I'd run that preamp for a week before taking it seriously. Electronics don't like sitting around for years without being run. Audio equipment has a way of not sounding right when you turn it on again (or ever- unless it gets serviced out after not running for a while).
The phono section is arguably the most sensitive part of the preamp in more ways than one. Give it some time!
The phono section is arguably the most sensitive part of the preamp in more ways than one. Give it some time!