ZEQD-Pre

The All-Analog Simulation Solution

A collaboration between EarthQuaker Devices and Dr. Z Amplification

This all-analog tube preamplifier brings together EarthQuaker Devices’ innovative pedal design and Dr. Z Amplification’s decades of tube amp expertise. With a passive three-band EQ, professional headphone output, balanced XLR output, and onboard analog cabinet simulation, the ZEQD-Pre delivers authentic tube warmth and dynamic response in a complete analog amplifier system that fits right on your pedalboard.

The Technical Side

Unlike the common 12AX7 triode (two elements plus cathode), the EF86 pentode has four internal elements plus cathode. This structure yields measurably superior performance:

*Gain Factor of 185: Significantly higher than comparable triodes
*44V RMS Output: Substantial voltage swing for enhanced dynamics
*Extended Frequency Response: Full-spectrum clarity from deep lows to detailed highs

What This Means for You

These specifications translate directly to playing experience:

*Touch Sensitivity: The EF86 responds to every dynamic nuance in your playing. Play lighter and it cleans up; dig in and it blooms. Natural expression that follows your hands.
*Full-Frequency Clarity: Extended response means harmonic richness without sacrificing definition. Bass notes stay tight, highs remain bell-like and clear.
*Responsive EQ: Higher voltage and broader bandwidth let the passive Three-Band EQ shape your tone effectively with minimal signal loss. The interactive controls behave like classic tube amp tone stacks—predictable and musical across their entire sweep.

The EF86 brings hi-fi performance to tube preamplification while staying responsive and musical.

https://www.earthquakerdevices.com/zeqd-pre