Help with finding equivalent Operational Amplifier from AD converter

[ssyniu]

Hi guys I own old sampler I think one or more operational amplifiers are faulty so I want to replace them as the machine is very old I am looking for help with finding something that would fit instead of the old one.Would you be able please to tell me if I can get something equivalent and if possible if you could post a link to this chip where I can buy it it would be grate all the best.
Here is the picture of the first op amp :

https://ibb.co/zQCdrQy

Would this one work(Does the second number(9746C10) matters as it different from the original one(9427C01))???

https://www.ebay.co.uk/itm/323813750458

Or its not important as long as the first number(C812C) is correct???

Here is the second OpAmp:

https://ibb.co/jV1dqD2

Would this one work instead???

https://www.ebay.com/itm/203157810857?epid=20012035370&hash=item2f4d262ea9:g:xtEAAOSwzrxUtpN9

And finally the last one:

https://ibb.co/nRnqsZr

Would this one work instead:

https://www.ebay.co.uk/itm/192747654627?epid=2243666181&hash=item2ce0a7cde3:g:ykAAAOSwndZaYcYj

Thank You
All the best

 

[PETERDECO]

https://www.ebay.co.uk/itm/5PC-C812C-UPC812C-operational-amplifier-IC-/264735677249

 

[ssyniu]

Hi So u think this one will do intead the one ive posted or both.
Cuz you didnt comment nothing.
Please r leat me know

 

[PETERDECO]

I thought this was the original you are trying to replace.

 

[ssyniu]

Mabye u see i dont know thats why i am asking here does the codes on the replaced one needs to be exactly the same as on the original one?
I am asking about this code:9427C01???
Its a little bit different code compering to the original one?

 

[bertus]

Hello,

The C812C is the partnumber.
The other code is likely a production date/number.
That can vary for each batch produced.

Bertus

 

[ssyniu]

Oh grate i was wandering what the other code means.Need to place the order than.All the best

 

[Journey11]

As long as the pinouts are the same it should work ... if the part is not identical spec-wise you mat get a slightly different performance out of it. May or may not affect the sound ... the ear probably wouldn't hear it. If this is a vintage keyboard synth ... I have done a few of these and replacement parts are hard to get so have to sub something close with exact pinout out for pinout and supply voltages are good to go ... I find sometimes the sub part performs better because of better/newer technology in production and improved design.

 

[ssyniu]

As long as the pinouts are the same it should work ... if the part is not identical spec-wise you mat get a slightly different performance out of it. May or may not affect the sound ... the ear probably wouldn't hear it. If this is a vintage keyboard synth ... I have done a few of these and replacement parts are hard to get so have to sub something close with exact pinout out for pinout and supply voltages are good to go ... I find sometimes the sub part performs better because of better/newer technology in production and improved design.

Hey.I am glad you participate.I would really appreciate if you could check above in the main question if the parts i found would work in your opinion as a replacment to the original ones.Please I would appreciate. All the best