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#1
Posted to rec.audio.pro
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Conn St-11 Strobe Tuner Calibration Mode Failure
I have an ST-11 that recently stopped calibrating correctly. When
switched into CAL mode the calibration knob has to be turned about 50 cents flat to indicate good calibration. In NORMAL (tuning) mode however an "E" from a tone generator shows as about 50 cents sharp until the calibration pot is turned back to the zero position. So it seems to be working fine except that the calibration function is now off by 50 cents. Has anyone else seem this sort of failure before? |
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#2
Posted to rec.audio.pro
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Conn St-11 Strobe Tuner Calibration Mode Failure
apa wrote:
I have an ST-11 that recently stopped calibrating correctly. When switched into CAL mode the calibration knob has to be turned about 50 cents flat to indicate good calibration. In NORMAL (tuning) mode however an "E" from a tone generator shows as about 50 cents sharp until the calibration pot is turned back to the zero position. So it seems to be working fine except that the calibration function is now off by 50 cents. Has anyone else seem this sort of failure before? Does this have a crystal control, or is it locked to the AC line like the original strobotuners? If it's like the original ones, I'd check the motor bearings and see if they are gummed up. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
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#3
Posted to rec.audio.pro
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Conn St-11 Strobe Tuner Calibration Mode Failure
I'm not sure which. I'll look around for a schematic.
If it was the motor bearings, wouldn't that screw up the regular tuning too, not just the CAL? Scott Dorsey wrote: apa wrote: I have an ST-11 that recently stopped calibrating correctly. When switched into CAL mode the calibration knob has to be turned about 50 cents flat to indicate good calibration. In NORMAL (tuning) mode however an "E" from a tone generator shows as about 50 cents sharp until the calibration pot is turned back to the zero position. So it seems to be working fine except that the calibration function is now off by 50 cents. Has anyone else seem this sort of failure before? Does this have a crystal control, or is it locked to the AC line like the original strobotuners? If it's like the original ones, I'd check the motor bearings and see if they are gummed up. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
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