JACKSON TUBE TESTER MODEL 648R + 10 PIN ADAPTER *RARE*

Description

See pictures.
Nice vintage Jackson 648-R Dynamic Tube Tester. Includes the 10 pin decal adapter I believe is model JA-10. I've never had the chance to use this beauty.  Powers on when plugged in but that's all I know. Looks like the previous owner had it opened up and I've left the screws out. Ephemera includes technical bulletin, tester data set, new tube releases, special tube data, inspection tag, CRT 440 (not included) instruction manual. The 648R was produced from 1958 - 1961.
As with all vintage electronics sold "As Is".
Please contact me with any questions and thanks for looking.