12AX7 Mullard Long Plate Valve Tube, MC1 B6K Code Used Tested (89)

Old Mullard logo

British made

Long ladder anodes

Double bar D getter

Made at the Blackburn factory

Factory code: MC1 B6K

Test results:

A1- 1.75ma  2.1gm

A2- 1.8ma  2.15gm

Test as new

Supplied in plain white box