need help to identifying this transformer

[El-even]

Hi folks,

question about power supply...again
i had long time searching informations about the transformer of the sunn beta power amp and i've just found this fresh and clear upload of the schem; finally i can read some new details on it but i need some help to determining the secondaries voltage.

I read 66VAC and +/- 40v on outputs,
can you confirm the transformer may be  120V / 2x40V 66VAC ?

66/80=0,825A or 66/40=1,65A ?.. in any case, i find this very low for a 100W amplifier (4ohms speaker, 2x12" combo)

I think i confused VAC and VA; so the secondary(ies) seems to be 2x33v... how then have +/-40v in the end

the other information i have from the manual is [400V 27A rectifier]