Nature Coast Electronics Reference 2A3 SE 2026 - Natural Anodize / Solid Gray Surround

This is a custom-designed hand-built 2A3 single-ended high-fidelity stereo amplifier.

The 2A3 output tubes are auto-biased with a unique AC filament supply that delivers virtually inaudible hum even on 100 dB full-range drivers.

A 10-turn hum-balance potentiometer per tube, top-panel accessible, is refined with exclusive circuitry:
Millivolt AC precision centering, unique fixed DC cathode tap for rock-solid bias isolation. No degenerative feedback. No filament strain.

Dead quiet black background, velvet mids, deep textured soundstage, bass with weight and control.

The driver stage uses a paralleled 6922 dual triode per channel, loaded by a constant-current source (CCS) for linear, low-impedance drive.

Two-stage design with only one premium pure copper foil/polypropylene/oil-immersed coupling capacitor between input and output.

Non-inductive cathode bias resistors and Silmic II bypass capacitors.

Power supply provides responsive, clean voltage rails for effortless dynamics by using low-noise fast recovery solid-state rectification, specialized choke filtering, multi-stage Nichicon 105°C capacitors.

NCE proprietary modular pcb construction and custom design aluminum panels.

Output transformers: USA-made, 10-watt rated for wide bandwidth.

Includes:
• (2) Sovtek 2A3 + (2) Sovtek 6922 (new, tested, burned-in)
• Pre-adjusted hum balance — tubes marked L/R
• Power cord

Specifications:
• Power Output: 3.5 W RMS/channel
• Frequency Response: 20 Hz–20 kHz ±1 dB
• Input Sensitivity: 1 V RMS for full output
• Speaker Output: 6 Ω (4–8 Ω compatible)
• Hum & Noise: < 1 mV – virtually inaudible
• Power: 120 VAC, 85 W, fused @ 1.6 A Slo-Blo
• Size: 15.25" W × 12.25" D × 8" H (with tubes)
• Weight: 25 lbs
• 2 Year Warranty – includes return shipping