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Total 10 documents matching your query.

1. [Amps] L4B biasing (score: 1): Author: mike via Amps <amps@contesting.com>; Date: Wed, 24 Dec 2014 15:52:42 -0500; I just finished me Drake power supply. I used a Drake transformer and a doubler board with 8 caps. I have 2600 volts showing on the high voltage meter. I have eliminated all the bias circuit in the p; /archives//html/Amps/2014-12/msg00096.html (6,692 bytes)
2. Re: [Amps] L4B biasing (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Wed, 24 Dec 2014 13:23:12 -0800; Yes you should add bias. I added 11 diodes in the center tap of the filament trany. So that would be about 7 volts. - Paul .At 12:52 PM 12/24/2014, you wrote: I just finished me Drake power supply. I; /archives//html/Amps/2014-12/msg00097.html (8,047 bytes)
3. Re: [Amps] L4B biasing (score: 1): Author: MU 4CX250B <4cx250b@miamioh.edu>; Date: Wed, 24 Dec 2014 14:30:58 -0700; Mike, it's hard to answer your question without knowing a few more details. Do you operate much CW, or mostly SSB? Also, have you thought about modifying the RF deck to use electronic T/R switching,; /archives//html/Amps/2014-12/msg00098.html (7,999 bytes)
4. Re: [Amps] L4B biasing (score: 1): Author: Vic Rosenthal <k2vco.vic@gmail.com>; Date: Thu, 25 Dec 2014 07:41:40 +0200; According to the 3-500z data sheet, this should be fine. The 200 ma seems a little low, but I guess it depends on the tubes. You should make sure that you can get rid of the heat. Vic K2VCO /4X6GP __; /archives//html/Amps/2014-12/msg00099.html (7,647 bytes)
5. Re: [Amps] L4B biasing (score: 1): Author: "Jim W7RY" <w7ry@centurytel.net>; Date: Wed, 24 Dec 2014 22:14:01 -0800; 11 diodes (7 volts) is way too much bias voltage. Better to have about 3 diodes (1N5408). That is what I have found while designing my QSK circuit board for the Drake. The L4 and L4B was designed wit; /archives//html/Amps/2014-12/msg00100.html (9,464 bytes)
6. Re: [Amps] L4B biasing (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Thu, 25 Dec 2014 10:28:54 -0500; If you are planning to use it as an AM linear at times running about 7-8V bias will be more efficient and not hurt SSB IMD. Ive been using my LK-500ZC that way for years and confirmed on a spectrum a; /archives//html/Amps/2014-12/msg00101.html (10,557 bytes)
7. Re: [Amps] L4B biasing (score: 1): Author: "Steven Grant, W4IIV via Amps" <amps@contesting.com>; Date: Thu, 25 Dec 2014 21:37:03 +0000 (UTC); A 3-500 amp does not need bias unless it is run at 3000 volts or above. 200 mills of idling current is normal for this amp I just finished me Drake power supply. I used a Drake transformer and a doub; /archives//html/Amps/2014-12/msg00102.html (8,282 bytes)
8. Re: [Amps] L4B biasing (score: 1): Author: "Carl" <km1h@jeremy.qozzy.com>; Date: Thu, 25 Dec 2014 17:04:33 -0500; You just might want to look at Eimac's spec sheet. http://frank.pocnet.net/sheets/140/3/3-500Z.pdf Carl KM1H A 3-500 amp does not need bias unless it is run at 3000 volts or above. 200 mills of idlin; /archives//html/Amps/2014-12/msg00103.html (9,281 bytes)
9. [Amps] L4B biasing (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Thu, 25 Dec 2014 15:36:47 -0800; 11 diodes (7 volts) is way too much bias voltage. Better to have about 3 diodes (1N5408). That is what I have found while designing my QSK circuit board for the Drake. The L4 and L4B was designed wit; /archives//html/Amps/2014-12/msg00104.html (9,735 bytes)
10. [Amps] L4B biasing (score: 1): Author: "Jim Thomson" <jim.thom@telus.net>; Date: Fri, 26 Dec 2014 00:03:10 -0800; Yes you should add bias. I added 11 diodes in the center tap of the filament trany. So that would be about 7 volts. - Paul contacts on the TR relay will eventually fry. With the contacts in mid air,; /archives//html/Amps/2014-12/msg00105.html (8,447 bytes)

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