Groove Tubes Specifications:
ViPRE™ VARIABLE IMPEDANCE VACUUM TUBE PREAMPLIFIERVARIABLE IMPEDANCE INPUT Custom-wound transformers loadmics at 300, 600, 1200 or 2400 ohms, multiplying the performancepotential of every microphone. Additional transformerless balanced bridged, line and instrument inputs.

AUTHENTIC VU METERING Custom-built, back lighted VU meterwith five switchable viewing ranges.

VARIABLE RISE TIME Select between five amplification styles
ranging from Smooth-and-Classic (Slow) to Bright-and-Modern(Fast). These first two exclusive Vipre features alone provide 25unique tone-shaping combinations from any single mic!

WHAT THE EXPERTS SAY...
“I heard the ViPRE demo at the NY AES show in New York and Ibought one right away...and got great results I would not havebeen able to obtain otherwise. This is not just another first classmic pre - this box can help you get sounds out of your mics thathave eluded you up until now.” Walter Becker (Steely Dan)ALL TUBE, BALANCED CLASS A Eight Groove Tubes in a fully
differential signal path dramatically lowers noise and distortion –while expanding bandwidth (flat from 7Hz to over 100kHz!).

“I've used it on voice, guitar, and bass, all with stunning results!”
Frank Filipetti (James Taylor, Carly Simon, Elton John,Barbara Streisand, Pavarotti, Celine Dion, many others)

PRECISION GAIN CONTROL No pots! Custom-built ceramic deck
attenuators control ViPRE’s incredible 75dB of total gain in 5dB
and 1dB stepped increments for precision gain while maintaining
the integrity of Vipre’s fully balanced signal path.

“After extensive listening tests comparing it to all other mic preamps at my studio, the ViPRE came out way on top in terms ofsound clarity and depth.” Michael Wagener (Dokken, Ozzy
Osbourne Janet Jackson, Stryper Alice Cooper, many others)

ViPRE

SPECIFICATIONS

Input Impedance

Mic: Selectable 300Ω/600Ω/1200/2400Ω
Balanced Bridge Mode: 2.4KΩ
Balanced Line: ?2.4KΩ
Instrument: 470KΩ
Mic In , Balanced: +10dBm
Mic In, Balanced Bridged: +14dBm
Balanced Line: +30dBm
Instrument: +26dBm
Mic In: 75dB
Mic in (Bridged): 64dB
Balanced Line: 44dB
Instrument: 46dB
7Hz - 100kHz ±1.5dB-129dB
600Ω (+4dBm), 10kΩ (-10dBV)19”W x 14.75”D x 5.25”H (3U rack)(48cm W x 37.5cm D x 13cm H)
28 lbs. (12.7kg)

Maximum Input Level

Maximum Gain

Frequency Response
Equivalent Input Noise
Output Source ImpedanceDimensions
WeightAll specifications subject to change without notice0106-JKC-VIPRE

ViPRE FEATURES:• Award-winning tube preamplification for microphones andinstruments• The ultimate preamp for tracking vocals, guitar, bass, piano,keyboards, horns, strings, ensambles, or any source that requires
the very best in tube preamplification• Front panel: Impedance selector (300Ω/600Ω/1200/2400Ω),
Input Selector, High pass filter (75Hz), Polarity reverse, MuteSwitch, Phantom Power (+48V), Variable Rise Time Selector (5way switch), Ceramic deck attenuators controlling gain in 5dB
and 1dB stepped increments• Front panel instrument input (1/4”Hi-Z); Rear panel mic(XLR) and line (1/4” TRS) input connectors; XLR and 1/4” TRS
output connectors• 75dB of total gain (Mic Input), using eight hand-selected GT
tubes in a fully differential signal path
• Custom wound, very high-quality input and output transformers

www.groovetubes.com