Quote:
Originally Posted by russell_w_b
I use one of these as our hall telephone, but it's an Ericsson PAX instrument I acquired from the BBC Kirk o' Shotts transmitter PAX system - far less exotic! Note that on the photo I have a lettered dial plate which is incorrect - I don't believe these telephones were ever sanctioned as a GPO instrument. I have since reverted to the original numeral-only dial plate.
The innards are just a 332 chassis and any conversion is identical.
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except the GPO used it as the wall version of the Tele310/Bellset 41 combination - fitting it with a relay inside, rectifiers & extra capacitor (and no second bell!) and called it the Telephone 311. The Tele 310/BS41 (introduced 1947) and the Tele 311 (introduced 1950) didn't have a long life. Within a couple of years the 'Thermistor 1A' replaced the relay and rectifiers etc - and the Telephone No 312 (table version) replaced the Tele 310 in .1949 - Most Tele 310s were converted to Tele 312s. However for some reason the Tele 311 wall phone was introduced c1950 with the built in relay but wasn't that long before it was replaced by the more rounded Tele 321.