660T Cossor Top Pip Power Valve balloon shape audio amplifier

Description

This is a rare, early Cossor power valve type 660T.

It was certainly designed for public address use.

There is no such amount of information on the web either, we have tried to gather some info for what we have in our hands.

It is a large, tall valve about 230mm tall and 85mm wide.

We assume it is a 7.5 Volts filament 750 Volts Anode.

The valve has good filament which glows correctly and appears to be in working order.