Getting back to the original enquiry, my guess is that the characteristics are not too critical.

sounds from the original description that the transistor is being used as an on -off switch, and the voltage is known, the current it must pass can be measured. The soviets made Germanium Transistors for long periods after they faded in the west, so they do turn up from the same band of sellers who sell soviet Nixie tubes. (there: list content)

My guess is that a germanium transistor may not even be really needed, perhaps a trial of a 2N3906 from the parts bin will do?

or am I dreaming in technicolour as usual?

--
Charles MacDonald                 Stittsville Ontario
cm...@zeusprune.ca              Just Beyond the Fringe
http://Charles.MacDonald.org/tubes
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