Mcintosh 2301 tube amplifier, how much power used from the wall?

Curious if anyone has measured actual watts coming from the outlet to power the the 2301 mono amplifier?

Basically I'm interested to know what the power use is for purposes of calculating how much heat this amplifier gives off, ie btu.

It uses 8 kt88 tubes, which indicate a spec of around 40 W per tube, hoping this is right. Not sure how much these watts are used when amplifier is at moderate volume. The remaining six tubes on the amplifier power are smaller and have minimal power use