On Monday, July 21, 2014 8:33:57 PM UTC-7, Tom Miller wrote:

Sounds like an Astron AS20 or similar. The transformers are made with cost
in mind and they do run hot even at no load.

Oh, that should be 'run hot especially at no load'. The losses in transformers
might be maximum when NO SECONDARY CURRENT IS DRAWN, because
of core saturation effects. So, it makes sense to power-down at the
input of such a power supply, not at the output.