TDA0470D Farfisa Organ

[ilfungo]

Hi

I'm working on a Farfisa organ andI've found the problem is a bad IC Gate .

On the schematic is marched as a TDA 0470D but the real on the PCB is H629B1.

My Dubt is

different revision of schematic?

TDA0470D could be replaced with H629B1 and viceversa?



I can't find a datasheet of this old ic's...

Experinces?
Thanks!!!

 

[abbey road d enfer]

This marking looks very much like a manufacturing date or batch number.
The type marking has probably been erased.
https://www.donberg.fr/descript/t/tda_0470d.htm

 

[ilfungo]

H629B1

 

[Whoops]

Maybe they are interchangeable,
fortunately you can still buy both:

https://www.ebay.com/itm/202955495783

 

[ilfungo]

TDA0470D

 

[ilfungo]

Someone know these ic's ?
Thanks!