The tube tested strong on the Jet-Check section of the B&K 707 tester (side 1: 112; side 2: 111, where 66+ rates as "good" - there is no life test applicable to tubes using the Jet-Check section as there is for more conventional tubes tested by the 707). 

Tubes are tested on a B&K 707 mutual conductance tube tester recently serviced and calibrated by Mike Mabry in Woodland, WA. Mike has been working on this series of testers for many years.   

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