The Conrad-Johnson LP70S is a high-end tube power amplifier designed for discerning audiophiles who value both musical beauty and technical precision. Delivering 70 watts per channel into 4 or 8 ohms, the LP70S embodies Conrad-Johnson’s renowned sonic character — smooth, natural, and deeply engaging.
At its core are four 6550 output tubes (two per channel) operating in ultralinear configuration, providing a perfect balance between power and tube sweetness. The amplifier’s wide-bandwidth design and high-current power supply ensure effortless dynamics, while its proprietary CJD Teflon capacitors and meticulously hand-soldered point-to-point wiring preserve the purity of the musical signal.
The LP70S’s minimalist circuitry and precision craftsmanship result in an amplifier that’s as visually elegant as it is sonically stunning. Expect lush midrange textures, sparkling highs, and deep, articulate bass — hallmarks of the Conrad-Johnson legacy.
Specifications
Power Output: 70 watts per channel into 4 or 8 ohms
Circuit Type: Ultralinear push-pull tube design
Tubes:
4 × 6550 output tubes (2 per channel)
2 × 6H30 driver/phase inverter tubes
Frequency Response: 20Hz – 20kHz ±0.25dB
Total Harmonic Distortion: <1% at rated power
Input Sensitivity: 1.0V for full output
Input Impedance: 100 kΩ
Output Taps: 4Ω and 8Ω
Power Supply: Custom-wound transformer with heavy-duty filter capacitors
Dimensions (W × H × D): 19" × 8.375" × 15.375" (48 × 21 × 39 cm)
Weight: 68 lbs (31 kg)
Finish: Champagne gold faceplate with black steel chassis
Key Highlights
70W per channel of pure tube-driven authority
Handcrafted in the USA by Conrad-Johnson
Ultralinear design for optimal power and harmonic balance
Premium CJD Teflon capacitors for exceptional transparency
Wide soundstage with rich, lifelike tonal accuracy
Built for long-term reliability and musical satisfaction
