Octave · Preamplifiers
HP 700 SE
The HP 700 SE is a modular tube preamplifier with a Class A output stage, taking plug-in input modules for phono or line-level sources and dual XLR/RCA outputs for bi-amping.
fig. 01 · preamplifiers
HP 700 SE
current
8 photographs · 5 shown
From Octave
The HP 700 SE uses an ECC82 and two EF800 tubes in its line stage, with a separate Phono RIAA board running ECC83, ECC81, and ECC88 tubes when installed. Its precision circuit spans a bandwidth to 1MHz, holds output resistance to 100 ohms, and measures 0.001% distortion.
Three selectable gain stages, 12dB Low, 18dB Med, and 25.5dB High, let you match the preamp's output to your amplifier's sensitivity. A magnetically shielded outboard power supply keeps the MC phono input quiet, and a logic-controlled input selector adds a multi-channel bypass for home theater integration.
The rear panel carries 3 RCA inputs, 2 XLR inputs, 2 freely selectable module slots, and an HT bypass input, alongside 2 RCA outputs, 1 XLR output, and a monitor/tape output. Optional additions include phono MC and MM input modules, a valve-based tone control unit, and a 47-position stepped attenuator for the volume control.
Specifications
| Basic model | HP 700 SE Line |
|---|---|
| Options | Phono RIAA unit, 8 input modules, 47-pin step switch for volume, control unit |
| Design | Silver or Black |
| Tube complement | Line: ECC82, 2 x EF800; Phono: ECC83, ECC81, ECC88; Control modul: ECC88 |
| Inputs | 3 x RCA, 2 x XLR, 2 x free selectable, 1 x Bypass RCA |
| Outputs | 2 x RCA, 1 x XLR, 1 x monitor / tape record (RCA) |
| Dimensions Preamplifier / Power Supply | 462 x 130 x 480 mm / 110 x 90 x 277 mm (W x H x D) |
| Weight Preamplifier / Power Supply | 10.0 kg / 3.8 kg |
| Soft start control electronics | Providing maximum tube life and trouble-free switching on and off |
| 3 levels of amplification can be selected | Adaptation to the efficiency of the speaker |
| XLR outputs with transformers | Prevent hum disturbances |
| Freely selectable inputs | By modular technology |
| Option Control Modul | Tone and balance control, output selector switch |
| HT Bypass (optional) | Bypass-function for multichannel/home cinema |
| Two parallel XLR outputs | for Bi-Amping |
| Gain factor | High: 25 dB = 18.5 / Med: 18 dB = 7.8 / Low: 12 dB = 4 |
| Frequency response | High: 10 Hz - 200 kHz -0.7 dB / Med: 10 Hz - 200 kHz -0.3 dB / Low: 10 Hz - 200 kHz -0.2 dB |
| Total harmonic distortion | 0.01% at 3V on 10 kOhm |
| Signal-to-noise ratio | High: -98 dB / 38 µV; Med: -104 dB / 18 µV; Low: -110 dB / 8 µV |