Originally Posted by
Barry
The mains transformer does not appear to be shielded or shrouded with a mu-metal shield, so depends on the transformer core laminations not having any flux leakage. The transformer is however located distant from the electronics, so the effect of any flux leakage is minimised; although an additional magnetic shield between the transformer and the nearby valves wouldn't do any harm.
Rectification is provided by a pair of solid state diodes, rather than a double-diode valve, so putting the power supply in a separate enclosure would not offer any real benefit; it would just cost more.
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