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Interestingly, on the rear of this instrument from the early 70s, one of the mains input voltage options is 150 Vac (note that all of the remaining ones are not too unusual---100 V in Japan; 115 V in the older US; 127 V in some island nations; 220 V in the CIS and mainland Europe; and 240 V in the UK). Any ideas on where and when such an obscure voltage was used?

rear of instrument

Ruslan Nabioullin
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    It may be that this is just one of the additional ways to connect the primary side of a transformer and they whacked it in just in case. – PlasmaHH Jun 29 '18 at 08:57

1 Answers1

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From what Ive found, some areas in the uk in the early 1900s used 140 - 150V.

This might be of interest: link

andowt
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