Guitar Amplifier PCBs |, Guitar Amplifier PCBs design and manufacture printed circuit boards for guitar amplifiers enabling amp builders inexpensive access to classic sounding amps. The 18 Watt LiteIIb "Baby Will" PCB is a circuit board designed after the Volume/Tone channel of the legendary Marshall 1974X handwired guitar amplifier. The 5 Watt SuperLite II is an another variant of the Marshall 1974x.