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References: [ +from:Douglas.R.Snowden@noaa.gov: 24 ]

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1. [Amps] Good Way To Test A Plate Transformer ? (score: 1): Author: Douglas.R.Snowden@noaa.gov (Douglas R Snowden); Date: Fri, 25 Oct 2002 08:44:27 -0400; I have a Dentron MLA2500 that has burped. It appears that the transformer is bad. If I attach the electrolytic capacitors and diode bank to the transformer it will pop the fuse. If I disconnect all f; /archives//html/Amps/2002-10/msg00263.html (7,180 bytes)
2. [Amps] MLA2500 Multimeter Type? (score: 1): Author: Douglas.R.Snowden@noaa.gov (Douglas R Snowden); Date: Tue, 29 Oct 2002 17:09:44 -0800; The multimeter in my MLA2500 is blown. I think I will replace it with another and replace the power meter with a dedicated grid current meter. Anybody know what was in there originally? 1MA ? By the; /archives//html/Amps/2002-10/msg00307.html (6,649 bytes)
3. [Amps] Bias Zener Diodes In Parallel ? (score: 1): Author: Douglas.R.Snowden@noaa.gov (Douglas R Snowden); Date: Tue, 16 Jul 2002 13:29:12 -0400; I have an amp that I have put several 5.6Volt @ 5watt zeners in series for cathode bias. They get way too hot with about 800ma of current. Can I parallel zeners to divide the current without problems; /archives//html/Amps/2002-07/msg00219.html (7,580 bytes)
4. [Amps] Bias Zener Diodes In Parallel ? (score: 1): Author: Douglas.R.Snowden@noaa.gov (Douglas R Snowden); Date: Tue, 16 Jul 2002 15:45:42 -0400; That is what I was sort of thinking would happen. Most of the responses to my question are useful, but as usual you can't post to this list without someone calling you stupid. Gee- at least I am doin; /archives//html/Amps/2002-07/msg00229.html (10,089 bytes)
5. [Amps] Does a Russian GI7B like horizontal mount?` (score: 1): Author: Douglas.R.Snowden@noaa.gov (Douglas R Snowden); Date: Mon, 08 Apr 2002 11:42:20 -0400; Subject says it. I would like to mount a pair of these in the horizontal position. Think it's OK ? Doug N4IJ -- StripMime Report -- processed MIME parts -- multipart/mixed text/plain (text body -- ke; /archives//html/Amps/2002-04/msg00237.html (6,783 bytes)
6. [Amps] Amps that are GI7B candidates ? (score: 1): Author: Douglas.R.Snowden@noaa.gov (Douglas R Snowden); Date: Fri, 22 Mar 2002 11:26:51 -0500; I have a few of the Russian GI7B triodes here, and am wondering which of the cheaper amps are candidates for a mod. to use these ? Doug, N4IJ -- StripMime Report -- processed MIME parts -- multipart/; /archives//html/Amps/2002-03/msg00502.html (6,939 bytes)
7. [Amps] Input Impedance Question? (score: 1): Author: Douglas.R.Snowden@noaa.gov (Douglas R Snowden); Date: Thu, 28 Mar 2002 13:57:36 -0500; I expect to see with a pair of Russian GI7B's in GG? I expect I would tune the input anyway. Also, I saw a bias circuit using a transistor and some zeners in the base circuit. Is this so you can use; /archives//html/Amps/2002-03/msg00668.html (6,611 bytes)
8. [AMPS] GI7B Bias requirements (and methods) (score: 1): Author: Douglas.R.Snowden@noaa.gov (Douglas R Snowden); Date: Fri, 08 Feb 2002 08:27:51 -0500; This is a multi-part message in MIME format. --D58C6695EBAA9A9A3A5CDB95 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit I am in the early stage of building a pair of Russia; /archives//html/Amps/2002-02/msg00071.html (7,874 bytes)
9. [AMPS] High filament voltage etc (score: 1): Author: Douglas.R.Snowden@noaa.gov (Douglas R Snowden); Date: Mon, 03 Dec 2001 15:36:19 -0500; I have an amp that runs a single 4CX800. Knowing various ways to limit the filament voltage, I haven't bothered to do it yet. It runs about 12.9 volts. My question is, how does this come into play re; /archives//html/Amps/2001-12/msg00035.html (7,089 bytes)
10. [AMPS] Gi7B Tube Amps (score: 1): Author: Douglas.R.Snowden@noaa.gov (Douglas R Snowden); Date: Thu, 15 Nov 2001 14:53:08 -0500; How does the original heatsink come off? Glue? Screws? Doug N4IJ -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.co; /archives//html/Amps/2001-11/msg00264.html (9,833 bytes)
