Opportunity to Purchase Sony DAS-703-ES DAC

I currently have a respectable analog system.  Primaluna Dialouge amp, VPI Classic Signature Turntable with a fatboy tone arm, Soundsmith Paua MK, cartridge and Focal Aria 396 floor-standing. speakers. I love the enjoyment my analog provides me!

As far as my digital is concerned, it's probably lacking.  I stream HQ Deezer from my phone to a $200 Audioengine bluetooth enabled DAC.  With that said, my current digital system is very low end for it can't hold a candle to my analog system. I'm ok with that for I don't listen to digital all that much, at least for now.

I have the opportunity to purchase a vintage circa 1985 Sony - 703 ES DAC for $175.  Is this much of an upgrade from the DAC I'm currently using.  At $175, the cost is a moot, I just don't want to waste my time if it isn't a substantial upgrade.

Does anyone out there know anything about this Sony DAC.  I've read some reviews of this DAC and it seemed to be a nice piece of equipment back in the day!  Thank you.