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Octave HP700 Preamplifier
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Octave HP700 Preamplifier
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HP700 | The Next Step
HP700 - sophisticated valve technology combined with intelligent modularity make this pre-amp future-proof. A valve pre-amp boasting innovative precision technology and a modular concept that allows the listener the freedom to build a system to cater for individual music tastes. Instead of being bound by the fixed audio and technical parameters of the equipment, listeners can adapt the technology of the HP700 to their own requirements and preferences. The result is THE sound - the optimal sound experience for the individual high-end audio system and the individual listener. THE NEXT STEP - A major step toward the ideal of all music lovers.
PRECISION TECHNOLOGY IN THE LINE STAGE
Three amplification settings, combined with selectable output impedance, enable perfect fine-tuning of the HP 700 to the characteristics of the sound reproduction chain. The three-stage amplification settings allow optimal matching of the volume control to the efficiency of the speaker. The ability to select the output impedance – and therefore the output current – facilitates optimal set-up of the unit for the cable properties, cable length and cable capacity as well as for the input sensitivity of the output stage.
In combination with the newly developed high-precision, low-noise supply-voltage stabilizing circuitry, the separate power supply unit for the HP 700 ensures constancy of the audio output even when the mains voltage is subject to wide fluctuations and high interference levels. Added to this, the integrated control logic system guarantees maximum operational reliability and, backed by our exclusive soft-start technologies, ensures the valves and the unit have a life of up to twenty years.
The multi-channel bypass function allows the HP700 to be integrated into an existing home-theater combination. The logic-controlled input selector circuitry allows selection of the bypass function for an XLR or phono input on the rear panel. The HT signal is present at all three outputs.
EXTERNAL POWER SUPPLY UNIT
The sophisticated design of the HP 700 makes extremely high demands on the power supply unit. The external power supply unit is magnetically screened and supplies a clean voltage to the HP 700. The screening is also essential to ensure low- noise, low-hum operation of the phono MC input.
ADDITIONAL INDIVIDUALIZATION OPTIONS:
The connection possibilities of the generously configured standard model are rounded off by two user-selectable optional input modules. An optimized input module can be used for unusual applications, for anything from an MC step-up transformer to a transformer-based XLR input module. The plug and play modules can be readily installed or upgraded at any time.
Next-step technology has also been applied in the redesign of the Phono RIAA amplifier. The further development of the RIAA stage has improved the signal/noise ratio, while simultaneously reducing system-related distortion. The widening of the bandwidth enables accurate RIAA equalization and exploits the full potential of analog reproduction. The wide variety of optional input modules ensures that the optimal input can be installed for every pickup.
TONE CONTROL PRECISON TONE CONTROL
The innovative optional tone control rounds off the HP 700 equipment. The precision valve-based tone control unit guarantees consistency of the sound, even at low volume. Precision adjustment of bass and treble, with a 0.3dB channel separation, allows the tone to be adjusted without impairing the spatial reproduction.
The frequency-compensated balance control allows channel-separated volume adjustment in 1 dB steps. This technology eliminates any controller-related sound shifts. Using 12-position stepped switches, the setting is longtime stable, with 100% repeatability.
OUTPUT SELECTOR SWITCH
The unit output can be switched to several zones by manual activation of the outputs. Whether the output is through XLR, phono or all three outputs simultaneously, a total of three output stages can be utilized for separate rooms, different speakers or bi and tri-amping.
STEPPED VOLUME CONTROL
The optional, frequency-compensated 47-position stepped switch ends the debate about the influence of the controller on the quality of the music signal. At 0.1dB, the channel deviation is supreme. Our own in-house development, the volume control design maintains the frequency bandwidth constant throughout the entire control range, reducing controller-related distortion to a scarcely measurable level.
However, as a result of the mechanical design of the stepped attenuator, the switch positions cannot be controlled using the remote control.
