Octave Audio V70 ClassA
Octave Audio V70 ClassA valve integrated amplifier, push-pull circuit operating in class A combining KT120 tubes and a triode input stage.
Description
The V70 ClassA is a valve integrated amplifier from Octave Audio, built around a push-pull circuit operating in class A. It drives a pair of speakers directly without a separate power stage and offers an optional phono input as well as an adjustable Pre-Out output for pairing with a subwoofer or another element of the system.
Operation in class A limits total harmonic distortion to less than 0.1% at 10 W into 4 Ohms, a level that translates into a particularly clean sound reproduction in the midrange. Output power reaches 2 x 70 Watts peak into 4 Ohms, with a frequency response from 20 Hz to 70 kHz measured at 50 W. The input stage is built around one ECC83 and two ECC81, while the power stage uses four KT120 tubes, a choice that combines the tonal smoothness of class A with a more generous power reserve than traditional class A amplifiers.
Connectivity includes five RCA inputs, one XLR input, an RCA bypass, a Rec Out output and an adjustable Pre-Out output, complemented by an optional MM or MC phono card. This level of equipment suits a hi-fi system built around speakers with a sensitivity suited to an optimal impedance load of between 4 and 16 Ohms, for a listener seeking the texture typical of valve amplifiers without giving up sufficient dynamics.
Technical specifications
| Output power | 2 x 70 W peak into 4 Ohms |
| Frequency response | 20 Hz - 70 kHz @ 50 W -1/-3 dB |
| Total harmonic distortion | < 0.1% @ 10 W into 4 Ohm |
| Signal to noise ratio | -100 dB / 50 W |
| Optimal impedance load | 4 - 16 Ohms |
| Damping factor | 5 @ 8 Ohms |
| Input sensitivity | 300 mV RCA |
| Input impedance | 50 kOhm / RCA, 25 kOhm / XLR |
| Left/right crosstalk | 55 dB |
| Crosstalk between inputs | -105 dB |
| Pre Out output impedance | 240 Ohm |
| Maximum Pre Out level | 5 V RMS |
| Gain | 35 dB |
| Input tubes | 1 x ECC 83, 2 x ECC 81 |
| Power tubes | 4 x KT120 |
| Dimensions (H × W × D) | 175 x 451 x 405 mm |
| Weight | 23 kg |
What to check before buying used
On a valve amplifier of this type, the condition of the four KT120 tubes and the ECC83/ECC81 input tubes directly affects the sound and warrants a check before returning it to service, as does their matching across the power stages. The bias current setting, specific to class A operation, should be checked to preserve the stated linearity. The power supply capacitors and the tube sockets (contacts, micro-vibrations) are also sensitive points on this kind of circuit pushed into class A.
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