Jackson 648 Tube Tester Model with manuals

Description

This is a 'project' tube tester. I got it with a collection of tubes. I have two other tube testers that have already been calibrated so I have no need to fuss with this one.
It appears to have been unused for some time so I did not plug it in. The face is complete and in good condition. The proper knobs and buttons are all there.  They all work though one knob needs to be rotated slightly on the control shaft. The push-button switches could stand cleaning or lubricating. The roll chart moves smoothly. The case is well worn and discolored. The latches have light rust. It opens, closes, and latches OK. The serial number is M14-152.
Two manuals and an old roll-chart are included.
Due to its age and condition I am unable to test this unit. It is being sold "as-is for parts" without warranty.
Check my feedback. I pack carefully and ship promptly. However, I ship only to the contiguous USA.