I have a Technics SL-P990 CD player with a few opamps. The service manual mentions the operational amplifers, though a Japanese website said the opamps were "Op-amp "M5238FP" Mitsubishi made in I / V conversion" . Which would be most suited to replace this opamp and which should I change?
I have some LM4562 smds spare, but there could be some better ones suited to the above opamp
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
TI does have a line of precision audio op amps specified for high-performance audio applications. Likely, there are some that will provide a higher level of performance than you may be receiving from the original op amps. Since I don't know what you are specifically after in terms of better ones, I think that you may be best qualified to review the amplifiers and make a selection. I am providing you with a link to our webpage that has the audio op amp selection guide:
I hope this is useful to you.
PA - Linear Applications Engineering
In reply to Thomas Kuehl:
Hi Thomas Thank you for your reply and links. I was able to find a pdf on the orginal op amps. they are j-fet. They op amps are in IV conversion whatever that means. Maybe another TI JFET would be good, like the OPA2604 or whatever suits the IV conversion and orignal pdf1.alldatasheet.com/.../M5238FP.html Thank you Regards Sam
In reply to Sam Macdonald:
The OPA2604 is an earlier generation TI/ Burr-Brown audio operational amplifier. Some of our newer amplifiers will probably provide higher performance; lower noise, lower distortion. Take a look at the OPA1642 and OPA1652 JFET audio op amps. They might be a good choice:
Great project... I did the same thing to my SL-P999. Do you have an original remote for the 990? If so, Is it a EUR64729? If it is, is there any chance of getting you to download the hex codes from the remote so they can be converted and loaded into a universal remote? You can contact me directly at: firstname.lastname@example.org.
Thanks in advance... good luck with the project!
PS... I might also suggest that you replace PCM56P DAC's with BurrBrown PCM61P's. Drop in replacement. More airy and better soundstage and a bit quieter.
In reply to David Sherfy:
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