So I have a spare Lepai 20watt stereo amp sitting around. I have used it to amplify the headphone signal from my Boss multi FX into an 8" guitar speaker. It seemed good enough to work. I want to get a cheap preamp (eg. Behringer Tube Ultragain MIC100) and then wire some jacks up to have an FX loop between the preamp and the Lepai.

Does all this seem workable? Even if I don't have an FX loop, will pairing the tube preamp and the Lepai as a power amp work?

Thanks for any help.
^ He's right.
“Ignorance more frequently begets confidence than does knowledge.”
Charles Darwin