Hello.
I'm from Poland.
I bought this model of preamp C-70 one week ago and I have a bit of problem.. . it's very hot.The temperature the back of the case is about 55 degree of Celsius ( I checked it the digital multimetr:)) It works with power output stage Yamaha M-70 (It isn't too hot, It works normal. with the loud speaker 8 Ohm. Do You think is it normal or too much hot?