I am adding further details with part of the schematic for the P477A. I dont think the LM833N are the ones to change, but the BAs.
Why do want to replace the BA4560? Is it damage? What is the problem?
I checked the AD8599, spec-wise, it is a good replacement. However, this amplifier is not rail to rail output. it needs around 1.3V output headroom.
If I read the schematic correctly, the supply voltage is 7.3V and expected output is 6.1 Vpp. Though I am not sure if the 6.1 V is referring to the output of each amplifier or is it differential output voltage of the two amplifier? Please double check if the AD8599 output range is sufficient on your circuit.
Or you can also check the AD4084-2, it is a rail to rail input/output amplifier with almost the same specs with the BA4560.
Thanks and best regards,
Thank you for the reply and help. The AD8599 it would need a certain amount of voltage. I did up a Philips CD753 with the AD8599 - beautiful sounding opamp. I think my friend who helped me said it needed 10v
I want to upgrade to better opamps as a improvement to sound. The BA4560 have higher noise etc. The AD4084 would be an improvement and be more likely to be compatiable with the set up of the CD player? I am very sure about the 6.1v. The whole service manual is too large 7.6mb.
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