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This VT-121 is an acorn triode valve made by GE. The construction is almost identical to the VT-121.

The acorn valves were the product of RCA research into making high frequency valves. The requirement was to make a linear reduction in all dimensions so as to reduce the inter-electrode capacitances. The acorn types had about half of the capacitances of other valves of the mid 1930s and could operate at up to 400 MHz.

The acorn envelope is 14 mm in diameter, and excluding the pins is 30 mm tall.

References: Data-sheet ¹⁰⁴⁰. Type VT-121 was first introduced in 1934. See also 1934 adverts.

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.