Welcome Skids!
my audio adventure started with 70s vintage radio shack as well, I had a sta-2100 receiver and two pairs of radio shack speakers, the original Mach ones and Optimus t-200’s and supertweeters ! One of my daughters has the receiver and still works, a nephew Who is a teenager is enjoying the Mach ones! I rebuilt the crossovers for him!
This is is a great site, lots of friendly help! Enjoy your stay, kik off your shoes turn up the volume, grab your favorite beverage and have fun!
barryg