P1_Cossor

Good evening

I just found a tube that looks much like a Cossor P1 in an original Cossor P-Type box,

printed "P.1." on it.

The tube has the typical Cossor tin-hat anode and is obviously a bright emitter

(see picture @3,5V/0,8A). It has no coloured spot.

However, it differs from other Cossor P1 tubes in some respect:

1. It has a one-sided metal mirror inside - most of the others don't

2. It has a black socket instead of a brown one

3. There is no type information etched in the glass dome.

4. However it has etched in the glas dome: "VALCO Ltd.   REPAIRED   Wimbledon" (see pictures)

Maybe our english colleagues have information about this repair company and wether it might be a P1 despite of the differences.

Best regards

Adalbert Gebhart

Pièces jointes

• p1 with box (52 KB)
• p1 tinhead (49 KB)
• p1 engraving repaired (58 KB)
• p1 engraving clear (40 KB)
• p1 bright emitter (41 KB)