Not seeing a Scroll to Top Button? Go to our FAQ page for more info.

Conrad Johnson preamplifiers



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 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.

Conrad Johnson ET7

The ET7 enhance triode line-stage preamplifier has been designed to incorporate the advances made with the Series 2 upgrade to our flagship GAT into a more affordable model.

An audio amplifier stage consisting of a single-ended triode amplifier provides the voltage gain. This amplifier stage is connected to the preamplifier outputs through a high-current MOSFET buffer, which achieves a very low output impedance, making the ET7 extremely flexible in the choice of interconnect cables and amplifiers. DC voltage is supplied to the circuit by the revised discrete voltage regulator developed for the GAT Series 2. It isolates the audio circuit from the power line by maintaining negligible impedance across the audio frequency band.

ConradJohnson ET3

ET3/ET3SE Vacuum Tube Preamplifiers

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. 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. Those who wish to take the performance to yet a higher level will be thrilled by the availability of an upgraded “SE” version. The ET3SE boasts CJD Teflon capacitors in critical circuit applications, upgraded metal foil resistors, upgraded machined input/output connectors, and even an upgrade AC mains line-cord.