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Total 19 documents matching your query.

1. [TenTec] bringing up an old amp (score: 1): Author: Clark Savage Turner <csturner@kcbx.net>; Date: Fri, 12 Oct 2007 15:23:29 -0700; Anyone have a quick link or a reference to the right way to bring up an old amp power supply? I have a variac for both 120 and 220, and I got an old friend's Drake L4B, not used for at least 10 years; /archives//html/TenTec/2007-10/msg00253.html (7,778 bytes)
2. Re: [TenTec] bringing up an old amp (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Fri, 12 Oct 2007 16:45:40 -0600; In theory bring it up slowly current limited to reform the capacitors. But in my experience more have failed immediately than I've successfully reformed. New electrolytics are more sure to work. More; /archives//html/TenTec/2007-10/msg00255.html (8,077 bytes)
3. Re: [TenTec] bringing up an old amp (score: 1): Author: Ken Brown <ken.d.brown@hawaiiantel.net>; Date: Fri, 12 Oct 2007 12:56:45 -1000; Not used for at least 10 years, and the capacitors are certainly a lot older than that. When you compare the cost and labor of buying new ones and putting them in first, versus the cost and labor of; /archives//html/TenTec/2007-10/msg00256.html (9,368 bytes)
4. Re: [TenTec] bringing up an old amp (score: 1): Author: Steve Berg <wa9jml@tbc.net>; Date: Fri, 12 Oct 2007 18:10:12 -0500; I would just get the new capacitors. I once hooked up an old Johnson Thunderbolt and tried to get it to power up. I let everything percolate for a while and then fired up the high voltage. I wound up; /archives//html/TenTec/2007-10/msg00257.html (10,194 bytes)
5. Re: [TenTec] bringing up an old amp (score: 1): Author: "Stuart Rohre" <rohre@arlut.utexas.edu>; Date: Fri, 12 Oct 2007 18:20:21 -0500; There are some reforming capacitors instructions on the web. You apply a fraction of the voltage for a few minutes, then ramp up another fraction, and so on. You might even measure the capacitor leak; /archives//html/TenTec/2007-10/msg00258.html (8,961 bytes)
6. Re: [TenTec] bringing up an old amp (score: 1): Author: Clark Savage Turner <csturner@kcbx.net>; Date: Fri, 12 Oct 2007 16:53:44 -0700; Heck, that all sounds right to me. I'll go to the schematic and check the values of the caps and see who has them for what price. The amp looks just fine, all is clean and switches look like they've; /archives//html/TenTec/2007-10/msg00259.html (8,905 bytes)
7. Re: [TenTec] bringing up an old amp (score: 1): Author: "Bob McGraw - K4TAX" <RMcGraw@Blomand.net>; Date: Fri, 12 Oct 2007 20:56:04 -0500; Start with the Variac at zero, be sure the amp is set for 240 volt primary and use the 240 Variac. Turn on the amp and bring the voltage on the Variac up 20 volts per hour. That will take 12 hours to; /archives//html/TenTec/2007-10/msg00260.html (9,413 bytes)
8. Re: [TenTec] bringing up an old amp (score: 1): Author: "Chuck & Vicki Tifft" <cftifft@sbcglobal.net>; Date: Fri, 12 Oct 2007 20:51:42 -0700; That is an good procedure, except I would remove the tube(s) first. Many tube types could be damaged from lack of sufficient cooling at reduced line voltages. Many tube types can generate a lot of he; /archives//html/TenTec/2007-10/msg00262.html (11,206 bytes)
9. Re: [TenTec] bringing up an old amp (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Fri, 12 Oct 2007 22:16:27 -0600; Tubs that have not been run in year, need more like 24 hours of filament or heater alone to warm up the getter deposit and to outgas the heater and cathode or filament. Two days doesn't hurt. 73, Jer; /archives//html/TenTec/2007-10/msg00263.html (9,550 bytes)
