McAllister Audio has developed and manufactures an in-house implementation of the classic Jensen 990 discrete operational amplifier. The design utilizes a precision-matched monolithic bipolar input pair with a predominantly discrete signal path incorporating current-mirror loading, a high-gain voltage amplification stage, and a complementary Class-AB output stage. The result is a high-performance gain block offering low equivalent input noise, wide bandwidth, high slew rate, excellent linearity, and substantial output drive capability for demanding professional analog audio applications.

Signal level selection is accomplished with a Swiss-made 47-position Elma precision rotary switch, selected for its exceptional mechanical accuracy, repeatability, and long service life. Gold-plated contacts, tight indexing tolerances, and low, stable contact resistance ensure precise gain settings while preserving signal integrity. The switch provides deterministic channel-to-channel tracking and reliable long-term performance in demanding professional analog audio applications.

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McAllister Audio designs and manufactures its own custom mu-metal input transformer in-house, drawing inspiration from the revered Japanese studio transformers of the 1970s. Wound on high-permeability mu-metal laminations and enclosed within mu-metal shielding, the design was voiced as much by ear as by instrumentation. Rather than pursuing sterile perfection, the transformer was engineered for harmonic texture, dimensionality, and musical engagement—an unapologetically analog interpretation of industrial synesthesia and groove.

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