The original 150 SE not an upgraded one. I am the original owner bought October 2019, 2 years and 2 months left on the parts/labor warranty. I have the original boxes, manual and paperwork. This is really a great sounding amp with detail and bass slam. Simply put, the REF150 SE is a breakthrough in stereo power amplification. Replacing the REF150—which was one of the most respected modern stereo amplifiers—was a daunting task, but it has been accomplished. The REF150 SE offers more power, greater dynamic thrust, a more vivid and resolved presentation, greater finesse, and quieter operation. The REF150 SE is a fully-balanced design. It has a 20-amp IEC power connector, 4-8-16 ohm output taps and 12V triggers arrayed on the rear panel
First, power-supply energy storage has been doubled to some 1040 joules. All-new interstage coupling capacitors using technology and materials first incorporated in our Anniversary Edition preamplifier effortlessly link input stage to output stage, which is powered by two matched quads of Russian KT150 output tubes driven by 6H30 twin triodes.
Larger, wide-bandwidth output transformers handle the greater output with ease. Power output is rated at 150 WPC into 4-, 8- or 16-ohm speaker loads. Each channel is very quietly fan-cooled using new low-turbulence intakes, with three selectable fan speeds. Internally there is a small LCD display that indicates tube hours.
POWER OUTPUT: 150 watts per channel continuous from20Hz to 20kHz. 1kHz total harmonic distortion typically 0.6% at 150 watts, below 0.03% at 1 watt. Approximate actual power available at 'clipping' 160 watts (1kHz).
POWER BANDWIDTH: (-3dB points) 5Hz to 80kHz.
FREQUENCY RESPONSE: (-3dB points at 1 watt) 0.5Hz to 120 kHz.
INPUT SENSITIVITY: 2.0V RMS BAL for rated output. (24 dB Bal gain into 8 ohms.)
INPUT IMPEDANCE: 300K ohms Balanced.
OUTPUT POLARITY: Non-inverting. Balanced input pin 2+ (IEC-268).
OUTPUT TAPS: 16 ohms, 8 ohms, 4 ohms.
OUTPUT REGULATION: Approximately 0.6dB 16 ohm load to open circuit (Damping factor approximately 14).
OVERALL NEGATIVE FEEDBACK: 14dB.
SLEW RATE: 13 volts/microsecond.
RISE TIME: 2.0 microseconds.
HUM & NOISE: Less than 0.1mV RMS – 114dB below rated output
POWER SUPPLY ENERGY STORAGE: Approximately 1040 joules.
POWER REQUIREMENTS: 105-125VAC 60Hz (210-250VAC 50Hz) 730 watts at rated output, 900 watts maximum, 420 watts idle.
TUBES REQUIRED: 2 – Matched quad KT150 – Power Output; 4 – 6H30 Driver.
DIMENSIONS: 19"(48.3cm) W x 83⁄4" (22.2cm) H x 191⁄2" (49.5cm) D. Handlesextend 11⁄2" (3.8cm) forward.
WEIGHT: 75lbs. (34.2kg) Net; 90lbs.
PS: HRS Damping plate seen in one pic is not included in sale.