Corvo – Handcrafted Labs – Opto-Tube balanced parallel compressor


  • Opto-Tube compressor
  • Push-pull design with four tubes per channel
  • Parallel compression


Corvo is an opto-tube balanced compressor with parallel compression and expanded controls by Handcrafted Labs.


It is built incorporating push-pull design with four 6п1п tetrode tubes per channel (2 for wet channel, 2 for dry channel) making 8 tubes in total. Compression is managed via opto-pair, much like in our Solution compressor, but in Corvo you get timing controls for attack and release parameters with x2 multiplier switch, ratio knob, Threshold knob, Feedback/Feedforward switch, Sidechain low-cut at 75Hz and two signal path knobs Wet and Dry. All knobs are stepped. Unit operates in dual-mono mode as well as linked stereo mode, for which there’s a button on a faceplate. There’s also a true bypass circuitry with a switch for each channel. Add input/output transformers from world best manufacturers and you get a versatile and lovely sounding compressor for multiple studio applications, be it tracking, mixing or mastering.

Parallel compression is Corvo’s most unique feature, where you get way more flexibility sound-wise. Wet channel can still be used as a straight forward compressor if you wish to, but adding a Dry level makes all the difference, enabling parallel compression chain. You then can go way more extreme with compression, compensating for the lack of transients with Dry channel making overall sound more distinct, manageable and robust. And you can still use a Dry channel just as a way to enrich your signal with sound of transformers and tubes it goes through.


Corvo Technical Specifications


  • Input Impedance – 600 Оhm Output Impedance – 600 Оhm
  • Nominal Level + 4 dBu
  • Max. Level + 22 dBu
  • Max. Amplification 6 dBu
  • Output circuit pentode/triode (switch)
  • Compressor Side chain Filter 75/150 Hz


Compressor Timings

  • Attack 0.2 ….20 ms
  • Attack Х2 (mult. switch) 0.4….40 ms
  • Release 100ms….1s
  • Release Х2 (mult. switch) 200ms….2 s
  • Frequency range 16Hz … 22 kHz +/- 1dB
  • Signal to noise ratio – 88 dB
  • THD at 1kHz and +16 dB less then 1.5 %
  • Power Supply 115/230V 50-60Hz