I have 1801b's, built by Dave Ellis, although I hear wonderful things about Jim's version.
I am in East Brunswick, NJ, just north of the Princeton area. Not exactly Philly, but not too far.
You are welcome to come listen to them here.
I have a Modwright SWL 9.0SE preamp, and ASL Hurricane (with Response Audio mods) amps. Digital or analog front end.
Bill