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 Post subject: Paco B-12 Power Supply
PostPosted: Oct Sat 17, 2009 1:28 pm 
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Joined: Sep Sat 29, 2007 2:35 pm
Posts: 316
Location: Festus, Missouri
Does anyone have any information on this power supply? I downloaded the schematic from bama. I need to know what the two calibration pots do and how to set them.
Thanks
Tex


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 Post subject:
PostPosted: Oct Sat 17, 2009 11:31 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 12344
Location: Albuquerque, NM 87123
Maybe I can help; I own a B12.

I believe the control marked R16 (zero calibration) is for setting the power supply output to actual zero volts when R18 (regulated output) is at minimum. It is possible for these supplies to output a negative voltage when the control is at minimum.
The other control (R19, 400 volt calibration) is used to limit the upper range to 400 volts. I think the raw power supply voltage is something like 525 volts, and you don't want the output to be over 400.


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 Post subject:
PostPosted: Oct Sun 18, 2009 12:15 am 
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Joined: Sep Sat 29, 2007 2:35 pm
Posts: 316
Location: Festus, Missouri
Thanks for the information Johnnysan. I kind of figured that. Maybe I can pick up a manual somewhere.


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 Post subject:
PostPosted: Nov Tue 17, 2009 2:50 am 
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Joined: Sep Sun 07, 2008 2:19 am
Posts: 226
I was just given one of these tonight by a member of the local ARC. It looks original under the chassis, so I'm sure it needs a re-cap job.

But at least it's decently clean. And since I like to homebrew, I'm sure I will get some use out of it after I have it up and going. I'm going to have to get a schematic and study it, I understand what the rectifier tubes do, and what the regulator tubes do, but why it has a pair of 6L6GC's I'm not so sure of.



Image

Image

Image


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 Post subject:
PostPosted: Nov Tue 17, 2009 3:12 am 
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Joined: Sep Sun 07, 2008 2:19 am
Posts: 226
Oh, the complete manual is also on bama:

http://bama.edebris.com/manuals/paco/b-12/

(there were two files, one was just the schematic, this one was the whole manual)


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 Post subject:
PostPosted: Nov Tue 17, 2009 5:42 am 
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Joined: Mar Sat 14, 2009 5:56 pm
Posts: 2553
Location: RI, 02885
I acquired a nice clean one last year from an estate and it works great. I primarily use it in rejuvenating NOS filter caps.

Pat


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 Post subject:
PostPosted: Nov Tue 17, 2009 6:40 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 12344
Location: Albuquerque, NM 87123
The 6L6 tubes are the are the outputs; they supply the B+ at 0 to 400 volts.
That's a nice supply; I used mine just last night.


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