Lindell Audio LiNTEC – a single-channel, two-band studio equalizer in the program EQ tradition, with filter topology based on the classic Pultec EQP-1A. Solid-state instead of a tube output stage, custom-wound inductor, bespoke transformers, and an OPA 1731 op-amp – each unit hand-matched to within ±0.25 dB of the next, built specifically for confident stereo pairing.
Why solid-state over a tube
Lindell's decision to drop the tube amplifier from a Pultec-style circuit is backed by measurable reasoning: solid-state delivers a faster transient response while retaining the smooth, creamy low-end character the topology is known for, produces lower self-noise, and – critically for professional use – achieves unit-to-unit consistency that vintage tube hardware simply cannot guarantee. Every LiNTEC leaves the factory matched by hand to within ¼ dB. The OPA 1731 op-amp is the same discrete circuit used in Lindell's VIN and Retro 500 Series compressors. Input and output transformers are custom-designed exclusively for this unit. Notably, the LiNTEC adds harmonic content to signal even with all EQ controls at zero – transformer and op-amp coloration is always present in the signal path.
The Pultec low-end trick and everyday bus work
The LF section operates across 5 selectable frequencies (20, 30, 60, 100, 150 Hz) with independent boost and attenuation controls sharing the same frequency selector. Applying simultaneous boost and cut generates the well-documented Pultec low-end response: gain added below the selected frequency with a gentle dip immediately above it – tightening the bottom end without mid-bass buildup. The HF section offers 11 positions for boost and 8 for cut, with independently selectable frequencies and a shared Bandwidth control. All pots are stepped for fast, repeatable recall and straightforward stereo matching without test equipment. Hard bypass, IEC mains inlet, and balanced TRS I/O round out a clean, no-compromise layout in 2U.
KEY FEATURES
- Single-channel Pultec EQP-1A-style program EQ, solid-state design
- Lindell Vintage OPA 1731 op-amp, custom input and output transformers
- LF: 5 selectable frequencies (20, 30, 60, 100, 150 Hz), independent boost and cut on shared selection
- HF Boost: 11 selectable frequencies; HF Cut: 8 selectable frequencies, shared Bandwidth control
- All potentiometers stepped – reliable recall and stereo matching
- Factory calibration to ±0.25 dB between units – confident stereo pairing
- Hand-wound inductor
- Hard bypass switch
- Harmonic coloration active even with EQ set flat
- I/O: balanced TRS 6.35 mm jack, IEC mains inlet (internal PSU)
- Format: 2U rack
TECHNICAL SPECIFICATIONS
- Type: single-channel, two-band program equalizer (Pultec-style)
- Circuit design: solid-state, no tubes
- Op-amp: Lindell Vintage OPA 1731 (discrete Melcor 1731 interpretation)
- Transformers: custom-designed for Lindell Audio
- Inductor: hand-wound
- LF Boost/Cut frequencies: 20, 30, 60, 100, 150 Hz (±10%)
- HF Boost: 11 positions; HF Cut: 8 positions, shared Bandwidth
- Unit-to-unit matching: ±0.25 dB
- I/O: balanced TRS 6.35 mm jack
- Bypass: hard bypass
- Power: internal PSU, IEC inlet
- Format: 2U, 19"