Conn ST-11 Strobotuner Mod Help - Page 3 - diyAudio
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Old 24th September 2012, 10:02 PM   #21
Enzo is offline Enzo  United States
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Join Date: Sep 2004
Location: Lansing, Michigan
The clock only needs to be stable on a short term basis. Every time you use the unit, you start by calibrating it to the mains frequency. There is a setting on the front panel just for that. And by the time it is divided down for the motors, a few hertz drift would not be noticed. SO unlike some video source that must sync up to the world, they could get away with a "poorly designed" clock. These little units worked quite well.
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Old 24th September 2012, 10:21 PM   #22
labjr is offline labjr  United States
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Join Date: Apr 2003
Location: MA
The units did work well. I still have several of them. Would be nice though if they had a position on the frequency adjust dial that said "locked" or something like that so one could use it for concert pitch only and not have to fuss with calibrating at all.
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Old 23rd February 2014, 08:28 AM   #23
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Join Date: Feb 2014
I have CONN Strobotuner ST-11, and today its motor stopped spinning (lights & pilot LED are on and +50V of motor power transistors is OK, though voltage to the motor is only 1.4 volt). Do you have some troubleshooting documents, or any suggestions?

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