ECC83, MULLARD, I65 , MULLARD, HEERLEN MANUFACTURED, OCTOBER 1964
On offer today we have a Mullard white print ECC83 made at the Holland Heerlen plant and carrying a date code for October 1964.
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 = 1.4 mA gm = 1.7 mA/V
A2 Ia = 1.4 mA gm = 1.8 mA/V
As you can appreciate this represents good matching of each triode section within the envelope and a device showing superb emission.
