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A “Sound Technology 1200A Test Panel” that needs attention.
I restored the power supply, Deoxed the pots and switches. Replaced the RCA jacks on the front and resecured all the BNC connectors on the back.
All the PS voltages are good.
I have the panel connected to the ST1700B and a ST1000A along with the Bench receiver.
At first the test panel was working well. I connected each ST Distortion analyzer, FM generator and the Oscilloscope, making sure the switching and functions worked through the panel.
I have a feeling the op amps are making it difficult to precisely check the functions. Sometimes the signal is there, other times its distorted.
Its the buffered signal that the ST1200 uses for all the test functions where a signal is needed in the test receiver/amp.
It has some of these OPA2605 and the OPA741’s there’s 14 or so op-amps total in this piece of equipment. I need to find some modern op amps to fit.
Here’s an attachment of the snip: test signal board:
All the PS voltages are good.
I have the panel connected to the ST1700B and a ST1000A along with the Bench receiver.
At first the test panel was working well. I connected each ST Distortion analyzer, FM generator and the Oscilloscope, making sure the switching and functions worked through the panel.
I have a feeling the op amps are making it difficult to precisely check the functions. Sometimes the signal is there, other times its distorted.
Its the buffered signal that the ST1200 uses for all the test functions where a signal is needed in the test receiver/amp.
It has some of these OPA2605 and the OPA741’s there’s 14 or so op-amps total in this piece of equipment. I need to find some modern op amps to fit.
Here’s an attachment of the snip: test signal board:
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