KT66 OUTPUT BEAM TETRODE GREY GLASS BROWN BASE MATCHED PAIR FROM
Well, here's a tasty pair of devices both with grey glass, brown base "coke bottle' KT66 in GEC livery.
The device carries markings in excellent white ink, a classic GEC/M-OV cartouche with a date code which equates to 1956. The brown low loss micanol bases are both tight to the valve envelopes.
These devices have been tested using our AVO VCM163 against the specification for 100% emission of anode current, Ia =63 mA; mutual conductance gm = 6.3 mA/V @ At Va = 250V Vg = -15V.
The results obtained were:-
Ia1 = 70 mA.
gm1 = 5.2 mA/V.
Ia2 = 76 mA.
gm2 = 5.5 mA/V.
These test figures indicate not only a very strong pair of devices which EXCEED nominal specifications but also are a supremely matched pair - not to be missed.
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KT66 OUTPUT BEAM TETRODE MATCHED PAIR CLEAR GLASS BROWN BASE SAME FACTORY CODE FROM APRIL 19647