10. Re: [TenTec] bringing up an old amp (score: 1): Author: "Gary Hoffman" <ghoffman@spacetech.com>; Date: Sat, 13 Oct 2007 00:34:51 -0400; How does one leave the HV off the tubes ? Do you mean to go in and disconnect an HV lead or leads ? Or do you mean to turn on the power and not apply any drive for a long time ? It would seem awkward; /archives//html/TenTec/2007-10/msg00264.html (10,678 bytes)
11. Re: [TenTec] bringing up an old amp (score: 1): Author: "Stuart Rohre" <rohre@arlut.utexas.edu>; Date: Fri, 12 Oct 2007 23:39:29 -0500; Gary, Most amplifiers have a "power" switch that brings up the filaments, and a separate "standby-operate" switch that brings up the B plus to the plates of the finals. You leave the plate voltage sw; /archives//html/TenTec/2007-10/msg00265.html (8,669 bytes)
12. Re: [TenTec] bringing up an old amp (score: 1): Author: "Gary Hoffman" <ghoffman@spacetech.com>; Date: Sat, 13 Oct 2007 01:14:50 -0400; Stuart, Yes, I've seen those switches. But neither of my two amps are so equipped. But I understand that what is meant is truly disconnecting the HV. That's the point I guess. Gary -- Original Messag; /archives//html/TenTec/2007-10/msg00266.html (10,028 bytes)
13. Re: [TenTec] bringing up an old amp (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Fri, 12 Oct 2007 23:00:09 -0600; The getter is always active, its a reactive metal, on purpose. It does get warmed above room temperature in most power tubes after hours of heater or filament operation and if there are gas molecules; /archives//html/TenTec/2007-10/msg00267.html (10,173 bytes)
14. Re: [TenTec] bringing up an old amp (score: 1): Author: "Chuck & Vicki Tifft" <cftifft@sbcglobal.net>; Date: Fri, 12 Oct 2007 22:39:38 -0700; If your Amp doesn't have a HV on/off switch.(most standby switches only disable the keying line) then leave the Anode lead(s) disconnected when you reinstall the tube(s).You can most likely run the a; /archives//html/TenTec/2007-10/msg00268.html (10,308 bytes)
15. Re: [TenTec] bringing up an old amp (score: 1): Author: "Stuart Rohre" <rohre@arlut.utexas.edu>; Date: Sat, 13 Oct 2007 01:13:49 -0500; Remember also, some amplifiers have an interlock switch so you can't run with cover off. There are ways to handle that, but if you need to know that, please email privately. k5kvh@arrl.net Remember t; /archives//html/TenTec/2007-10/msg00269.html (8,931 bytes)
16. [TenTec] bringing up an old amp (score: 1): Author: "John K Gotwals" <john@gotwals.com>; Date: Sat, 13 Oct 2007 11:00:38 -0400; I purchased a new Drake L-4B in 1975 and put it into storage in 1990. In 2005 I got back on the HF bands and wanted to use the L-4B. Don't take the chance on old electrolytics. I rebuilt the HV capac; /archives//html/TenTec/2007-10/msg00281.html (9,283 bytes)
17. Re: [TenTec] bringing up an old amp (score: 1): Author: Ken Brown <ken.d.brown@hawaiiantel.net>; Date: Sat, 13 Oct 2007 08:04:44 -1000; Many ham amplifiers do not have a way to turn on the filament supply without turning on the HV. Is there a separate filament transformer? Or is there only one transformer that has both a HV secondar; /archives//html/TenTec/2007-10/msg00285.html (10,620 bytes)
18. Re: [TenTec] bringing up an old amp (score: 1): Author: Kevin Purcell <kevinpurcell@pobox.com>; Date: Sat, 13 Oct 2007 12:25:22 -0700; Personally I prefer the style of HV warning sign on an X-ray system I once saw in a lab. The power supply could provide something in the region of 10kV at 0.5A. The warning on the outside said: "Cont; /archives//html/TenTec/2007-10/msg00288.html (10,080 bytes)
19. Re: [TenTec] bringing up an old amp (score: 1): Author: "Rob Atkinson" <ranchorobbo@gmail.com>; Date: Mon, 15 Oct 2007 18:28:09 -0500; when you get 3-500s from rf parts they tell you to let them idle with the filaments on for 12 hours before any transmitting. Clark, you mentioned L4B chimneys--not sure if you are looking for them or; /archives//html/TenTec/2007-10/msg00328.html (8,275 bytes)

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