This is custom made tubed preamp. You may visit Don's website for a little background on him. This preamp has all the upgraded caps, etc. The only thing I could have added would be a wooded case. I opted to save the $500.00 and put it the upgrades that would affect the sound quality. There are a few reviews online through his website if you care to look.Come with a very heavy duty power cord. I'm also sending this pair of Mark Williams interconnects. Paypal ad shipping fees will be paid by me. Insured for what you pay for the unit. A fantstic sounding preamp. Khozmo remote control (64 step), it is completely quiet. Thanks for looking.