Scott 490 Amp - Phono Problem

[pakko]

Hello everybody,
I got a pretty rare Scott 490 Amp from the beginning 70´s. It´s working fine on the HF inputs but does have a problem with the phono section. No sound at all!
I already reaped the phono board with no result. It contains a unknown IC and I need an advice what this could be. I added some pictures - maybe someone can help me to identify this chip.
Thanks.

 

[repair_guy]

Looks like a could be a early quad op-amp ic, or a custom built amplifier ic. Might be hard to get one since it's an early ic. Did you check if there's voltage going to that ic? Also, those two black components next to the ic, what's the numbers on those?

 

[pakko]

Thank you.
It can´t be this?
http://www.radiomuseum.org/tubes/tube_lc7215.html

 

[repair_guy]

Thank you.
It can´t be this?
http://www.radiomuseum.org/tubes/tube_lc7215.html

No, 7215 is the date code. 15th week of 1972. The part number is 4-005 and the brand looks to Fairchild. It's some kind of outdated number system they used on early ICs.