The 76 is general purpose amplifier triode, designed for use as oscillator, detector or amplifier. The characteristics are identical to Type 56 except that the 56 has a 2.5 Volt heater.
The Triad brand name on the base cap. The triode section is placed high-up in the envelope.
The stitched anode is supported by the outer rods and stabilised mechanically by the top springs touching the envelope.
A closer view.
The classic envelope is 38 mm in diameter and, excluding the UX5 base pins, is 88 mm tall.
References: Data-sheet, 1040 & 3002. Type 76 was first introduced in 1940. See also1940 adverts.
