 The second revision was the "Purple Stripe" Mark III, which featured a purple marker stripe above the power cord.This amplifier was identical in component values and R2 channel as the later Black Stripes, but had a lead section much closer to a IIC+

The third revision was the "Red Stripe" Mark III which featured a red marker stripe above the power cord.The amplifier had lead mode circuitry almost identical to the IIC+ and some minor changes in the preamp to make it similar in circuitry to a IIC+.