For sale is a used Hafler DH-101 Stereo Preamp. I have gone through this unit and replaced all the electrolytic capacitors. I used high quality Nichicon Muse BI-Polars and Nichicon Fine Gold for the power supply. The preamp has been fully cleaned.  It was tested for a couple of days and works like it should. Sound? Fantastically warm and inviting. Smooth top to bottom response with a definite lack of stridency known to other transistor units.These preamps have a definite following. I built my first DH-101 in the 80's!  All sales are final. You will not get stuck with a non-functioning preamp. US sales only. Will you be happy? Check my feedback. I work hard to insure you are happy with your purchase.