Hi..ok and ok....then that should be a relatively straight forward chase(?), same as with a valve-amp....no voltage at transformer = break. Are their any 'conditioner' inductors on the line side of the transformer?
Is the main switch also switching .the neutral? Is the neutral actually only a 'phantom' A broken neutral can show continuity but fail under load. Check active and neutral at the outlet....I realise this sounds 'derr' but it can happen that the neutral is supplanted by a long path to earth. In the two cases I have experienced it over 50 years, it was a loose neutral connection at the incoming mains and a loose wire at the MEN link ....however if the rest of the house is all ok...it could be the GPO (outlet) a check is only 30 seconds.for a certainty and a firm starting point . I think another chap sent you circuits.
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Jack
