AUDIO VALVES: ECC33 CV2821 TWIN TRIODE

The ECC33 is a low impedance double triode with high gain. It featured separate cathodes and was designed for use as AF voltage amplifiers, phase splitters.  Many affectionados prefer this valve to the more common ECC32  variants because of the lower impedance and the curiously smaller and very rigid para-ellipsoid electrode cage which makes for a very stable, low noise base floor non microphonic dry incisive sound.   The wide glass tube envelope is 28 mm in diameter and, excluding the IO base pins, is 62 mm tall.