CV4004, MULLARD, BOX ANODE, ECC83, Δ1 6F4, HEERLEN MANUFACTURED, JUNE 1956

CV4004, MULLARD, BOX ANODE, ECC83,   Δ1 6F4,  HEERLEN MANUFACTURED, JUNE 1956

On offer today we have a Mullard white print ECC83 made at the Holland Heerlen plant and carrying a date code for August 1958.

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 = 1.7 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.