Just plug it in. Give it at least 24 hours of play time before you reach any conclusions as to 'sound'.
Need advice
I am new to this and need advice .
I have just become aware of some hiss coming from my preamp, Audio Research LS 2B Mkll. Think it might be caused by the tube ? Current tube Electro Harmonix 6922,
What tube should I replace it with for least noise and best sound?
Is there anything else I need to do ?