Samuel,
Thanks for your schematic scans, very nice to have this among the other pro-audio discrete op-amps in my tech archive.
As you probably allready know, Dane Jensen have design a lot of op-amps around the years, I think some of them was when he work for Quad Eight and maybe also Electrodyne.
BTW, besides my own development of discrete amp design, include op-amps, I have as a hobby to collect old time solid state pre-amps tech/schematic information, (and even orginal potted modules and cards) for both pro-audio and high end Hi-Fi gear.
It is very interesting to study why different euquipment sounds and behavior in a particularly way.
There are some designs that I`m very currios to examine, build, measure and listen on:
1. The very old "Holzer op-amp" (octal plug-in type) designed by David/Howard Holzer, the Haeco company USA.
I have heard that this op-amp was involved in many consoles that A&M studios use in the late 1960`s
2. The OP-amp Labs 360 and 425 series (octal plug-in type)
3. The console amp designs that the Sheffield Lab Recording/Douglas Sax and Bill Schnee use on the "Missing Link" records and the Telma Houston "I`ve Got The Music In Me"
4. And of course George Massenburgs older Op-amps types that he use in the first genaration equalizers and mike preamps.
I have search for this information under many years, but without result, if some of you have any idea, please let me know.
--Bo