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1. [Amps] Q: Chimneys for 3-500/4-400?? (score: 1)
Author: (COLIN LAMB)
Date: Tue, 3 Dec 2002 11:20:13 -0800
Coleman still makes them and they althoiugh they have gone from cheap to inexpensive. The real cost is all the neat other stuff you buy when you go to buy the lantern chimneys. Colin K7FM To: <amps@c
/archives//html/Amps/2002-12/msg00045.html (10,245 bytes)

2. [Amps] Matching tubes by exhaust heat? (score: 1)
Author: (COLIN LAMB)
Date: Mon, 16 Dec 2002 20:51:32 -0800
Question? As the emission of a tube drops, does the efficiency % (ratio of output to input) stay relatively constant? If the plate current simply decreases while the efficiency remains constant, then
/archives//html/Amps/2002-12/msg00215.html (7,378 bytes)

3. [Amps] Neutral vs Ground Connection for 220 VAC (score: 1)
Author: (COLIN LAMB)
Date: Fri, 13 Dec 2002 9:7:39 -0800
exits strobe Over 60 years ago, W7VS was hired as director of the Communications of the City of Portland Police Department. As he surveyed the equipment, he inquired why there was a 6 inch fire gong
/archives//html/Amps/2002-12/msg00320.html (8,326 bytes)

4. [Amps] DC On tube filaments (score: 1)
Author: (COLIN LAMB)
Date: Wed, 9 Oct 2002 17:26:0 -0700
However, there is a difference. The equipment in a military aircraft is "expendable". No one plans on fighting a war that lasts more than a few years. Amateurs plan to keep their tube rigs for 5 deca
/archives//html/Amps/2002-10/msg00085.html (8,864 bytes)

5. [Amps] the life expectancy of a 3-1000z? (score: 1)
Author: (COLIN LAMB)
Date: Thu, 10 Oct 2002 6:23:50 -0700
What is the life expectancy of a 3-1000Z? 3-1000Z tubes last until death overtakes them. Smoking reduces their life expectancy as does hard partying. Long vacations and regular checkups may help. Reg
/archives//html/Amps/2002-10/msg00096.html (6,702 bytes)

6. [Amps] 4-400A Anode Voltage??? (score: 1)
Author: (COLIN LAMB)
Date: Mon, 21 Oct 2002 8:27:58 -0700
Jeffrey asked: "Audio amp experience tells me that headroom is very important and that a 500w amp sounds superior to a 100w amp operated at the same average listening level. I see this as due to it's
/archives//html/Amps/2002-10/msg00224.html (9,081 bytes)

7. [Amps] RE: 4CX800A Grounded Grid (score: 1)
Author: (COLIN LAMB)
Date: Wed, 23 Oct 2002 6:32:13 -0700
Hello Bill: The circuit will work only for tetrodes that have screens and control grids that can dissipate a large amount of power (many watts). Thus, the 4-400 and 4-1000 will work fine in grounded
/archives//html/Amps/2002-10/msg00240.html (7,784 bytes)

8. [Amps] Cooling those big finals (score: 1)
Author: (COLIN LAMB)
Date: Mon, 28 Oct 2002 6:15:15 -0800
Popular Science has an article on the ultra high speed scramjet. In order to develop it, however, they need a wind tunnel that produces a mach 6.0 wind. Standard compressors do not work. Some of this
/archives//html/Amps/2002-10/msg00292.html (6,691 bytes)

9. [Amps] virus? (score: 1)
Author: (COLIN LAMB)
Date: Fri, 4 Oct 2002 7:7:19 -0700
I switched to AVG about a year ago and like it a lot. I had McAfee and it worked, but after awhile I begin feeling like McAfee was a virus. They have numerous unwanted mailings to tout their programs
/archives//html/Amps/2002-10/msg00322.html (8,539 bytes)

10. [Amps] Heising Choke (score: 1)
Author: (COLIN LAMB)
Date: Tue, 17 Sep 2002 14:49:15 -0700
The Heising choke is perfect for using a parallel 815m driven by a 2A3, to AM modulate an HY-69. You can get up to 80% modulation as is. By placing a resistor (and bypass capacitor) in series with th
/archives//html/Amps/2002-09/msg00116.html (9,442 bytes)