11. [AMPS] 4CX800 Idle Current a bit high (score: 1): Author: Douglas.R.Snowden@noaa.gov (Douglas R Snowden); Date: Wed, 31 Oct 2001 08:50:54 -0500; I have a 4cx800 that has 350volts screen voltage, -56volts grid bias and 2200volts plate voltage. The specs say it should idle at 150ma. It idles at 200ma. My question is: What is the preferred volta; /archives//html/Amps/2001-10/msg00505.html (7,175 bytes)
12. [AMPS] 4CX800 Filament Voltage ? (score: 1): Author: Douglas.R.Snowden@noaa.gov (Douglas R Snowden); Date: Thu, 16 Aug 2001 09:47:43 -0400; I am just about finsihed with my Dentron MLA2500 conversion to a 4CX800. I notice that with the tube plugged in I am putting about 13.1 volts on the filament from a transformer I have bolted to the r; /archives//html/Amps/2001-08/msg00154.html (7,117 bytes)
13. [AMPS] More MLA2500 conversion questions (score: 1): Author: Douglas.R.Snowden@noaa.gov (Douglas Snowden); Date: Tue, 01 May 2001 10:36:34 -0400; OK, I am on my way to putting a 4CX800 in my MLA2500 (against some advice) and would like to know if anyone has played around with putting two muffin fans in series to add to the air flow to the tube; /archives//html/Amps/2001-05/msg00009.html (7,503 bytes)
14. [AMPS] MLA2500 and screen voltage for 4CX800. (score: 1): Author: Douglas.R.Snowden@noaa.gov (Douglas Snowden); Date: Tue, 10 Apr 2001 08:31:01 -0400; I have decided to put a 4CX800 in the MLA2500 sitting on the bench. I don't have a copy othe old QST (96?) article on doing this, but I remember seeing that they used some sort of regulator board to; /archives//html/Amps/2001-04/msg00228.html (8,302 bytes)
15. [AMPS] MLA2500 and screen voltage for 4CX800. (score: 1): Author: Douglas.R.Snowden@noaa.gov (Douglas Snowden); Date: Tue, 10 Apr 2001 10:25:15 -0400; OK Conrad - thanks for the feedback. I read what you just said, but I don't understand why the screen would have a problem. I vaguely remember seeing something like this on a web site. Was it the mea; /archives//html/Amps/2001-04/msg00230.html (11,344 bytes)
16. [AMPS] MLA2500 and screen voltage for 4CX800. (score: 1): Author: Douglas.R.Snowden@noaa.gov (Douglas Snowden); Date: Wed, 11 Apr 2001 07:57:19 -0400; I remember now why I first mentioned the zener diode string method. I used the idea from measures web page on a pair of 4CX250's on HF. It worked fine, although I never did any measurements for regul; /archives//html/Amps/2001-04/msg00247.html (13,095 bytes)
17. [AMPS] 4CX800 Chimney - how to make ? (score: 1): Author: Douglas.R.Snowden@noaa.gov (Douglas Snowden); Date: Tue, 17 Apr 2001 08:36:37 -0400; I am looking for something to use in making a chimney for a 4CX800. Any ideas? I thought of the expensive way (teflon) but don't know where to get teflon. Also thought of the old Alpha method of wrap; /archives//html/Amps/2001-04/msg00388.html (7,270 bytes)
18. [AMPS] Dentron MLA2500 Modification (score: 1): Author: Douglas.R.Snowden@noaa.gov (Douglas Snowden); Date: Fri, 23 Mar 2001 16:17:35 -0500; I'm sure this has been hashed over many times, but I just bought an MLA2500 without tubes. Now I need to decide the best route to go in modifying it for modern tubes. Any references other than the Sv; /archives//html/Amps/2001-03/msg00225.html (6,790 bytes)
19. [AMPS] Amp knob source? (score: 1): Author: Douglas.R.Snowden@noaa.gov (Douglas Snowden); Date: Wed, 21 Feb 2001 13:19:21 -0500; I am homebrewing a linear and as always don't have knobs that match for it. Where does one find these now days, beside a hamfest? They need to be decent size (plate tuning, loading bandswitch, etc) D; /archives//html/Amps/2001-02/msg00292.html (6,626 bytes)
20. [AMPS] Cinch Jones Plugs for amplifier interconnect (score: 1): Author: Douglas.R.Snowden@noaa.gov (Douglas Snowden); Date: Wed, 28 Feb 2001 08:16:09 -0500; I ordered a couple of male and female 12 pin Cinch Jones connectors from Mouser but they returned my money saying that those connectors have been discontinued. Does anyone have, or know where I can g; /archives//html/Amps/2001-02/msg00371.html (7,201 bytes)

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