Krell KST 100 Voltage settings

[Atrox69]

Hi there dear members!
I have bought me a Krell KST 100 amp and im curious if there is anyone out there with the information about the voltage settings on this one??
I do have the exploded view of the amp but there is nothing that tells me how the voltage is changed. I would be grateful to get some help on this one!!

 

[huggygood]

 

[Turbowatch2]

I suppose the schematic is right. So, if you have 240V in your country, both switches should show the "2".
You can verify this by measuring the resistance of the mains plug. When you switch from "1" at switch 2 to "2" the resistance in Ohm should double.

 

[Atrox69]

Thank you Turbowatch2!!
I have a strange humming sound that appears randomly when the amp is powered up. The sound is like a Hmmmmm sound probably coming from the power supply area. When the amp is on and have reached the working temperature this sound appears from time to time, sometimes its sounding for 30 seconds and then dissapears again. Any idea what the sound is about??

 

[chrisng]

You can verify this by measuring the resistance of the mains plug. When you switch from "1" at switch 2 to "2" the resistance in Ohm should double.

X4 in resistance.