A dream came true - R2R.

[adrianywu]

Hi Adrian, I really see no difference in difficulty. All my previous ones had passive networks, but I just modified the Marantz 7 with a feedback network, and it was just as easy. I just did it for an educational Youtube video, not expecting any miracle but the result exceeded my expectations.

If one knows what he is doing, he can put together a very, very, very good head pream for just $250 in parts.

Agreed. Or buy a second hand phono pre (such as yours, or a new one !) to modify. I have not tried modifying active RIAA set ups, but I guess it just takes some experimentation to get an accurate response. A Marantz 7 would be quite intriguing.... How does it sound ?