ET7-II

About the ET7-II

The ET7-II (also referred to by some dealers as ET7-S2) is a single-ended tube linestage preamplifier from Conrad-Johnson using a single 6922 double triode operated as a single-ended triode per channel for voltage gain, followed by a high-current MOSFET buffer stage to achieve very low output impedance. The regulated power supply and audio circuit topology are derived from the company's flagship GAT Series 2, with all audio-circuit and DC-supply capacitors implemented in Teflon or polypropylene (no electrolytics in the audio circuits or their supplies). Tube heaters are powered from a separately regulated DC supply to minimize infra-sonic noise. Input selection and level control are implemented by microprocessor-controlled relays driving a network of high-precision laser-trimmed metal-foil resistors, providing 100 volume steps of about 0.7 dB each, controllable from the front panel or remote. The ET7-II provides five single-ended RCA line inputs and two single-ended processor loops, with one loop offering a theater-pass-through unity-gain mode. Construction uses Conrad-Johnson's CJD Teflon output coupling capacitors, metal-foil resistors in critical locations, sealed relays with gold-plated silver contacts, and gold-plated oxygen-free copper RCA connectors. The chassis measures 19" W x 15.375" D x 4.375" H and weighs 19 lb. The ET7-II is widely characterized by reviewers as offering a natural, highly resolving, and tonally organic presentation with a wide soundstage.