Best LDR for Sound Technology ST 17xx gear - diyAudio
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Old 18th June 2010, 05:24 PM   #1
jblmar is offline jblmar  United States
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Join Date: Dec 2005
Location: Brooklyn, New York
Default Best LDR for Sound Technology ST 17xx gear

Since there is little mentioned on the 'net re Sound Technology gear, perhaps it would be a good idea for those who have successfully repaired their gear to list the LDRs used along with any mods they have made to the circuit(s). Both in the Oscillator & Analyzer sections.
As a folllow up, they can comment on their findings. In addition, it would be helpful to establish a listing of results using different LDRs in different locations on the analyzer board.


The 17xx models share similar LDR circuits.

Last edited by jblmar; 18th June 2010 at 05:32 PM.
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Old 27th June 2010, 11:23 PM   #2
1audio is offline 1audio  United States
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Location: SF Bay Area
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Default LDR sources

This is copied from another reply by me. I'm adding it here so I can find it myself later:
When it switches from fast to low distortion it engages the LDR. Those are the real weak point in the analyzer (aside from the many switches). ST didn't reveal the actual part number. The original vendor doesn't exist. Vactec does : Welcome | PerkinElmer so if we can figure out which part it was we can cross check- Silonex Inc.: Products: Audiohm Optocouplers . My schematic shows a CL614m note next to the part. That seems to lead to a black hole. I have a very foggy memory of 200 Ohms on resistance. The coupler has a 10K parallel resistance so that may be a real target value. I believe a VTL5C10 will work as a replacement so the Audiohm NSL-32B-101 might be a good replacement.
Demian Martin
Product Design Services
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Old 1st July 2010, 02:10 PM   #3
jblmar is offline jblmar  United States
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The Silonex NSL-32 seems to be a good starting point.
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