Arcam AVR300 - relay switched adjustable rails?

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Joined 2018
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Looking at toroidal trafos on ebay and an interesting one came up out of an Arcam av receiver. I downloaded the manual and found the trafo windings.

It seems that the main power amp section rails are switchable by a relay. I dont know what controls the relay.

Am I right in my assumptions here.? Looks like it can either run on the 36v or 29v rails.

Why might this be, just out of interest?

Thanks
 

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