Stingray (Version 1.5). This is the post-2005 version with the RECORD output, subwoofer outs, TAPE LOOP, and the TRIODE/ULTRA-LINEAR switches.
The EL84 output stage can be switched between either around 20 watts of TRIODE or 40 watts of Ultra Linear mode push-pull operation. Individual bias for each tube is easily adjusted using the trimpots and test points, conveniently located on the top surface of the amplifier.
The Operating Mains Voltage has been upgraded with power transformer re-wiring on PCB and fuse value change compliments of Eva Manley. This upgrade allows the included Soviet era, military grade output tubes to operate at peak performance. All tubes were recently installed NOS and are lightly used. The tubes included are the best I've found for this unit. However, I do have a number of NOS/Old Stock EL-84 tubes and NOS 6414's that could be included at additional price for your tube rolling pleasure.
Features and Specifications:
4 x Stereo Line RCA Inputs TRIODE - UL Switching RECORDING OUT SUBWOOFER OUT TAPE LOOP (Insert) with Bypass switch Passive Noble Volume and Balance Controls All-Vacuum Tube Lo-feedback Stereo Integrated Design Output Tubes: 8 Russian EL84M (aka 6Pi14Pi-EB) 1984 Driver Tubes: 2 x 6414 USA RAYTHEON Triple Mica, "D" Getter 1982 Input Tubes: 2 x ECC 801 s German Siemens Military Grade Maximum Output Power UL mode: 40 Watts x 2 channels 1.5% THD @ 1kHz Maximum Output Power TRIODE mode: 20 Watts x 2 channels Frequency Response: 15 Hz - 40 kHz, -1dB Gain: 37 dB at max Volume Input Sensitivity: 185 mV in = 50 watts out into 5 Ohms Input Sensitivity Triode: 66mV in = 1W into 8 Ohms Input Sensitivity UL: 53mV in = 1W into 8 Ohms S/N Ratio: typically 87 dB A-WGT, 20Hz-20KHz Input Impedance: 50 kOhm nominal Optimum Speaker Load: 5 Ohms Actual Output Impedance at 20Hz: 2.8 Ohms at 100Hz: 2.6 Ohms at 1KHz: 2 Ohms Damping Factor: 5 Power Consumption Idle: 200W
Maximum Power Consumption at Full Power: 370W