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The 6C5G looks like a screened pentode and not an audio triode. The suggestion is that it was developed from the 6J7G screened pentode. Inside there are two grids - control grid and an outer grid strapped to the anode. The above article has more details.

The reason type 6C5 disappeared from the lists fairly early is that it was superseded by the 6J5 which had slightly superior ratings and characteristics but was, for all practical purposes, a direct replacement.

Most 6C5s were of the metal-envelope type whereas most 6J5s were 'GT/G' and therefore suitable for a wider range of applications. NB. Type 6SN7GT is two independent 6J5s in one envelope.

The pinch and outer screens.

The classic envelope is 37 mm in diameter and, excluding the IO base pins, is 89 mm tall.

Reference: Data-sheet. Type 6C5G 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.