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Old 18th March 2013, 06:10 PM   #1
fitchpe is offline fitchpe  United States
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Default Sound Technology 1710A

My Sound Technology 1710A Audio Measurement System unit has developed a vacillating distortion which apparently is in the master oscillator.
The unit specification for generator output THD is below 0.04% … very clean. Just recently it has jumper up to around 0.15%.
Has anyone seen this problem ??
This unit uses a notable number of 2605 op amp ICs which appear to be super 741s in a TO-22 8 pin can with the can coming to pin 8 for grounding purposes. Any information on this unique IC would be appreciated.

Thank you.
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Old 18th March 2013, 09:44 PM   #2
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Old 18th March 2013, 10:13 PM   #3
fitchpe is offline fitchpe  United States
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Thank you so much for the lead ... this IC, at least from the data sheet pin-out, looks about like the device that's in there.
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Old 19th March 2013, 09:46 AM   #4
Elvee is offline Elvee  Belgium
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I own a 1700B, which should be quite similar.

I have had a number of problems along the years, here they are in as much as I can recall them:
-Faulty 723 in the supply section; unrelated to your problem
-Bad contacts in the connectors, the flying leads going to TP's on the boards; possible culprit
-Faulty optocoupler; idem
-Noisy and out of tolerance carb comp resistor; idem
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