Many of the official AC supplies were built post war. Mine is dated 1952.
Yes, they are heavy due to the transformer. That is their weakness though. All the windings are on one core so when a winding shorts you have a very heavy boat anchor or tie down for aircraft. The rectifier tubes are also a problem as they short quite easily taking out a winding. I use mine with care bringing it up on a variac to 110V max.
The transformer is virtually impossible to rewind.
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