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 Post subject: Sansui 1000 power transformer
PostPosted: Aug Fri 10, 2018 11:31 pm 
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Joined: Aug Tue 07, 2018 4:59 am
Posts: 3
The power transformer has approximately 8 cables coming from each side, and I’m not sure how I’m supposed to pull and test it. Do I need to follow all ~15 cables and desolder or just clip them and pull it through? Assuming I clip them, I would just resolver the wires back together and heat shrink wrap them back together. Which method is preferred? Also don’t know which cords I’d need to run power to once I’ve pulled it out. Any help is greatly appreciated. Thanks!


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 Post subject: Re: Sansui 1000 power transformer
PostPosted: Aug Fri 10, 2018 11:45 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1466
Location: Cape Breton Island Canada
Seeing that you have the service manual wouldn't it be wise to leave it in place and take measurements with it attached..I'm not following the advantage of pulling the transformer?.Those voltages on the schematic are measured with it in place under load.

https://www.hifiengine.com/manual_libra ... 000a.shtml

https://www.hifiengine.com/manual_libra ... 1000.shtml


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 Post subject: Re: Sansui 1000 power transformer
PostPosted: Aug Sat 11, 2018 12:45 am 
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Joined: Aug Tue 07, 2018 4:59 am
Posts: 3
Thats actually a great point, didn’t see those in there. Thanks for the help


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 Post subject: Re: Sansui 1000 power transformer
PostPosted: Aug Sat 11, 2018 8:14 pm 
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Joined: Sep Thu 23, 2010 6:37 am
Posts: 11636
Location: Powell River BC Canada
Assuming this is the Sansui 1000 receiver, how do you power it up ? That
model will connect the power line to the chassis if one of the 25E5 tubes
shorts heater to cathode. Some runs were for domestic Japanese sale
use only and ran on 100 volts.

The 1000A was the model approved for North America. It used 7591 tubes
as output, with 6.3 volt heaters.

I was service manager for a Canadian Sansui distributor in Canada in the 60s
and was responsible for making sure products sold had appropriate labeling to
conform with bylaws .

The Sansui 1000 units repaired were mainly personal effects from overseas
military people who bought them in Germany or Viet Nam.
Attachment:
Sansui 1000 primary.JPG
Sansui 1000 primary.JPG [ 24.6 KiB | Viewed 836 times ]

_________________
de
VE7ASO VE7ZSO
Amateur Radio Literacy Club. May we help you read better.
Steve Dow
ve7aso@rac.ca


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 Post subject: Re: Sansui 1000 power transformer
PostPosted: Aug Tue 14, 2018 3:23 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 5296
Location: Rochester NY USA
If I had one, I'd only run it on a GFI outlet or install a 3-wire cord. And I always ensure that there's no leakage to chassis before I plug in any vintage unit. Insulation resistance resistance test is ideal, but an ohmmeter will find gross faults.

Plug it in with a 100W light bulb in series, tubes removed. If the bulb lights bright, transformer (or rectifier, or filter capacitor) is shorted.

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 Post subject: Re: Sansui 1000 power transformer
PostPosted: Aug Wed 15, 2018 10:48 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 10715
Location: Baguio City, Philippines
All discussions should be kept in one topic.

viewtopic.php?f=13&t=344562


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