[Boatanchors] SB 200 question

[Ray Friess]

I notice the SB 200 meter is calibrated up to 3000 volts for plate 
voltage...

What should be the typical plate voltage reading on the SB 200 amplifier 
meter when wired
for 120 volt transformer primary input?    Mine shows 1800 volts ... 
which, if loaded to the manual
recommended 500 mils, would be about 900 watts ....    That makes sense 
because the SB 200
is a KW amplifier....

However, my friend's SB 200 meter shows about 2300 to 2400 volts and his 
is wired for 220
volts transformer primary voltage....     He says he gets about 750 
watts out when using about 80 to 90 watts out from the exciter...

Does the house current it is wired for make a difference on what the 
plate voltage is and what it
would show on the plate voltage meter scale?