Unfortunately those chips are no longer produced and difficult to find. There should be a way to make a replacement for it using modern surface mount devices but I haven't found any yet.

In my old notes, I have mentioned AD7512DI(JN) as a replacement.
My old notes are handwritten and no serialnumbers are noted for this entry, so I cannot tell if I used it in an actual repair.
But I have some of the ICs in the drawer, suggesting that I have probably used it at some point, and I'm pretty sure that I would have removed the entry
from my notes if it didn't work.
In other words, consider this unconfirmed information, - worth a test, I suppose.

Martin

Martin, yes that looks like a valid replacement. The datasheet for the AD7812DI(JN) match the AD10/192 in the Beomaster 8000 schematic. The AD7812DI(JN) is also obsolete though. However, I do see quite a few for sale (mostly from China) on Ebay.

Do you have any notes regarding the AD10/278 ?

sonavor wrote:

Do you have any notes regarding the AD10/278 ?

Sadly, no. - But I can't help thinking, that something involving a CMOS 4066 could be made to work.

Looking around for info about the AD7512, I just came across this thread, where you actually mention the IC yourself... ❓
/forum/imported-unmapped/beomaster-8000-tuner-sound-in-only-one-channel#post-2201483
Err.. are we getting old? 😂 

Martin 

I know I am getting old. That isn't the first time I posted an answer and forgot about it. I guess posting and search engines are the new way to take notes :-).

I found  the AD7512DI  chip and should receive it this week will keep you posted on how it works out. Gee's I can't wait to hear the 8000 in action. Thanks to everyone who responded to my request.

Stephen

That's good news. Yes, please report back on the results.

Stephen, how 's that 8000 doing?

Steven