By setting the amplifier characteristic between voltage and current mode, the overall performance is optimised for good bandwidth with minimum distortion.
In time, his high-gain circuit mods became in such high demand by guitar players that production line amplifiers based on these custom circuits were released.
The amplifiers are named for the cloth covering, which consists of varnished cotton twill, incorrectly called tweed because of its feel and appearance.
Power output ranged from a few watts to perhaps 20 watts for an exceptionally powerful amplifier (modern semiconductor amplifiers produce much higher power).
