Here's the link to a clip from what was, unfortunately, the unsuccessful pilot for a weekly "jazz in clubs" TV series hosted by comedian Mort Sahl. It was shot at the long gone, but not forgotten Black Hawk club in San Francisco sometime in the mid 1950s.http://www.youtube.com/watch?v=TV6nf2vxTa4
Based on conversations with many of the musicians who played there.
The EV microphones used by Brubeck to speak and for Mort to introduce the show were the only "PA" microphones. The two RCA 77s, the one in front of the sax and piano and the one placed high on a straight stand on the corner of the stage behind the floor tom side of the drums were the primary pickups for the TV audio. And yes, the same mic is picking up both the sax and the piano.
My older musician friends told me that when recordings were taking place was the only time "good" microphones were ever seen in the club. The owner was once quoted as saying “I’ve worked and slaved for years to keep this place a sewer.”
Note also the "old school" piano/bass/drums set up with the bassist at the pianists left hand and the drummer "behind" the piano bench. In those pre monitor days this put their heads in the closest possible proximity so they heard their balance as "the same" as they could.
There is no amplifier for the bass and no microphone even close to it but you can still hear the bass pretty well. Eugene Wright had a good BIG bass and could coax a lot of output from it.
At 4:50 and again in the long shot after 10:50 you can see one of the two "massive" open back baffles containing some kind of 12 inch "hi fidelity" speaker that served as the total sound reinforcement.