Hi Stan,
First, a disclaimer. I am not an electronics geek, so my advice comes to you as an owner of tube and solid state gear. So, while I have researched this issue a bit in the past, I cannot explain any potential issues in any detail. Having said that, it appears from the specs. that I could find on the web, the output and input impedances for the two units should be acceptable to each other.
Also, having briefly looked at the specs on your equipment, I do not think that your proposed set up will solve your problem. You have a very low powered amp driving relatively inefficient speakers (84dB), and I am not certain if any additional gain, if available, will really solve your problem. I see two solutions - buy more efficient speakers, or use a more powerful amp in place of the Miniwatt. Perhaps you could use the LD to power some type of affordable solid state amp?
Good luck,
--Ken