I deleted part of my post because I thought I was going on and on and on. I had written that I was in an Electronics Explorer post and one of the guys had the ST-300. By then Quadrophenia was the only reference left to quadraphonics.

I believe my ST-120 was made in the very late 70's or early 80's. I had one heck of a time cobling together a 51 volt zener diode to replace the one that had blown. (along with a 2035 transistor in the final drive and one in the powersuppy for good measure.) It really was a great sounding amp. I think the tube stuff only sounds better because the distortion harmonics are interpreted differently by the brain. The new amps are so clean that you generally won't hear it at all. Since I was listening to Led Zeppelin and Jimi I wasn't really going to hear "nuance" anyway.

The last pair of speakers I built used a pair of Madisound 6 1/2 inch woofers above and below a cloth domed Peerless tweeter. The design was 100% budget driven but the efficiency was outsanding. They'll still make your ears ring for a week if you aren't careful. Not exactly deep bass, but then I wasn't listening to Rap or Mozart. I think you could almost smell the lighter fluid on Jimi's guitar.