Demonstrations By Appointment
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The Reference 750 SE is prepared to deliver 750 watts of power into speaker loads of 4, 8 and 16 ohms. This is achieved by the use of a massive, custom- built power transformer delivering current from sixteen KT150 vacuum tubes. Thanks to extensive testing and strict selection of tubes, the amplifier requires little maintenance and obviates the need for costly and sonically deleterious automatic bias systems. Power supply regulation is also achieved by 6550WE and 6H30 vacuum tubes. Tube bias is controlled by two KT150 tubes, each driving a bank of eight tubes.
POWER BANDWIDTH
(-3dB points) 15Hz to 150kHz.
FREQUENCY RESPONSE
(-3dB points at 1 watt) 1 Hz to 200 kHz.
INPUT SENSITIVITY
4.6V RMS Balanced for rated output. (24 dB gain into 8 ohms.)
INPUT IMPEDANCE
200K ohms Balanced.
OUTPUT TAPS
4, 8, 16 ohms.
OUTPUT REGULATION
Approximately 0.5dB 16 ohm load to open circuit (Damping factor approximately 17).
OVERALL NEGATIVE FEEDBACK
13dB.
RISE TIME
1.5 microseconds.
HUM & NOISE
Less than 0.2mV RMS – 110dB below rated output (IHF-A weighted, input shorted, 16 ohm output).
POWER SUPPLY ENERGY STORAGE
Approximately 1300 joules.
POWER REQUIREMENTS
105-130VAC 60Hz (200-270VAC 50Hz) 2100 watts at rated output, 2400 watts maximum, 800 watts at "idle".
TUBES REQUIRED
8 Matched pair KT150 Power Output; 1 6550WE Regulator; 1 6H30 Regulator Amplifier; 1 matched pair KT150 Driver; 1 6H30 follower.
DIMENSIONS
13.5" (34.3 cm) W x 23" (58.4 cm) H x 20.8" (52.8 cm) D. Handles extend 1.5" (3.8 cm) forward and rearward.
WEIGHT
170 lbs. (77.2 kg) Net; 395 lbs. (180 kg) per pair shipped weight.