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The 35C5 is an audio output beam tetrode designed for series heater chain use on US mains voltages.

The data-sheet gives the 35C5 as electrically equivalent to 35B5 and - within its ratings - to the 35L6GT.

The Type designation repeated on the reverse.

The original box.

Thanks to Mark Mallison for sending the images.

The thin glass tube envelope is  mm in diameter, and excluding the B7G base pins is  mm tall.

References: Data-sheet & Data

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.