No. 1015 1956-60 45 watts,
No. 1016 1959-60 35 watts,
No. 1043 1953-57 50 watts.
After 1960 the following transformers came equipped with circuit breakers:
No. 1010 1961-66 35 watts,
No. 1025 1961-69 45 watts,
No. 1073 1960-66 60 watts.
The only flaw I can find is that the No. 1026 produced from 1961-64 that didn’t have a circuit breaker...but then it would only produce 25 watts.
This theory is further substantiated by the production these larger transformers:
No. 1053 1956-60 60 watts, whistle control, with circuit breaker,
No. 1063 1960-64 75 watts, whistle control, with circuit breaker.
There seems to be a change over time for these transformers that is centered around the year 1960.
Reader information is solicited on this subject.
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