video_b1.pngGURUS AMPS Are the Italian creators of award winning pedals like Echosex 2° and the 1959 DoubleDecker. We want to continue making some of best used machines of the past available today to musician. Our product creations will have some new added features to make it current and help todays musicians be more creative.

The OPTIVALVE Tube-Optical Compressor Pedal is the last word in Compressor Pedals with all the advantages of the legendary Studio Outboards that have made history in music, but more versatile and easier to use.

Use it in different ways as a studio outboard, or on your pedalboard.
As a standard compressor pedal to bring out  the tone suitable in various styles: funky, blues, rock, etc.
Use as a Limiter, to obtain maximum clean volume from your Amp without adding crunch it, or as an incredible enhancer of your TONE.

Use the “See thru Magic EYE” to view the Compression reduction level. Use it with your Guitar, Bass, Keyboard, Acoustic Guitar, or as real outboard for your mixing tracks.


General Details:

Power In 9 – 12 VDC max.
Consumption (normal conditions) Max 230 mA
Max Consumption Peak at start (tube warm up) <1A
Gain reduction Up to 40db
Input Impedance <1M Ohm
Input Level 1 Vpp max.
Distortion <0,28% @+24db
Output Impedance <100K Ohm
Output Level +22db / +28db peaks
Frequency Response 20Hz – 20.000Hz +/- 0,8db
Tone filter – 6db @4500Hz.
Magic Eye Meter db Gain Reduction
Signal Noise ratio <80db @max limiting value
Tube type 12AU7/ECC82
Width 165mm.
Length 125mm.
Height 35mm.
Weight 0,6Kg.

Block Diagram

Gain Reduction Analys

Scope Analysis


Use this setting with the Optivalve in your pedalboard to give you the maximum headroom available by your amp without crunch it’s input.

Optivalve will enhance your soft touch, and limiting when you attack notes harder.


Slightly open the Tone control to perfectly match the tone of your acoustic guitar, even with higher compression values. The Ratio control can be used fine tune how much you want the Optivalve to affect the dynamics of your signal.

This setting maybe used in mix insert or on the stage “Live” to achieve the desired tone from your acoustic guitar.


With this setting, you can obtain a natural compression that level strings volume and attack.

Set the Tone control to better fit different playing techniques. Slightly open it for slap or pick use.


Optivalve can be used as a standard outboard effect on your mix for any instruments. With this setting you can use as a Limiter. Use tone control to better fit the output sound.

In this case, the Input Knob has the Threshold role, use it to set the point where Optivalve starts to limit peaks.




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