Jerry Garcia’s McIntosh amp

The amp was correctly called in post #2 - an MC2300.  McIntosh amps comprised the Wall of Sound, not Phase Linear.  (48) MC2300 and a handful of MC-3500s were used.  Numerous drawings, photos, threads, and videos (including the one referenced just above), and even the Grateful Dead movie show the amps.  McIntosh even developed a bit of a marketing campaign around the fact that both Woodstock and the Grateful Dead chose McIntosh amplification and an even opened a Gradeful Dead exhibit at the R&R HOF - https://www.mcintoshlabs.com/brand/news/Grateful-Dead-Exhibit-at-Rock-and-Roll-Hall-of-Fame

Reportedly, Jerry played through one channel of the MC2300 only while on stage.  The particular MC2300 he was seen most often with has a sticker on it of a guy playing the guitar.  This was known as the Bud Man amp.  Just google "bud man mc2300" for many pictures of Jerry's setup.

Also reportedly, the MC2300(s) that Jerry played through were modified.  Some claim that Alembic removed the McIntosh sentry monitor circuit entirely.  Others claim that not to be true.  Rear panels had banana jacks added to them to facilitate quicker connections to the speakers.

At some point, after McIntosh introduced the MC2500 in 1980, Jerry did try one of these.  There are a handful of photos of him playing on stage with an MC2500 and not the Bud Man MC2300.  This didn't last long however.  Try as I may, I've been unable to determine why.

I met Bear in the 1990s, after running an ad on the Grateful Dead's website looking to purchase the McIntosh amps used in the WOS.  What an eclectic personality.  I sure wish I would have had the foresight to archive that convo . . . 

I have a bunch of these amps . . . 2300s, 2500s, and 2600s even.  The hype is real.   Have fun.  

There are many, many sites to be found which detail the gear well.  Here's one that I forgot about which shows a PL700 sitting atop a stack of MC3500s - http://www.epicdimensions.com/gdgear2.html

@acefqctory, have you listened to much from 1972? Barring personal opinions —and I don’t want to turn this great thread into a debate— but it’s hard to deny there is something special and something unlike any other year happening in ‘72. A telepathic locomotive of shared melody morphing on another level, imo...
 I just thought I add this in case any newbies or unfamiliar-yet-interested parties are reading. 

The early 70`s (wall of sound years) produced the best live recordings not because i was part of that it just takes one listen.

Unfortunately there is a lot of misinformation out there, people claiming this and that and some giving themselves credit for certain things. But who is left to dispute them? and the ones left do not care or have short memories. I just know that at the end of the Wall of sound i was given about 30 PL amps that i slowly sold over the years the last one just a couple of years ago. Some of the amps had printing and not script on the face plates which indicate some of the first.

This has indeed been a fun and informative discussion. A big thanks and a big hug to everyone who participated. What a long strange trip it’s been :)