Decware Z-stage Triode Gain Stage Single Input Preamp

Original owner. Approximately 6 months old with very low hours.

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All options were added at purchase such as a Stepped Attenuator ($100) and Beeswax Caps ($130). Gold volume control knob available if preferred.

The ZSTAGE is a single-input, single-ended triode stereo gain stage. It uses a single tube operating in class A with no negative feedback. It accepts any standard 2 volt line level source like a CD player or DAC and has a variable output via the front mounted gain control. It can also be used as a purist tube preamp where multiple inputs are not needed.

Designed for 24/7 operation it is always on, and always warmed up and ready. The lower voltages that make this possible aren't even enough to get the tube hot to the touch. It does however greatly lower odd-order distortion and increase even-order harmonics making everything sound better.

SPECIFICATIONS

Weight 7 lbs. ea.
Dimensions 2.5" H x 6" W x 11.0" D
Circuit type Single ended Class A
Gain Adjustable from 0 to 15 volts with a 2 volt source (17.5dB Gain).
Input voltage 5 volts max
Output Impedance <1000 ohms
Input Impedance 47 K ohms
Noise / Hum -80db V / -62db V
Response 10 Hz ~ 90 kHz
Feedback ZERO negative feedback used
Rectification UN4007
Signal tube 12AU7 or 12AT7
Transformers Decware
Biasing Self-Biasing
Resistors precision WW/MF by DALE, VISHAY
Signal Cap Polyurethane Film Caps or Beeswax Foil Caps
AC cord Removable power cord
Consumption 13.5 watts at the outlet
Input jacks RCA type 24K Gold
Output jacks RCA type 24K Gold