I had a problem with the right channel of my Hafler DH-110 fading out, or
disappearing altogether. A good cleaning of the wire connectors INSIDE the
preamp fixed the problem and now it sounds great! I don't know if the DH-101
has similar heavy internal ribbon cables.

Search the Vintage Forum at audioasylum.com. I found help at

http://db.audioasylum.com/cgi/m.mpl?...ms&r=&session=

Best of luck.

jjhnsn