Originally Posted by phelbin
I bought mine from a guy named Jamie Sutton. He's more of a console dealer, but was selling the house console from a small studio in Burbank he bought a while ago that is now his shop/office.
What would be the purpose of the insert bypass mod? And how would I figure out if mine has it...and if this was, in fact, your console?
Mama Jo's was in North Hollywood/Burbank, so that sounds like the one. No way there was more than one 40 frame that close. I've worked on that console.
You have a VERY nice sounding original Series 80, and it is nowhere near stock. Tasty mods were done to that desk. Pop out a channel strip and see if the opamps are LF351 instead of the (stock)TL071 or (some people's)NE5534. The LF351 was the coolest sounding in most of our opinions.
As far as the Insert Bypass. There is additional buffering curcuitry associated with the Insert Return that I don't like. It's a unity gain 100% negative feedback opamp design buffer and it's slew rate sucks, among other things. On the Series 80, that insert loop is a permanent part of the signal path, including the round trip through the patchbay, which includes a number of edge connector/PCB interfaces. It's needless if you're not using a piece of gear on the Insert.
So I used one of the Pre/Post switches for an Aux Send that I always wanted to be post anyway, and I used that switch to toggle between the Insert Return vs directly connecting the Insert Send to the back end of the channel. That allowed me to bypass the extra Insert circuitry whenever I didn't actually need to use the Insert on the channel.
Again, the way to really make that thing rock is to come straight out of the Insert Sends to the multitrack when tracking. More open and punchy going to tape than coming out the Multitrack busses. Whatl you get extra for coming out the Multitrack busses is some gain control you really shouldn't need anyway, plus a bunch of extra opamps and a not-so-hot summing amp.
Only real maintenance issue is the patchbay cards. Keep them clean and well seated.