PSU for Nagra IS

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t3h

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Joined
Jun 2, 2018
Messages
1
hei, I'm creating a PSU for old Nagra reel-to-reel recorder model IS. I don't have schematics for my nagra so I'm trying to make sense of the universal binder connector on the side of machine.
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https://photos.app.goo.gl/yGL3xEOsuvL6JosE2
I found some good advices from an older thread in this forum https://groupdiy.com/index.php?topic=47661.msg602273#msg602273   by user PRR but the wiring of IS looks somewhat different from 4.2. Based on what I see on box, I wold guess it uses negative Ground on pin 3. The binder connectors are labelled as:
1 SPEED CORRECTION
2 +6G
3 - (ground sign)
4 BATT. +
5 PILOT OUT
6 LINE INPUT
7

I'm not sure exactly about the positive pin but I would  guess it's the pin 4 with BATT + sign. Can anybody confirm this? Battery uses 12V DC so I would assume the same for the PSU. Would this be correct assumption? Thanks for the help.


 
Right on time .... The IS cannot be fed with external power. You will need it's original power supply, or the battery box, or the accumulator pack. The accumulator pack is the same on the DSM. and can be charged with either the DSM, or the IS power supply. (accumulator mounts on the IS power supply in order to charge it). The IS power supply mounts under the IS itself for external power usage
 
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