Hitmaker 4000 Colour Module

80's British Hitmaker Console for Chroma, Mister Focus, & DIYRE Colour   Overview HITMAKER 4000 brings solid state British console sound to the Colour format. This circuit was inspired by the classic VCA console's Mix Amps through which thousands of hit records have been mixed since the early 1980's.   The heart of the famed mix bus was a balanced summing architecture with a hybrid combination of a discrete quad-matched transistor input and a then-state-of-the art Signetics NE5534A op amp to provide open loop gain and load-driving capability.  While a dual amp NE5532 could have been chosen to simplify the design and reduce cost of this Colour module, the audio performance of the NE5532 is not the same in terms of distortion, soundstage, and overall tone.  Our design respectfully pays homage to the original console's Mix Amp by using multiple IC stages of a carefully selected modern production NE5534A that best matches the depth and tone of the out-of-production Signetics part.  An