To bring out the full potential of your little Harley Benton GA15 guitar amplifier, we've gone to great lengths to improve its mediocre design from the ground up. The resulting mods (described in more detail here) convert the little Harley from a dull 50% solid-state amp into a pure tube amp with a full, warm sound and great playing dynamics. Hum is greatly reduced. With a suitable extension speaker it gets enough power to play in a rock band!
The mod kit itself is comprised of a carefully selected set of electronic parts for implementing the mods. It also comes with a 27-page full-colour instruction manual, but to reduce costs, you might want to choose to just consult the online version, rather than ordering a printout.