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The Cossor 210PG is a heptode or Pentagrid mixer and is also known as the 210SPG.The grid is wound with a variable pitch to give a variable-μ characteristic and so this would have been used in domestic broadcast superhet receivers.

The 210PG dates from 1934 and would have been fitted with a screw top cap, sadly missing as so many valves from this era seem to be.

The 210PG is a directly heated mixer designed for battery operation and with a filament current of 100mA could be used with dry batteries.

The reverse of the envelope is plain metallisation.

The classic envelope is 45 mm in diameter, and excluding the B7 base pins is 104 mm tall.

References: Data-sheet, & ¹⁰⁴³. Type 210PG was first introduced in 1934. See also 1934 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.