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The KTZ63 RF amplifier pentode, equivalent to a 6J7G was also noted as a low noise audio pre-amplifier.

The clear glass envelope and the solid screen within.

Below the screen can be seen the bright anode and the supports for the three wire grids.

The top of the screen, grid supports and connection from the control grid to the top cap.

Looking up from the base and betweens the screens.

The classic envelope is 37 mm in diameter and, excluding the IO base pins, is 97 mm tall.

References: Data-sheet & ¹⁰⁴³. Type KTZ63 was first introduced in 1937. See also 1937 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.