Dark2A — Tube Optical Leveling Amplifier.

A schematic-accurate emulation of the legendary Teletronix LA-2A — the smoothest, most musical vocal and bass compressor ever built. Authentic T4B electro-optical attenuator, 12AX7 tube gain stage, and UTC HA-100X output transformer modeling, calibrated against the original hardware spec.

Topology:

T4B Photocell — dual-stage release with program dependency (the signature LA-2A "self-adjusting" feel).

12AX7 tube gain stage with authentic harmonic profile.

UTC HA-100X output transformer modeling.

18 Hz sidechain HPF (LA-2A 15 Hz spec).

Always-on R30/C6 sidechain tilt (intrinsic to the LA-2A schematic, independent of HF Emphasis).

30 ms RMS detector, 450 ms GR decay, 3 s slow release — calibrated for the relaxed, "rounded" LA-2A response.

Peak Reduction tuned to pin the needle at 20 VU on typical program material.

x2 / x4 / x8 Kaiser FIR oversampling.

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