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

The specs show it can draw 5.5A at 120VAC, or 660 watts. Of course, some of that power is used to drive the speakers - only some of it is wasted as heat.

I don't think the specs reflect what really happens. If it is that much it will heater room like a portable heater set to low Times two.

The only way to do this is to measure it from the wall.

What reaches the speaker is a minor part of the equation.

For example, the 600 W Mac amplifier only uses 60 to 70 watts when turned up very loud. 

I sniped this from ChatGPT:

The amplifier's power consumption varies depending on its operating conditions. Under typical usage, with normal audio signals and average volume levels, the MC2301 consumes around 800 watts of power per channel. Since it is a stereo amplifier, the total power consumption for both channels combined would be approximately 1600 watts.

If chatgbt is correct, that's absolutely horrifying.

That means this amp is equivalent to a full blown portable heating unit running continuously, and the heating units are about 1800 W on the high mode.