Cypher Labs Sustain84 Vacuum Tube Headphone Amplifier

Cypher Labs

Featuring NOS ECL84 tubes in a class A single ended design, the Cypher Labs Sustain84 (model CLS84) is a headphone enthusiast’s dream.

  • Designed specifically for headphone amplification, the Sustain84 has a pure black background. The power band is suitable for the most sensitive IEM’s and the most demanding planar magnetic headphones. We chose Z11 Output Transformers from Japan as well as Nichicon Electrolytic Capacitors and Cardas RCA input connectors. We incorporated a specially designed switching power supply and quality fuse for ultra low noise. Many power amps feature a headphone output, but the Sustain84 is an Uncommon amplifier of headphones.

    • ECL84 tube compliment/
    • Power cable (USA 3 prong style)
    • Machined aluminum enclosure/
    • Removable tube shields (tube shields can block magnetic interference)


  • Tube: ECL84 (6DX8 tubes may be substituted by the customer)

    Input: RCA Jacks

    Input Impedance: 10K ohms

    Input Sensitivity: 700mV

    Output: 6.3mm

    Output Impedance: 8 to 600 (Japan Z11-EI48 Output Transformers)

    Output voltage: 14Vp-p

    Headphone power: 0.08W@600 ohms; 0.16W@300 ohms; 0.36W@100 ohms; 1W@32ohms; Low gain 2db, High gain +17db

    Frequency Response: 30-30Khz (+-1db)

    Auto-switching AC Voltage: 100-250V AC

    Power Consumption: 20W
    Standard IEC input with fuse protection (2A Fuse)

    Weight: 2.5kg

    Dimensions: 225mm (w) x 116mm (d) x 113mm (h)