• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Anyone have the specifications for Leak Stereo 60 mains transformer

A good source for these types of queries is UK Vintage Radio.

Here is a snippet from Radiomuseum ...
Hard to read if it is 360V or 380V, probably the former. Current requirements should be fairly easy to derive.
Skärmbild 2024-02-05 153252.png
 
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There are clearer schematics out there and it's 380-0-380. You'd want a minimum of 300mA current capacity for the high voltage winding, at least 7A for the 6.3 volt, and 2A for the 5 volt. With a decent margin to keep the transformer running cool, I'd look for 350-400mA for the HV windings and 8A for the 6.3 volt.
 
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