- Basic Model HP 700
- Design luminium silver or Aluminium black
In- and outputs
3 x RCA, 2 x XLR, 2 x arbitrary
1 x Bypass RCA (can be switched to IN4 -XLR)
Outputs 2 x RCA, 1 x XLR, 1 x Monitor / Tape Record (RCA)
XLR transmission ratio 0 dB
XLR pin assignment 1 = ground, 2 = positive, 3 = negative
Output resistance 100 / 300 ohms RCA; 150 ohm XLR
Monitor Out output resistance 240 ohms
Maximum output voltage 12V
Gain factor Gain High 25 dB = 18,5
Gain factor Gain Med 18 dB = 7,8
Gain factor Gain Low 12 dB = 4
Signal-to-noise ratio Gain High - 98 dB / 38 µV at 3 V output voltage
Signal-to-noise ratio Gain Med - 104 dB / 18µV at 3 V output voltage
Signal-to-noise ratio Gain Low - 110 dB / 8 µV at 3 V output voltage
Equivalent noise-level 14 nV √Hz
Frequency response Gain High-RCA 10 Hz – 200 kHz -0,7 dB, 0,7 Mhz -6 dB
Frequency response Gain Med-RCA 10 Hz – 200 kHz -0,3 dB, 1.3 MHz -6 dB
Frequency response Gain Low-RCA 10 Hz – 200 kHz -0,2 dB, 2,1 MHz -6 dB
Frequency response XLR 10 Hz – 200 kHz -1,5 dB
Ramp-up time Gain Low 250 ns
Ramp-up time Gain Low 60 V/µs
Total harmonic distortion, Gain Low, Med, High 0.01% at 3V on 10 kOhm
Channel separation -90 dB / 1 kHz, Input short-circuited
Crosstalk between inputs - 80 dB / RCA, -95 dB XLR / 1kHz
Input resistance 50 kOhm
Channel matching via volume control 0,5 dB - 70 dB
RIAA equalization tolerance 0,3 dB / 15 Hz - 20 kHz
Corner frequency - subsonic filter 15 Hz / - 3 dB
Signal-to-noise ratio - 75 / - 84 dB / with IN 2 MC Input
Input sensitivity 250 µV / 600 µV / with IN 2 MC Input
Input sensitivity, gain and input resistance depend on input module
Gain MC Gain Low - Pre Out Gain Low: 70 dB, Med: 77 dB, High: 83 dB
Gain MC Gain High- Pre Out Gain Low: 79 dB, Med: 86 dB, High: 92 dB
35 - 60 W
Weight preamplifier 10 kg
Weight power supply 3,8 kg
Supplied accessories Power calbe, remote control
Dimensions of preamplifier (over-all) 462 x 130 x 480 mm (W x H x D)
Dimensions of power supply (over-all) 110 x 90 x 277 mm (W x H x D)
Dimensions (in mm)
» The HP 700 is equipped with two RCA and XLR outputs.
» The XLR output is transformer balanced and galvanically isolated.
» Soft start for heating, power supply and signal output; providing maximum tube life and trouble-free switching on and off.
» The gain of the Line-stage can be switched in three levels.
» External power supply with multiple shielded power transformer and integrated mains filter.
Frequency response and gain of line stages in Gain Low (12 dB), Med (18 dB), and High (25.5 dB) settings.
Line stage hum and noise level:
No mains interference can be detected during noise level measurement either; the noise level decreases linearly by 6 dB for each gain setting.
FFT interference spectrum:
Comparison of the RCA and XLR interference spectrum. No mains interference on either of the inputs; the spectrum of the harmonics K2, K3, K4, K5, K6 decreases consistently linearly for both outputs.
Phono frequency response with and without subsonic filter:
The frequency range without subsonic filter is very linear and extremely low (red graph). With the subsonic filter (cyan graph), bass reproduction is not limited by the low corner frequency (-3 dB at 15 Hz).
Control characteristics of the tone control:
The control range encompasses the area between the red and blue graphs. The precisely adjustable controls allow for settings in the 1 dB range based on the scale. One scale mark corresponds to +/- 4 dB.
Control range and balance control frequency response:
The compensated balance pre-control exhibits virtually the same frequency response with all settings.
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