Sensibly equivalent¶ to:
The B729 is a pair of separate amplifier triodes within the same envelope. The two sections are separated by a metal screen.
The B729 was developed for domestic television receivers and the heater has controlled conditions such that it can be used for parallel operation on a constant 6.3 Volt supply or within a 300 mA series heater chain.
The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 47 mm tall.
References: Data-sheet & 1040. Type B729 was first introduced in 1958.
Absolute Maximum Operating Conditions¶
Updated January 14, 2013. shape:thin.glass.tube construction:all.glass type:double.triode age:1950.1960 base:b9a heater:6.3v pins:9 pin:1.a pin:2.g1 pin:3.k pin:4.h pin:5.h pin:6.a pin:7.g1 pin:8.k pin:9.s