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The 35T is a directly heated power triode for use at up to 100 MHz, at maximum input one 35T can produce up to 235 Watts of RF. The anode is small but can dissipate 50 Watts.

The 24G is constructed in a similar way.

The glass is very clear on this exhibit. The UX4 base is ceramic and this was probably used in airborne service.

The greenish/yellow glass where the anode pin passes through the envelope is uranium glass.

The grid is a cage of vertical rods - seen in the image as dark lines. The filament is an inner helix.

In this image it is just possible to see the thin helical wire that wraps around the grid rods.

Another attempt to get a clear view of the filament and grid within the anode.

This image was obtained with the microscope and strong LED light - hence the bright catch lights.

The wide glass tube envelope is 44 mm in diameter, and excluding the UX4 base pins is 122 mm tall.

Reference: Data-sheet. Type 35T was first introduced in 1951. See also 1951 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.