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The 9D7 is a variable μ pentode. Brimar do not give a designated frequency range in their literature. As variable μ pentodes are used in AGC amplification systems, this suggests a role in IF amplification at up to 10.7 MHz.

The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 47 mm tall.

References: Datasheet, ³⁰⁰² & ¹⁰⁴⁰. Type 9D7 was first introduced in 1958.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.