On 7/28/2020 6:48 PM, Carlos E Murillo-Sanchez via cctalk wrote:
So, what would two chips marked
U6A seems likely to me to be referring to a linear chip, rather than a
digital one, though the 6 between the mu (U) and the A is not something
I am familiar with. I also don't get any hits in the catalog looking
As a guess, it is might be a ua709 Operational amplifier.
730 might be uA730 - a differential amplifier.
Both were pretty common.