ECC85/6AQ8 Mullard Blackburn in GE box

Philips code on tube is complete

Tested for transconductance with B&K 747

readings: 112/105

Good/green on meter is 65-120

This tester is set to factory specs and checked frequently.

100 meg ohm grid emission test

Tube is allowed to heat and then gently tapped to check

for mechanical shorts.

No shorts or grid emission detected in this tube.

Two seams on top of glass, typical of

a Mullard.

Writing is basically complete on tube

Production date 64-39 (39th week of the 1964)

Halo getter

Gray plates

The tube in the pictures is the tube the 

buyer will receive.

Original box.  

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