My first reply never showed up in my email so please excise me if this is a double post.... but here goes
I dont know that i prefer analogue over digital restoration.... i use a combination of both depending on the nature of the material i am transferring to cd.
My first analogue black box is a 31 band 1/3 octave equalizer which i use for playback equalization. I have a flat preamp and starting with known recording curves tweek the curve so it sounds natural.
Another very useful analog tool is the professional "Dynafex DX2" for reducing surface noise hiss. Designed for tv and analogue tape transferring from non noise reduction encoded material (78s etc).
The Dynafex is a noise gate which reduces the band with during softer passages and open up with increasing signal amplitude. It also includes aural exciter to enhance the highs so there in no apparent loss of hi frequency definition.
How about those flat sounding compressed discs and tapes .... my DBX 2DX does wonders bringing them back to life. This is a 3 band frequency divided veriable ratio expander which reverses the compression used in the disc recording process.
At this point im ready to use Brians Declick digital program ... thus starting any digital processing of the signal i have digitized with an MAudio 2496 sound card,
Theres where i begin hope it helps