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Frank's electron Tube Data sheets Precision 660  

The Precision 660 tube tester with my DIY socket adapter
Circuit diagram
Circuit diagram tubes part only
G140 adapter
Coletronics Flyer
Test Data :
Tube-list in excel (updated 2018-12-01)
H2B Rolchart
TRC HB
TRC 63-10
TRC 65-08-15
TRC 65-10-01
TRC 65-10-25
TRC 66-04-01
TRC 66-06-25
TRC 67-08-09
TRC 68-10-01
TRC 69-04-01
TRC 70-02-01
TRC 70-06-01
TRC 70-11-01
TRC 71-02-15
TRC 71-06-01
TRC 76-01-01
Form 660 TDC (9-59) transistor test data