You did awesome! I recently bought a Concert bass, a 1973 only missing the handle: $129 and a Red Knob Coliseum lead, 1975 for $200, and lastly a Sunn 215S with msimatched 15" for $200. So $500 is well, yer a bargain hunting STUD!! YOU DA MAN EVEN IF ALL 8 speakers are blown.
Peace and happiness to all.