11 Set stuff

[Chris Suslowicz]

Originally Posted by Tim Bell

I thought these were standard British Army wireless Voltmeters and suitable for a whole range of radios, not specifically the WS11.

What makes it just for the WS11 please?

I have the case... looking for the meter.

Thanks

Tim

It's that well known item, the "multipurpose part" and was used with a lot of sets.

It's Voltmeter, Pocket, 250 Volt, No.2 ZA.7372 and the matching case is ZA.7369.
They were standard issue for testing HT and LT batteries, plus valve electrode voltages on sets such as the R107 that has a test panel fitted to the front. (Also for general faultfinding on sets like the R109.) They are not a particularly brilliant meter for this purpose, having a sensitivity of 500 ohms per volt, and at one point there was a shortage of suitable meter movements which led to the issue of the Voltmeter. Pocket, 250 Volt No.3 with 350 ohms per volt sensitivity, and correction tables for various working instructions with the corresponding (lower, due to the extra circuit load) "nominal" readings when testing the set.

They turn up at amateur radio rallies fairly regularly in the UK, and tend to be dismissed as "useless junk" and are therefore cheap. Unfortunately the plastic (celluloid?) windows tend to degrade and make it difficult to use - though it's not difficult to replace them with a piece of sheet perspex/plexiglas of suitable thickness.

Chris