11. [Amps] Gonset Amplifier (score: 1)
Author: (COLIN LAMB)
Date: Wed, 18 Sep 2002 14:27:32 -0700
The Gonset 500-W was made in 1954 and covered 10 - 80 meters with provision for 160. SSB output is 250 watts PEP. Am output is 90 Watts. CW output is 220 watts. Uses 4 x 807 tubes in parallel with 4
/archives//html/Amps/2002-09/msg00139.html (9,046 bytes)

12. [Amps] X-ray dangers from amplifiers? (score: 1)
Author: (COLIN LAMB)
Date: Mon, 30 Sep 2002 6:34:31 -0700
I think any normal film can be used for x-ray detection. Just cut off a piece of film and put it in a light proof envelope (black). Even a small envelope is fine. Attach to your shirt. For a good sta
/archives//html/Amps/2002-09/msg00280.html (10,855 bytes)

13. [Amps] RE: [701A Tube (score: 1)
Author: (COLIN LAMB)
Date: Mon, 23 Sep 2002 21:7:54 -0700
THe 701A tube is a WWII radar pulse tube. It has high interelectrode capacity which makes it less useful on 10 and 15 meters. In the 50's, it was sold surplus for $1.95. You will need to make your ow
/archives//html/Amps/2002-09/msg00286.html (7,754 bytes)

14. [Amps] Commander-II 144MHz amp PSU woes (and Tempo 2002A) (score: 1)
Author: (COLIN LAMB)
Date: Sun, 11 Aug 2002 19:18:25 -0700
Mike asked: "My question is, do the carbon composition resistors used in US made amps tend to go high resistance with age? I had a similar thing on a friends 2006, and the HT meter multiplier resisto
/archives//html/Amps/2002-08/msg00107.html (12,444 bytes)

15. [Amps] pictures (score: 1)
Author: (COLIN LAMB)
Date: Fri, 23 Aug 2002 5:34:14 -0700
If you are not in a hurry, you can take high resolution photographs with the old standard 35 mm SLR camera, using macro lenses and high quality interchangeable lenses. Then, when you have the film pr
/archives//html/Amps/2002-08/msg00212.html (8,085 bytes)

16. [Amps] bangs in 3cx800 (score: 1)
Author: (COLIN LAMB)
Date: Sun, 25 Aug 2002 1:47:28 -0700
"Except perhaps on the air? Rated third-order IMD of the ACOM 1000 is only -35 dB below rated output. I suspect real-world performance from this tetrode-based amp without a tuned input may be worse t
/archives//html/Amps/2002-08/msg00252.html (8,929 bytes)

17. [Amps] hENRY 2K-3 FAN NOISE (score: 1)
Author: (COLIN LAMB)
Date: Thu, 29 Aug 2002 17:51:33 -0700
Tube cooling fans are like aircraft engines. You always want one louder than the guy chasing you. And, when they become silent, you need to start thinking about qrp or qrt. 73, Colin K7FM To: <amps@c
/archives//html/Amps/2002-08/msg00328.html (8,805 bytes)

18. [Amps] 4-250A question (score: 1)
Author: (COLIN LAMB)
Date: Thu, 4 Jul 2002 6:54:14 -0700
Chris asked: "will it kill it right away. What is the max filament voltage any of you have put on this tube and made it last and preform to your satisfaction? thanks for any help you can give" There
/archives//html/Amps/2002-07/msg00059.html (8,762 bytes)

19. [Amps] 4-250A question (score: 1)
Author: (COLIN LAMB)
Date: Thu, 4 Jul 2002 11:44:26 -0700
"This reminds me of a homebrew amplifier I got some years ago. I replaced the missing parts and installed a good 3-500z only to find the output was very low. I assume that why the builder gave up on
/archives//html/Amps/2002-07/msg00063.html (8,177 bytes)

20. [Amps] Mica Capacitors (score: 1)
Author: (COLIN LAMB)
Date: Sun, 14 Jul 2002 6:51:29 -0700
Hello Guillermo: I have used the old WWII mica capacitors for many projects and they have all worked fine and never failed. I have never experienced the shorting problems that Rich mentioned with the
/archives//html/Amps/2002-07/msg00182.html (9,068 bytes)

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