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Conrad-Johnson CT6
SOLD $6,000.00
OCT
2009
A/V Revolution Review
Manufacturer's Website
Introduced in the internationally
acclaimed Anniversary Reference Triode (ART) preamplifier, and recently
refined in our current flagship preamplifier, the ACT2, conrad-johnson’s
composite triode circuit has provided the benchmark for line-stage
preamplifier performance for nearly a decade. Reviewers, other audio
professionals, and consumers alike have been impressed by the fine
resolution of subtle shadings of dynamics and the solid, stable imaging
that this circuit is capable of portraying. We are pleased to announce
our most affordable implementation of this circuit in the CT6 line-stage
preamplifier.
The composite triode circuit is a conceptually simple design—based on
creating a single “super” triode by paralleling sections of individual
tubes. In this way, the entire amplification circuit can be reduced to a
single active stage, without buffers or feedback. Any active circuit
element will color the sound, whether the element is an amplifier or a
buffer stage. By designing a line stage consisting of a single composite
triode, we are able to reduce the circuit to the absolute minimum of a
single active element.
In the CT6, the composite triode is comprised of four paralleled
sections of high-transconductance miniature twin-triode tubes. This
circuit achieves a sufficiently low output impedance to drive most
interconnect/amplifier combinations while eliminating any circuit
element that might compromise its sonic purity. To realize the full
potential of this amplifier stage, it is powered by a sophisticated
discrete voltage regulator designed to completely isolate the audio
signal from the power line.
All control functions of the CT6 operate through
microprocessor-controlled relays. For the level control, the relays
select combinations from a network of precision, low-noise metal foil
resistors to effect loudness and balance changes in 100 steps of
approximately .7dB per step. All switching and adjustment can be
controlled by the unit’s remote control. A Theater Mode, which passes
the input signal through at unity gain, makes it simple to incorporate
the CT6 into a high quality home theater system without compromising its
two-channel performance.
High quality component parts specified for the CT6 have been carefully
selected for unrivaled sonic performance and reliability. All capacitors
in the audio circuits and related power supplies are polypropylene or
polystyrene, and the resistors in these circuits (including the CT6’s
level control) are special low inductance, high-precision laser-trimmed
metal foil resistors. Switches are sealed relays with gold-plated silver
contacts. Even the custom machined input and output connectors have been
selected for their sonic excellence.
Through meticulous engineering, careful selection of component parts,
and painstaking attention to construction detail, we have created in the
CT6 a true reference quality preamplifier at an attractive price. We
invite you to arrange an audition with your conrad-johnson dealer to
experience for yourself the extraordinary musical accuracy of the
conrad-johnson composite triode preamplifiers.
Specifications:
CT6
Gain: 26 db
Maximum output: 15 vrms
Output impedance: 850 ohms
Distortion: 1,0V Output less than .25 THD
Frequency response: at unity gain: 2 Hz to 10OKhz
Hum and Noise: line-stage 100 dB below 2.5 V
Phase: phase inverting
Tube complement: 4 x 6922
Dimensions: 15.5D x 19W x 3.315H inches
Total weight: 19 lbs.
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