CV492, Brimar, MIlitary Specification, 12AX7, 17mm Anode, Long Plate, June 1953 Manufacture 1953
CV492, BRIMAR, MILITARY SPECIFICATION, 12AX7, 17mm ANODE, LONG PLATE , MANUFACTURED JUNE 1953
On offer today we have a Brimar white print 12AX7 made at the Brimsdown plant and carrying a date code for June 1953. Not only does this device carry a military cartouche but also civilian white inking too.
For Va = 250 V Vg = -2.0V against a nominal specification of anode current Ia = 1.2 mA and mutual conductance gm = 1.6 mA/V, the following results were obtained:-
A1 Ia = 1.1 mA gm = 1.6 mA/V
A2 Ia = 1.1 mA gm = 1.6 mA/V
As you can appreciate this represents good matching of each triode section within the envelope and a device showing superb emission.