ECC83 TELEFUNKEN GERMANY MANUFACTURED
On offer today we have a TELEFUNKEN white print ECC83 made in Germany . The base carries the characteristic diamong instamp which contains the numbers 30 & 2, the print is slightly smudged.
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 = 1.0 mA gm = 1.3 mA/V
A2 Ia = 1.0 mA gm = 1.5 mA/V
As you can appreciate this represents good matching of each triode section within the envelope and an EXCELLENT device.
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CV4004, MILITARY SPEC, ECC83, 641, R4D2, MULLARD, BOX ANODE, MITCHAM MANUFACTURED, APRIL 1964