The 6Z7 is an unusual double triode. It is designed as a Class B push pull audio amplifier. It operates from low anode voltages as found in universal mains sets and delivers a respectable power of 4 Watts. Rl is 12,000 Ω.
The internal structure is obscured by the internal metalising. What can be seen are two anode cylinders of about 6 mm diameter. These are formed of sheet metal and are carbonized.
The classic envelope is 37 mm in diameter and, excluding the IO base pins, is 85 mm tall.
References: Data-sheet & 1043. Type 6Z7 was first introduced in 1938.
Absolute Maximum Operating Conditions¶
Updated January 29, 2013. shape:classic construction:pinch type:double.triode age:1930.1940 base:io heater:6.3v pins:8 pin:1.m pin:2.h pin:3.a pin:4.g1 pin:5.g1 pin:6.a pin:7.h pin:8.k