Overview: Part of Trace Elliots' late '80e early '90s series six range of Valve bass guitar amplifiers. This is the baby one which came in two versions, a head and a 1x15" combo with the GP7 pre-amp. Twin valve refers to it's dual 6550 output valves which make an apparent 115w RMS whilst the larger models in the range were Quattra and Hexa Valve sport 4 tubes (220w) and 6 (300w+) respectively. These larger models (available as head only) also feature the larger and heavier featured GP12 pre-a