Sensibly equivalent¶ to:
The ECC40 is an early all glass double triode. The picture shows on the lower right part of the envelope the locating pip. Early versions of B8A valves used metal skirts to aid the correct location of the eight eqi-spaced pins into the holder.
The anode for each triode is made from two plates that are pressed to form a central clyindrical cavity and notched to form lugs that hold the carbonised plates together.
The thin glass tube envelope is 22 mm in diameter, and excluding the B8A base pins is 51 mm tall.
References: Datasheet, 3002 & 1040. Type ECC40 was first introduced in 1948.
Absolute Maximum Operating Conditions¶
Updated January 31, 2013. shape:thin.glass.tube construction:all.glass type:double.triode age:1940.1950 base:b8a heater:6.3v pins:8 pin:1.h pin:2.a(2) pin:3.g1(2) pin:4.k(2) pin:5.a(1) pin:6.g1(1) pin:7.k(1) pin:8.h