Damn @ericsch, again! I too got a C-26, along with the MC2100, which was the version of the 2105 without meters. $499 vs. $649, iirc. $150 doesn’t sound like much now, but back then I guess it was! From there is was onward and upward: an ARC SP-3 and D-51 and D-75 amps, with Maggie Tympani’s. By 1972 Sound Systems was no longer pushing SAE and Infinity, but rather the hipper ARC and Magneplanars.
Yeah, San Francisco was (is?) a great town for seeing live music (but then so are L.A., NYC, and Austin). I saw the first appearances of Cream, Hendrix, and Jeff Beck, plus all the old guys Bill Graham booked into his venues, like Albert King.
With my musical tastes I kinda wished my Dad had stayed at Lockeed Aircraft in Van Nuys (he transferred to Lockheed Missiles & Space in Sunnyvale)---I then coulda seen Buffalo Springfield, Love, and all the other SoCal groups/bands emerging at the same time the hippie bands were up North. I saw The Dead and Airplane in ’67, but they’re not really my kinda thing.