I suggest you try Googling driver amplifier for spring line reverb. I did, and one of the results is
http://sound.westhost.com/articles/reverb.htm which has some useful information and a link to another site,
http://www.accutronicsreverb.com/, which you should look at. Also check out other Google results.
The preamp you linked to uses an IC that appears to be obsolete, and is probably NOT suitable for driving a spring line unit directly. The characteristics of a spring line driver transducer seem to be a bit variable, but generally similar to headphones, which is why I suggested a headphone amplifier. There are many headphone amplifier circuits around; just use Google to find them. Go for one that's either all-discrete (i.e. no op-amp), or uses one or more op-amps but includes a discrete output stage, for higher current.
It would also be useful to know the characteristics of your spring line unit; read the Elliott Sound Products page (first link) for details.