Some of the best pre amps used for $600 or less

Throw the Quicksilver Audio tubed linestage into the mix, can be had used for about 600. I almost purchased the dared as well, if I saw one come up used for 300 I would definitely jump on it.

I second the Doge 8. Sorry now I sold mine now. Not sure you can get one for under $1000.00 used though.

You might want to look into the Mapletree Audio linestage, two box, tube regulation, variable gain, and $760 new! Made by hand, point-to-point by a retired Canadian electrical engineering professor and audiophile.

There is allot of Krell stuff that SHOULD BE 600, but people keep overpriceing this stuff. It is great if one can get it cheap enough and when it breaks you don't really need to worry- just get another one if it is cheap enough.

musical fidelity a3cr, hard to find cause they usually sell quick at $600 or under