Hello all! As many of you have read from my previous thread - I have just purchased this 73 SVT in incredible shape and since its my first tube amp i'm not sure what is considered normal. Is a certain amount of "low level" hum expected? Seems to be just shy of conversation level but is enough to be annoying. The tone is of this amp is awesome and all switches, inputs, knobs work great - no other issues besides the hum and fan noise. Is there a way to minimize the hum and a way to reduce the fan noise?