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The 1B3GT is a extra high voltage rectifier for supplying the final anode of picture tubes in television applications. The very high voltage capability makes the 1B3GT suitable for use in colour television receivers with a final anode requirement of 20,000+ Volts.

This is an American design and is optimised for 525 line receivers.

Working at voltages of the order of 25,000 Volts means that the electrons striking the anode will generate soft X-rays. The design of a bell shaped anode with the coated filament high inside the bell is to minimise the release of these X-rays. In service the line output valve and the EHT rectifier would be located in a screened compartment to shield the users. The filament supports are just visible.

The wide glass tube envelope is 29 mm in diameter, and excluding the IO base pins is 87 mm tall.

Reference: Data-sheet. Type 1B3GT was first introduced in 1946. See also 1946 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.