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I am not sure which opamps to change in my Technics SL-P990 cd player. Thomas helped me with choosing a suitable opamp, thanks again the OPA1642.
A japanese website M5238pf Mitsubishi made in I / V conversion" . from the service manual IC805,806,807, 808 are IC Buffer AMP M5238FP IC 809, 810 are IC Amplifer NJM5532 ( near adjustment screws) IC 811,812 are IC Filter NJM5532 IC 813, 814 are IC Amplifer M5238FP
I thought IC809 ,810 and IC81, IC814 as in the manual they are IC amplifer? which opamps do i need to change. Thanks in Advance
photo of opamp arrangement
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In reply to Sam Macdonald:
It is difficult to know where in this system its greatest performance limitations exist. Likely, the designers took each stage's design into careful consideration and attempted to optimize them for best performance. Therefore, possibly the only benefits from changing op amps might be reduced noise and/or distortion. As a rule an analog signal chain benefits most from placing the highest performance, low noise, low distortion amplifiers at the beginning of the chain where the signal levels are at their lowest levels. U13 and U14 are out the end of the chain and are connected as unity-gain buffers. Those stages may benefit somewhat if the OPA1642 has lower distortion than the original amplifiers, but is something that would have to be determined by measurement. It probably couldn't be detected by ear.
PA - linear Applications Engineering
In reply to Thomas Kuehl:
Indeed the sonic benefits would be those gained from the lower distortion and noise of the OPA1642. However, it then comes down to the ability of the listener's ability to detect the improvements.
PA - Linear Applications Engineering
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