ART88 All tube audio stage preamp Gain 24db , output impedance 190 ohms Independent L/R power supplies 2 x PCC88 dual triodes each channel in parallel Independent L/R audio boards on 4-shock mounts CARDAS I/O RCA jacks	ET7 S2 "Gain: 25 db Maximum output: 20 vrms Output impedance: 100 ohms Frequency response: 2 Hz to more than 100Khz Tube complement: 1 x 6922"
ET6 "1 x 6922 tube optional phono stage 25 db gain 20 Vrms Maximum output 2 Hz to more than 100Khz frequency response"	ET6 SE "boasts CJD Teflon capacitors and metal foil resistors in critical circuit applications 1 x 6922 tube optional phono stage 25 db gain 20 Vrms Maximum output 2 Hz to more than 100Khz frequency response"