12AX7, Brimar, Long Plate , Manufactured February 1961, ECC83
12AX7 BRIMAR, LONG PLATE , MANUFACTURED FEBRUARY 1961
On offer today we have a Brimar white print 12AX7made at the Brimsdown plant and carrying a date code for February 1961.
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 follwing results were obtained:-
A1 Ia = 1.2 mA gm = 1.5 mA/V
A2 Ia = 1.1 mA gm = 1.4 mA/V
As you can appreciate this represents good matching of each triode section within the envelope and a device showing superb emission.
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