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Showing content with the highest reputation on 17/01/22 in all areas
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No idea, never seen one. T4 and 5 are just a link. T8 and 9 are -ve rails, one would likely be for the bell. Four top pins could have been SAB battery? One side of top pins is T6 the other is via the 1W resistor to -ve It's the era I'd expect tamper switches to be microswitches with flying leads from terminals. It would be logical to have all the field wiring on the first few terminals and the rest for the bell internals.1 point