Tube based external phono preamplifiers are the preference of music lovers who prefer the sonic virtues of analogue reproduction. Modern MC (moving coil) pickup systems, with their low output signal, cannot be connected to a tube based phono stage without an additional step up transformer to keep the total noise to an acceptable level. When OCTAVE was founded, Andreas Hofmann began developing phonostage preamplifiers with an electronic MC input, because transformers are very sensitive to magnetic stray fields and they are limited in respect of the load impedance and the amplification factor.

The OCTAVE Phono Module is a full feature phone preamplifier which allows the use of three different Input modules and three different Output modules. The three Input modules can be used simultaneously. There is a single-ended (RCA) MM (moving magnet) module, with switchable Input Impedance 1k Ohm and 47k Ohm. There is a single-ended (RCA) MC module featuring switchable Input Impedance between 50 to 500 Ohm, with Gain adjustable in three steps. There is a balanced MC Module with XLR input jacks, featuring the same Impedance and Gain adjustment as in the unbalanced MC module.

The Phono RIAA equalization stage is realized with a tube circuit based on the phono section of the highly-regarded OCTAVE HP 500 SE preamplifier. The RIAA Stage utilizes three tubes to ensure the high gain required by the RIAA correction. The specific configuration, with solid-state devices in the MC input and tubes in the RIAA output stage, allows the realization of a phono preamplifier which surpasses any and all tube designs in respect to spectral clarity and the signal to noise ratio.

The optional Output modules complete the OCTAVE Phono Module: There is the standard single-ended Output Module featuring dual RCA outputs, one with fixed level, the other with passive regulation. The next is the single-ended “ Direct Drive “ Module, also with dual RCA outputs, where the regulated output is buffered to reach a low output resistance to allow for driving a power amplifier directly. There is also the Balanced (XLR) “Direct Drive” Module, featuring complex circuitry containing a tube and some integrated circuits that form a perfect balanced converter. This regulated output is also able to drive any power amplifier directly, while also allowing the level of the balanced output to be reduced to operate with the balanced line level inputs of a preamplifier. The OCTAVE Phono Module utilizes an external power supply.


Technical Data:


Power Supply 70 x 100 x 260 (WxHxD)
Subsonic Filter 15Hz / -3dB / 12 dB / Oct
THD + Noise < 0.1%, 20Hz – 20kHz
Output Level 7V RMS
Output Resistance 300 Ohm / fix + variable
Input Resistance 60 – 1000 Ohm / MC
Input Sensitivity < 0.1 mV / MC
Dimensions Phono Module 435 x 65 x 390 mm (WxHxD)
“External Power Supply for Phono Module”

OUT 1 2 x RCA Standard

OUT 2 2 x RCA Direct Drive

OUT 3 2 XLR Direct Drive

IN 1 RCA MM input module

IN 2 RCA MC input module

IN 3 XLR MC input module

IN 4 XLR / RCA input module switchable

IN 6 RCA MC transformer input module

IN 7 XLR MC transformer input module

IN 8 XLR Line transformer input module