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Many SET builders like to use "industrial control transformers" for
power supplies. I looked through some catalogs and noticed a few
things:

1. The vast majority are designed to be mounted in electrical junction
boxes and have the taps on the top. The few with flying leads, again,
have them coming out the top.

2. Usually they have symmetrical groups of windings for 115, 230, or
460 volts., no center taps. So you tend to get awkward voltages either
on the lowish or highish side if you use capacitor filters. Choke
filters are not really feasible unless you build a separate power
supply chassis and even then they get expensive if you want reasonable
power levels.

3. Of course there is no heater or bias supply winding. So separate
supplies are de rigeur.

For most projects, using guitar amp transformers is the best way to
go especially if you can get them at dealer pricing.