Check out the Hattor preamps. This is from the same folks that make the Khozmo attenuators which are highly regarded. I'm using a Khozmo attenuator in my DIY preamp and an thrilled with the sound quality and reliability.
They have a model with a tube output buffer. The standard gain is 9db, but they may be able to configure a lower gain if desired. They are very easy to work with.
http://www.hattor.com/tubeactivestage.html
They have a model with a tube output buffer. The standard gain is 9db, but they may be able to configure a lower gain if desired. They are very easy to work with.
http://www.hattor.com/tubeactivestage.html