Dating triad transformers
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Power transformers convert power-level voltages from one level or phase configuration to another.
For example if you have 606-432 on a transformer, you can tell that it's a Schumacher transformer from the '606', the year is either 1974, or a 1964, from the '4', and the '32' is the week of production.
The model type, or number, is sometimes stamped on the transformer frame, or bell, as well; for example 022798, telling us that this is the power transformer from a Fender Super Reverb.
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