04-23-2013, 04:01 PM
Nostalgia Air has schematics for 30 or so Sterling models, including one called "8 Tube Receiver." I only looked at a few and didn't find one that matched your tube set, but it might be there.
http://www.nostalgiaair.org/Resources/396/T0000396.htm
http://www.nostalgiaair.org/Resources/396/T0000396.htm
John Honeycutt