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The Cossor 6BX6 is equivalent to the Mullard EF80 and in this example the lettering and logo is printed pale green.

Electrically it is an internally screened pentode and was a workhorse of the VHF TV receiver. The type was introduced in 1950. Much used for RF, intermediate frequency, and video amplification in 405 line television receivers.

The circuit designer is given maximum flexibility by having all electrodes brought to external pins. Many pentodes have g3, the suppressor grid, internally connected to the cathode.

The outer mesh screen has been replaced by a solid sheet in this version.

The thin glass tube envelope is 21 mm diameter and excluding the B9A base pins stands 57 mm high.

References: Data-sheet & ¹⁰⁴⁰ Type 6BX6 was first introduced in 1950. See also 1950 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.