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The TT10 (813) is a high voltage, low current beam tetrode. This is one of the largest valves used in HF amateur radio. Classic amplifier designs from the late 1950s would squeeze 1,000 Watts PEP from a single device for SSB use in class AB2. The input power for AM or CW would be 500 Watts.

The valve base would be mounted on spacers so that a blower could be fitted under the chassis and a stream of forced air cooling would pass over the envelope.

The anode is 52 mm long and 50 mm wide. The graphite is 1.5 - 2 mm thick.

The classic envelope is 66 mm diameter, and excluding the special base pins, is 165 mm tall.

References: Data-sheet & ¹⁰¹⁶. Type TT10 was first introduced in 1954. See also 1954 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.