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Octave HP 500 SE Tube Preamplifier

For over 20 years, this preamplifier has been the epitome for consistent excellence in sound quality and state-of-the-art tube technology.During this time, it has maintained its market-leading position thanks to regular design updates from OCTAVE. OCTAVE recently developed the SE (Special Edition) version to mark the 25th anniversary of Stereoplay magazine, which first tested the original HP 500 in 1989. The SE brings the HP 500 preamp back to the current state-of-the-art once more. RETAIL: $9,800 w/ phonostage


In – and Outputs

The HP 500 SE features a total of six single-ended (RCA) inputs. Outputs included are one RCA Record output, two pair of RCA and one pair of balanced (XLR) outputs. The balanced (XLR) output is transformer coupled to provide ground isolation and perfectly phase-inverted signals with no group delay.

Tape Monitor

The Tape Play and Record input section is connected in the classic manner which allows monitoring of the signal, which is recorded at the same time. The Record output is buffered to minimize interaction with any type of recording equipment.

Power Management and Protection System

The preamplifier is equipped with a multistage Turn-On/Soft-Start electronic protection circuit to avoid stress caused by high inrush currents during the turn on phase. The unit powers up in a defined sequence, and during warm-up the output of the HP 500 SE is shorted to ground. The same occurs when the unit is switched off. This avoids unwanted signals being passed to the power amplifier. The lifetime of the tubes are extended considerably while their sound quality remains stable for many years due to this protective measure.

Optional Phono Stage

The optional internal Phono Stage always includes two independent inputs: one for MM (moving magnet) and one for MC (moving coil) cartridges. The selector for the inputs is in the rear front. A second selector activates the subsonic filter. Listening to older analogue records is recommended with a subsonic filter to avoid infrasonic signals.

The Input Impedance of the MM input is 47 k Ohm; the MC Input is adjustable between 37 to 500 Ohms. Gain of the MC Section is 80dB.



Gain High 17,5 dB = 7,5

Gain Low 9,5 dB = 3

Frequency Response 3 Hz - 500 kHz 1,5 dB

Signal-to-Noise Ratio : Gain High - 92 dB

Signal-to-Noise Ratio Gain Low -103 dB

Left/Right Crosstalk 65 dB 1 kHz

Input to Input Crosstalk - 86 dB 10 kHz

Input Impedance 100 kOhm

Output Impedance 100 Ohm (Cinch); 2 x 50 Ohm XLR

Channel Balance 0.5 dB - 70 dB


Input Impedance 47 kOhm || 130 pF

Input Sensitivity 3 mV

RIAA-Equalization Accuracy 0,3 dB 15 Hz - 20 kHz

Gain 40 dB 1 kHz

Signal-to-Noise Ratio (weighted) - 73 dB

Corner Frequency Subsonic-Filter 20 Hz / - 3 dB


Input Impedance 37-500 Ohm

Input Sensitivity 0,1 mV

Gain 30 dB

Signal-to-Noise Ratio (weighted) - 75 dB

Inputs : 5 x Cinch, 2 x Phono Option (MM/MC)

Outputs : 2 x Cinch, 1 x XLR, 1 x Rec

HT Bypass Option, Sym. Outputs, Phono MM/MC Option

Power Consumption 50 W

Weight Preamp 10 kg

Weight Power Supply 4 kg

Dimensions Power Supply 18 x 10 x 28 cm (W x H x D)

Standard Accessories Power cord, IR-Remote Control