Good sounding 70's live LPs...

If you're into progressive jazz, check out Brand X's "Livestock" (with Phil Collins). Outstanding live recording from the 70s. Joni Mitchell's "Miles of Aisles" is also excellent, but obviously not a rocker.

Good bass from live albums (vinyl) of the 70s includes:

ZZ Top - Fandango
Brand X - Livestock
Genesis - Seconds Out
Supertramp - Paris
Albert King - Blues Power
Outlaws - Bring It Back Alive
The Who - Live At Leeds (new remastered from Classic)
King Crimson - Red

From the 80s:
Peter Gabriel - Plays Live

I'm sure I'll think of a few more

Don't know if it is 70's, but Deep Purple Made in Japan is great. I also think Bob Seger "Live Bullet" is very good. I will have to think about this some more.

There's a nice one by the Allman Brothers... at the Fillmore, I think.