Unless they covered everything else up it's just the OP-Amp that's on PCB Traces. But i don't know how they did it.
Or maybe it's just a PCB, like you said. :D Still handwired though. 🤷♀️
I think i would like to have a 1960BV (for a little extra grind) and one of the older 1960BC (to be able to turn up the Amp more) as well.
But i would end up comparing them all the time and trying to find a favorite.