[NJARC] NRI 70 =? which Precision model?

[sgt88 at atlanticbb.net]

Got my tube tester last night..that NRI 70...$17.50 at the auction...wonder 
who/why the other bidder wanted it??...( found no treasure trove, alas. )

Anyway...it seems like the NRI unit was made by Precision...who made 
identical models using their own nomenclature...all in their 600 series 
models.

Found the Precison 600's schematics & manual on line...might take me a 
"while" comparing all those schematics to the wires in my unit.

Anybody know which Precison model 6?? is the NRI 70?

Also, there's a clipped wire protruding in-between 4, 5, and 6 pin 
sockets...might this be the grid cap lead?

Now...on to the bench with it....

Regards,
Steve T.