It's a member of the 30A1/B1/C1/D1 chassis family and is covered in Riders vol #3.
You can download a scan of the Riders from the ETF here:
http://www.earlytelevision.org/pdf/a..._rider_tv3.pdf
It was Admiral's workhorse chassis in '48-'49 and used 10", 12" and 16" CRTs including: 12BP4, 12LP4, 12TP4, 12KP4 and 12QP4. There are notes on page 33 about minor wiring/component differences for each type.
Good luck
