The links didn't work for me, either.
Although I did search and find that our buddy Dave now advocates performing his magic on the HK 247. For only $300
Quote:
The modification to this unit cleans up the bass, improves the width and depth of the soundfield (along with location), improves the overall clarity of the unit, gives the unit a more spacious, penetrating sound, and improves the transient response of the piece. This highly dynamic and detailed receiver competes and bests amplifiers and receivers that are thousands more in cost.
http://www.stereodaves.com/modifications.php
I'm going to guess that the answers are maybe, no, and no.
Sounds like snake oil to me.
Sorry. I must be grumpy.
