Conrad Johnson GAT preamp Mint customer trade-in

  
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Mint customer trade-in 
Conrad Johnson GAT preamplifier
Excellent condition, most of warranty remaining, new tubes.

The GAT Preamplifier embodies conrad-johnson’s latest
advances in line-stage preamplifier technology. We believe that it will quickly
be recognized as the new industry-wide reference standard for line-stage
preamplifier performance, a role filled for more than a decade by its legendary
predecessor, the ART preamplifier. Like the ART, the GAT Preamplifier will be
available in a numbered, limited edition of 250 units which will be sold
through selected conrad-johnson dealers.

The GAT Preamplifier is a vacuum-tube, line-stage
preamplifier that looks as good as it sounds. It is also notable for
convenience and ease of use. The unit features input selection and level
adjustment by microprocessor-controlled relays. Level and balance can be adjusted
in 100 steps of approximately .7 dB per step. All functions can be controlled
by the hand-held wireless remote control.

The circuitry of the GAT Preamplifier is elegant in its
simplicity. The audio circuit consists of a single amplifier stage incorporating
one composite triode comprised of paralleled sections of a
high-transconductance miniature dual triode vacuum tube. This amplifier stage
is coupled to the preamplifier outputs through a high-current MOSFET buffer,
which achieves a very low output impedance, making the GAT extremely flexible
in the choice of interconnect cables and amplifiers. DC voltage is supplied to
the circuit by our latest discrete voltage regulator that isolates the audio
circuit from the power line by maintaining negligible impedance across the
audio frequency band. Infrasonic noise is minimized by operating the tube
filaments (heaters) on a dc voltage supplied by another discrete regulated
power supply.

Considerable care and attention have been paid to the
physical aspects of the design as well. Microprocessor controlled relays, used
for selecting sources and level setting, are located right at the input
connectors, keeping signal paths short to minimize crosstalk between channels
and inputs. The vacuum-tubes are isolated by a suspension system designed to
minimize microphonics. The dramatic casework features attractive clear Lucite
tube guards outside the chassis, allowing for easy access for tube replacement.

At conrad-johnson we have long appreciated that the full
potential of any circuit can only be realized by using the finest available
parts. Each part for the GAT has been selected on the basis of both sonic
performance and durability. The audio circuit (including the level control) is
executed entirely with precision metal foil resistors and proprietary CJD
Teflon capacitors. Tubes have been carefully hand selected for minimum noise
and microphonics. The dc regulated power supplies use the same quality
resistors as the audio circuits. Capacitors for the power supplies are
exclusively polypropylene and Teflon – there are no electrolytic capacitors in
the audio circuits or their related power supplies. All signal switching is
done by special relays designed for signal applications. These relays are
sealed and have gold plated silver contacts. Input and output connectors are
machined from oxygen free copper, and are gold plated. The GAT is built without
compromise to achieve a new standard in musical performance, and it is built to
last.

Specifications

Gain: 25 db

Maximum output: 20 vrms

Output impedance: under 100 ohms

Distortion: less than .15% THD

Frequency response: at unity gain: 2 Hz to more than 10OKhz

Hum and noise: 100 db below 1.0 v

Tube complement: 2 x 6922

Dimensions: 15.375D x 19W x 4.81H inches

Total weight: 35 lbs.