This mod kit is comprised of a carefully selected set of electronic parts for implementing the “Ultimate Harley Benton GA15 Mod”, developed by Cosmic Ampworks. The printed 27-page full-colour manual is optional (view it online here).
Despite its charming looks, the little GA15 in its stock condition just doesn’t bring out the best in a guitar. The good news is however that it already contains all the basic ingredients that make a great tube amp! The value of the parts alone is already plenty of justification for purchasing a GA15.
Now, to bring out the full potential of the GA15, we’ve developed a number of drastic modifications to its original design from the ground up. These mods (described in more detail here) convert the little Harley into a pure tube amp with a full, warm sound and some nice power-tube overdrive on tap. They also reduce hum. With a suitable extension speaker the GA15 gets enough power (a bit more than 18 Watt) to play in a rock band with a loud drummer!
In the extensive step-by-step manual, modifications are arranged in order of increasing complexity so that, before diving into the deep, there is some room for learning along the way. Nevertheless, it needs to be said: the mods may be quite challenging to perform if you have no previous experience at all with electronics! A nice challenge for those long winter evenings?! A list of the required parts is provided on page 6 of the manual; the included tone capacitors are a mix of Mallory and Silver Mica types.