HP 500 SE




Technical Data:


OCTAVE recently developed the SE (Special Edition) version to make the 25th anniversary of Stereoplay magazine, which first tested the original HP500 in 1989. The SE bring the HP 500 preamp back to the current state-of the-art once more.The use of two Siemens D3A (EF 184) pentodes provides the output stage of the HP 500 SE with a significantly greater band-width (0.2Hz to 2.3 MHz, 6 dB). The extremely low cut-off frequency is responsible for the clear and more tightly defined bass, which provides the foundation for a clean low frequency register and a thrilling midrange performance.OCTAVE has also further refined the outboard power supply. MOSFET transistors regulate the high-voltage supply. Increased reservoir capacity, improved rectification with Schottky diodes, and end-to-end electronic stabilization all ensure a virtually noise-free supply voltage with a noise component of less than 300uV. These measures contribute to the exceptionally high signal to noise ratio of 103 dB.Our perennial preamplifier, the HP 500, has been around for almost as long as OCTAVE and was in many ways responsible for defining our approach to building amplifiers. 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.

Line stage
Frequency response 3Hz - 500kHz / 1.5dB
Signal to noise ratio -92dB (Gain High) / -103dB (Gain Low)
Output impedance 100 Ohms RCA / 2 x 50 Ohms XLR
Total Harmonic Distortion 0.001% @ 3V / 7.5 kOhm
Phono MM
Input impedance 47 kOhm / 130 pF
Signal to noise ratio -73 dB
Phono MC
Input impedance 37 – 500 Ohms
Signal to noise ratio -75 dB
Dimension 435 x 147 x 393 mm (WxHxD)
Dimension (Power Supply) 180 x 100 x 280 mm (WxHxD)
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