W3 Wuncell by Cossor 1925 dull emitter audio output valve – WR1 Cossor Wuncell

Description

The Cossor W3 dates from 1924! They also come with original boxes, a radio’s  delight! Like other Cossor of this type the W3 is a dull emitter with oxide-coated filament and green paint on top pip. We also show a pair of W3 without green paint. Both W3 are shown from the right of main picture.

The Cossor WR1 Cossor  from 1924, like above W3 the filament is tungsten oxide-coated  and is a dull emitter triode with a built-in filament resistance of 8 Ohms. The Wuncell has also a shorting screw to operate at 2 volts LT for accumulators as  well as six volts as bright emitter. Amazing valve!