The 6F28 is an amplifier pentode of high mutual conductance designed for television service and introduced by Thorn-AEI (Mazda) in 1961. It is also known as the EE80.

It was designed for use as a video amplifier where the high mutual conductance makes it easier to achieve a reasonable stage gain and wide bandwidth.

The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 52 mm tall.

Reference: ¹⁰⁴⁰. Type 6F28 was first introduced^¶ in 1961.

 
Absolute Maximum Operating Conditions^¶

Pentode	Vh	Ah	Va	Vs	Vg	mAa	mAs	ra	gm
	6.3	0.3	180	180	-2.9	10.0	2.5	0.31M	12.5