can the SB-220 cap) if I mistune the amplifier, over-d; /archives//html/Amps/2000-03/msg00162.html (9,796 bytes)
4. [AMPS] Misc. Oscillations (score: 1): Author: philk5pc@tyler.net (Phil Clements); Date: Sun, 5 Mar 2000 10:57:28 -0600; Allow me to suggest several factors that have exacerbated the "big bang" problem over the years. !. The scaling down problem. Sacrificing fair to good layouts for a more compact product with less ro; /archives//html/Amps/2000-03/msg00164.html (10,548 bytes)
5. [AMPS] Misc. Oscillations (score: 1): Author: 2@vc.net (measures); Date: Sun, 5 Mar 2000 12:10:01 -0700; ? Not one owner of an AL-80 or AL-82 that toasted one or more bandswitches has spent more than $15 to seemingly correct the problem. OTOH, AL-80s and AL-82s seemingly have above avg. stability. TL-9; /archives//html/Amps/2000-03/msg00172.html (11,086 bytes)
6. SV: [AMPS] Misc. Oscillations (score: 1): Author: sm5ki@algonet.se (sm5ki); Date: Sun, 05 Mar 2000 21:50:06 +0000; I am very often surprised that most amps on the market are allowed to be sold at all. In a compact box used in your private home, you have dangerous voltages that are isolated from your family and yo; /archives//html/Amps/2000-03/msg00177.html (14,282 bytes)
7. [AMPS] Misc. Oscillations (score: 1): Author: w8ik@arrl.net (Joe Subich, W8IK); Date: Sun, 5 Mar 2000 16:22:45 -0500; To be effective the filament rheostat would require built-in metering with proper RF decoupling at considerably more cost or would encourage semi-trained appliance operators to operate their amplifi; /archives//html/Amps/2000-03/msg00179.html (9,372 bytes)
8. [AMPS] Misc. Oscillations (score: 1): Author: 2@vc.net (measures); Date: Sun, 5 Mar 2000 14:20:12 -0700; Mouser sells submini RF chokes that have 470uH which have no resonances in the ham bands. The 100-unit price is $0.29 ea. Test points could be provided on the rear panel to connect a DMM to see what; /archives//html/Amps/2000-03/msg00184.html (10,672 bytes)
9. [AMPS] Misc. Oscillations (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Sun, 5 Mar 2000 17:22:32 -0500; Hi Joe, Right you are, but you left off the cost of a separate transformer that has only filament functions. What Rich left off was that all of the amplifiers have multiple filament taps that allow; /archives//html/Amps/2000-03/msg00185.html (9,622 bytes)
10. [AMPS] Misc. Oscillations (score: 1): Author: kc4slk@csrlink.net (Mike Sawyer); Date: Sun, 5 Mar 2000 18:39:10 -0500; Sorry Joe, I can't buy this one: If you were a commercial amplifier manufacturer, with considerably more to lose than a bit of wire an a few resistors, what would you do ... build an amplifier that m; /archives//html/Amps/2000-03/msg00193.html (9,622 bytes)
11. [AMPS] Misc. Oscillations (score: 1): Author: w8ik@arrl.net (Joe Subich, W8IK); Date: Sun, 5 Mar 2000 19:17:37 -0500; I'm not arguing that improper filament voltage doesn't shorten tube life or reduce RF output. Simply, given the design of most commercially available amateur amplifiers it would not be safe to inclu; /archives//html/Amps/2000-03/msg00197.html (10,642 bytes)
12. [AMPS] Misc. Oscillations (score: 1): Author: 2@vc.net (measures); Date: Sun, 5 Mar 2000 20:21:32 -0700; The lowly SB-220 has a separate filament-transformer. Is there a switch to select the filament tap, or muct the amplifier be disassembled to change taps.? thanks, Tom. -- FAQ on WWW: http://www.cont; /archives//html/Amps/2000-03/msg00202.html (9,832 bytes)
13. [AMPS] Misc. Oscillations (score: 1): Author: 2@vc.net (measures); Date: Sun, 5 Mar 2000 20:50:45 -0700; Adjusting filament-v is simpler than tuning a tank. Several models of Henry Radio amplifiers use approx. 6v on 3-500Z/8008 (4.8v) filaments. How safe is that, Mr Subich? -- FAQ on WWW: http://www.co; /archives//html/Amps/2000-03/msg00205.html (9,313 bytes)
14. [AMPS] Misc. Oscillations (score: 1): Author: w8ik@arrl.net (Joe Subich, W8IK); Date: Mon, 6 Mar 2000 00:39:45 -0500; It may be more simple than tuning a tank except that one does not need to open the cover to tune a tank. One must open the cover to measure filament voltage properly (directly at the filament pins).; /archives//html/Amps/2000-03/msg00209.html (8,798 bytes)
15. [AMPS] Misc. Oscillations (score: 1): Author: 2@vc.net (measures); Date: Sun, 5 Mar 2000 22:14:39 -0700; The 2 RF chokes bring the fil. v. to the test points on the rear panel. Why must one open the cover if the needed test instrument connections are on the rear panel? Put a rheostat on the fil transfo; /archives//html/Amps/2000-03/msg00212.html (9,346 bytes)
16. [AMPS] Misc. Oscillations (score: 1): Author: W8JI@contesting.com (Tom Rauch); Date: Mon, 6 Mar 2000 06:08:01 -0500; 3-500Z's have 5 volt filaments, not 4.8. Your twisting of numbers reminds me of the national budget! While running proper voltage is a good idea, the number of tubes that fail in amateur service fro; /archives//html/Amps/2000-03/msg00220.html (9,125 bytes)
17. [AMPS] Misc. Oscillations (score: 1): Author: mike@g0mjw.freeserve.co.uk (G0MJW); Date: Mon, 6 Mar 2000 11:15:11 -0000; With the exception of the 2C39A that is generally over run in amateur service. I have measured many 4CX250 industrial pulls and they were nearly all low emission. They still worked well enough. The; /archives//html/Amps/2000-03/msg00223.html (9,025 bytes)
18. [AMPS] Misc. Oscillations (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 6 Mar 2000 11:52:09 -0000; happened? One reason I saw advanced ( I can't remember where, but it was a respectable source) was that the grounded lightning conductor provided a degree of discharge of the atmosphere, thus prevent; /archives//html/Amps/2000-03/msg00226.html (9,215 bytes)
19. [AMPS] Misc. Oscillations (score: 1): Author: Donald.Kessler@wpafb.af.mil (Kessler Donald J LtCol HQ AFMC/DOOT); Date: Mon, 6 Mar 2000 10:50:48 -0500; Tom, Actually the Eimac 3-500Z brochure states the filament voltage is 5.0V +/- 0.25V. By that definition, 4.75V should also provide full emission. However, operating the filament at less than 5.0V,; /archives//html/Amps/2000-03/msg00240.html (12,385 bytes)
20. [AMPS] Misc. Oscillations (score: 1): Author: 2@vc.net (measures); Date: Mon, 6 Mar 2000 07:55:31 -0700; The rated filament potential is 4.75v to 5.25v. 4.8v is within the ratings. . So running 6v* on the filaments would actually not cause a problem in amateur service? (* <0.6% of normal emissive life); /archives//html/Amps/2000-03/msg00244.html (9,070 bytes)

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