Does anyone know what happened to SUMO Electronics?

Randy Patton last owned Sumo.... Rich May took over design after Jim died, He designed the Andromeda II and Polaris. Jason Stoddard was one of their last product designers,  Jason Did Polaris III, Andromeda III Athena II.  Randy had PS Audio, Meitner, Threshold and Sumo.  He sold off what he could and closed down the rest.  

@roberjerman 

Jim's Sumo Preamp was the Electra... Rich May did some tweaking and the called it the Electra Plus, Rich May then did the Athena.  
Jason Stoddard tweaked the Athena and that was the Athena II. 
James did the Andromeda... bipolar outputs.  Rich May did the Andromeda II with Mosfet outputs and Jason Stoddard did the Andromeda III with Mosfet outputs... Jim would not use Mosfets in an output stage. 

@marqmike 

Yep,  Rich Did Polaris and Jason did Polaris II and III.  I've listened to the Polaris many times,  I sold that piece, It had a slight coloration that was pleasant.  I've not sat in front of the Jason's Polaris models. I've been told that the III is quite good. 

Yep,  Jim Made Charlie the Tuner under Gas and Sumo Labels both.  The Sumo was a better sounding piece, the best sounding tuner that I have heard, but its reception was mediocre at best.  

JD, am I understanding that you are after an Electra Schematic? I'm not sure, but I may have one.  Please confirm before I go crazy looking. 

Here you go,  this should help. 

http://www.davidsaudio.com/Electra.pdf

JD,   one of my best friends still uses an Electra.  He has made a ton of cap improvements on this pre and it responded incredibly to the changes.  This pre already uses 1% metal film resistors, but it is full of sub par caps. so if you figure out the repair, do yourself a favor and replace the electrolytic and ceramic caps while you are in there. 
This old pre gets shockingly good.