Wanted Schematics for Sound Technology 1200A Test Panel - diyAudio
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Old 30th October 2015, 04:43 AM   #1
1audio is offline 1audio  United States
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Default Wanted Schematics for Sound Technology 1200A Test Panel

I have one and the operation part of the manual but the vendor I got it from routinely would copy the manual and leave out the schematics. I would like to get a good idea of the internal circuitry and flow. Reverse engineering is my last resort.
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Old 30th October 2015, 06:41 AM   #2
Enzo is offline Enzo  United States
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I have the manual for the companion 1700A/B, and may have the manual for the 1200, I will look when I get to the shop.

For the convenience of others joining in:
http://www.cieri.net/Documenti/Misur...A%20(1978).pdf

I always found the 1200 to be intuitive.
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Old 31st October 2015, 05:25 PM   #3
1audio is offline 1audio  United States
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The 1200 is pretty straightforward but I want to tweak the filters and make some other small changes. Thanks in advance if you are successful.

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Old 31st October 2015, 07:11 PM   #4
Enzo is offline Enzo  United States
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I found my books, the 1200 is not schematicized in them. (Is that a word?) The instructions on how to use it and configure it are there, but no innards. sorry.
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Old 31st October 2015, 07:49 PM   #5
1audio is offline 1audio  United States
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Thanks. That is the same version I have. Unusual for ST to not include service info.

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Old 13th July 2016, 12:07 AM   #6
1audio is offline 1audio  United States
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I now have the schematics for the 1200 test panel. I just got them scanned (smart trick- Staples scanned them all oversize, for $2 a sheet. Kinkos wanted $1.25 per square foot).

There are some interesting elements like the filter circuits and some of the other signal routing and grounding. Worth a look if you want to build something similar.

Contact me if you need a copy.
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Old 16th August 2016, 07:57 PM   #7
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I just found a 1200A and would like to get a copy of the operations manual and schematics. I'm quite happy to pay for it.
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Old 18th August 2016, 04:32 AM   #8
1audio is offline 1audio  United States
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PM me with your e-mail and I'll send it. I'm asking for a small ($5.00) contribution to cover the scanning. These were D size and larger pencil originals and not cheap to get scanned.

I have mine up and running. The features all work. The electronics are not as clean as I would like and I do want to upgrade the opamps and the sad RCA connectors on the front panel. The opamps are all in TO99 cans. Adapters are needed, which can be found on eBay. The LME49720 in TO99 cans is an alternative but way too expensive for this application.
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