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ET3 Valve Line/Phono Preamplifier w/Remote

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Our Review Sample and in excellent condition.


At conrad-johnson, development of their flagship products has traditionally led to important enhancements of our entry-level offerings.  The ET3 preamplifier is a case in point.  The ET3 line-stage is a “baby” version of their flagship line-stage preamplifier, the GAT.  The family resemblance is much more than skin deep.  With voltage gain provided by a triode vacuum-tube, the zero-feedback line-stage circuit of the ET3, along with its DC voltage regulators, closely replicates the circuit of the GAT.  Finally, and especially noteworthy, the ET3 features a relay operated discrete stepped attenuator level-control circuit of the type found in the GAT and CT5, absent only the balance control function found in those more costly models.

Functionally, the ET3 provides highly flexible I/O facilities with six separate line-level inputs (including one “tape” loop), plus a theater loop that facilitates use in a home theater system.  In addition, the ET3 offers the convenience of infrared remote control of all functions.

For vinyl enthusiasts, the ET3 is optionally available with a vacuum-tube phono stage that borrows its zero-feedback audio circuit from our reference quality TEA1 phono stage.  Customers can choose between high gain (recommended for cartridges with a rated output of 1.0 mV or less) and low gain (recommended for cartridges with rated output greater than 1.0 mV) versions of the phono stage. Input resistive loading is switch selectable over a range from 47 kOhms down to 200 Ohms.  The ET3 phono stage is built to the same high quality standard found in the ET3 line-stage.

It would be fair to say that the only thing “entry-level” about the ET3 is its price.  You’ll be surprised at just how affordable true high-end performance can be.


ET3 line stage
Gain:  25 dB
Maximum Output:  20 Vrms  
Distortion:  less than .15% THD
Impedance: 100 Ohms 
Freq. Response: 2 Hz to more than 100 KHz 
Hum and Noise: 98 dB below 2.5 V 
Phase: phase inverting
Tube Compliment: 1x 6922 

ET3 Optional Phono Stage
Gain: High Gain Version 54dB
         Low Gain Version  40dB
RIAA Equalization: +/- .25 db 20Hz to 20kHz
Hum and Noise: -80dB relative to 10mV input 
Phase: phase correct
Tube Compliment: High Gain Version  3x 12AX7
                              Low Gain Version   2x 12AX7, 1x 12AU7 

Dimensions: 13.125D x 19W x 3.315H inches

Weight: 13 lbs.



October 2010 Awards (Review)



October 2010 Awards (Award Winner)