Groove Tubes Specifications:
SuPRE™ STEREO UNIT VACUUM TUBE PREAMPLIFIERThe SuPRE borrows some key features and design components fromboth the award-winning ViPRE and the critically acclaimed Brick for an
extremely flexible, great-sounding and yet very affordable solution forstereo mic and instrument preamplification.
The SuPRE is a two-channel stereo microphone and instrument preamplifier that uses a high resolution tube signal path for legendary
Groove Tubes tone and response. Like the ViPRE, it features variabletransformer impedance settings on each channel (300/600/1200ohms), with 4 custom-designed Nickel core input and output transformers. The SuPRE provides a hefty 72dB of gain on each channel,
using 4 specially selected GT pentode/triode dual element vacuum
tubes (2xGT6922 dual triodes and 2x GT6GH8 pentode/triode tubes).

between rear panel Line or Mic inputs, while a front panel Instrument
input automatically overrides the rear panel jacks when an instrument
is inserted. A 3-position attenuation switch drops mic levels, selectable
at 0dB, -15dB and -30dB, while dedicated switches for Polarity Reverseand 75Hz Hi-Pass Filtering are provided. SuPRE’s +48V phantom
power is available on each channel. Large custom rotary variableattenuators control gain over the available 72dB range. Supre’s twolarge custom VU meters, each with individually adjustable range control, allow for 0Vu line-up with virtually any outboard gear.
Designed for both tracking and stereo mastering, the SuPRE implements precision and closely matched components to ensure perfectstereo imaging.

The SuPRE’s front panel packs in a lot of control features whileremaining cleanly laid-out and easy to use. An input switch selects

SuPRE

SPECIFICATIONS

Input Impedance

Mic: Selectable 300Ω/600Ω/1200Ω
Balanced Line: 20kΩ
Instrument: 22MΩ (no attenuator),
500kΩ (with 20dB attenuator)
Mic (1200Ω, -30dB pad in): +18dBu
Mic (1200Ω, pad out): +3dBu
Balanced Line: +28dBu
Instrument: +4dBu (no attenuator),+24dBu (with 20dB attenuator)
Mic: 18dB - 72dB
Balanced Line: -40dB - +32dB
Instrument: 36dB (no attenuator)
10Hz - 50kHz, +0/-1dB-126dB A-weighted+27dBu (@1% THD+N)
600Ω min, >2.5kΩ recommended150Ω min, >1.2kΩ recommended19”W x 17”D x 5.25”H (3U rack)(48cm W x 43cm D x 13cm H)
29 lbs. (13.2kg)

Maximum Input Level

Gain Range

Frequency Response (XLR)
Equivalent Input Noise
Maximum Output Level (XLR)
Output Source Impedance (XLR)
Output Source Impedance (TRS)
Dimensions
WeightAll specifications subject to change without notice0106-JKC-SUPRE

SuPRE FEATURES:• Two channels of high-quality tube microphone and instrument
preamplification• Excellent for tracking vocals, guitar, bass, keyboards, horns,strings, or any source that benefits from stereo or dual-mono
tube preamplification• Perfect as a superb stereo mastering preamplifier• Front panel: Impedance selector (300Ω/600Ω/1200Ω), Micattenuation (selectable for -15dB or -30dB), High pass filter(75Hz), Polarity reverse, Mute, and Phantom Power (+48V), allindividually controllable on each channel• Dual front panel instrument inputs (1/4”Hi-Z); Rear panel mic(XLR) and line (1/4” TRS) input connectors; XLR and 1/4” TRSoutput connectors• 72dB of gain on each mic channel, using two GT pentode/triode
vacuum tubes per channel• Four custom-designed nickel core input and output transformers

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