A Designs KGB-Itf Instrument Preamplifier

Description

The KGB-Itf is a high input impedance, discrete audio preamp designed for high impedance, unbalanced signals including guitar, bass guitar and electronic keyboards. Just as a low-impedance, balanced preamp is a tremendous benefit for your microphones signal, a preamplifier designed for use with unbalanced high-impedance instruments is also a critical component of great sound from a high-impedance sound source.

The KGB Series contains high-voltage, discrete op-amps with balanced output transformers by Cinemag, Inc. The KGB-Itf is a single-channel, solid-state unit that works well with guitar, bass or keyboards. It features an all metal chassis, milled aluminum knobs, balanced XLR gold-pin Neutrik outputs, Switchcraft 1/4" input jacks, bipolar electrolytic capacitors, 1% metal resistors, blue LED power indicator, four rubber feet and heat vents, as well as three tone controls for high, mid and bass.

Features

• Single Discrete Input with Thru
• Gain Select Switch - High/Low
• Phase Reverse Switch
• Ground Lift Switch
• External Power Transformer for a very low Noise Floor
• Three-band fixed frequency Tone Filter with 12dB cut/boost: High/Mid/Low
• Balanced, line-level +4dB output

Specs

• S/N: Better than 90dB (shorted input)
• Output: Xfmr Balanced +4 @ 600 ohms
• Power: 20VAC (rated) 22-27VAC (unloaded) External, +/-24VDC Internal
• Gain: Low = 70dB, High = 90dB (2kHz source @ .775V)
• Gain: Low = 35dB, High = 60dB (2kHz source @ .09mv)
• Sensitivity: Lower than .09mv