Sensibly equivalent¶ to:
The PCC189 is a low impedance high gain double triode. The technical specification specifically states that it is built with frame grids. The valves are variable μ types for use at RF as AGC controlled devices. The low voltage high current suggests a low noise design, probably as the front end stages in a television tuner. The low anode voltage suggests both stages used as a cascode (series connected) amplifier.
See PCC88 for the single μ or straight version.
The triode sections appear as separate structures. The anode is significantly larger than is found in most double triodes. The size and the blackening of the anode all point to these being run at significant current.
The thin glass tube envelope is 20 mm in diameter and excluding the B9A base pins it measures 46 mm long.
References: Datasheet & 1040. Type PCC189 was first introduced in 1960.
Absolute Maximum Operating Conditions¶
Updated February 23, 2013. shape:thin.glass.tube construction:all.glass type:double.triode age:1960.1975 base:b9a heater:300ma pins:9 pin:1.a(2) pin:2.g1(2) pin:3.k(2) pin:4.h pin:5.h pin:6.a(1) pin:7.g1(1) pin:8.k(1) pin:9.s