Vintage oil can echo devices are electromechanical units that write a static charge onto a rotating disk housed in a can partially filled with oil. The oil serves as a lubricant that helps retain the charge on the disk. The resultant delay signal is very band limited, creating a murky sounding echo. But that’s not the only quality that gives the oil can echo its atmospheric magic.

The units have a record head and typically two playback heads, but generally no erase head, allowing some dissipating charge to remain as the can rotates. This contributes to two unique characteristics of these systems.

First, it creates a regenerating repeat even when no feedback (REGEN) is applied from the playback heads. The static charge has its own decay time constant, so there are always “repeats” from the echo at all settings.

Second, it creates an uneven cadence to the echoes, where the first echo occurs based on the distance from the record head to the playback head. But subsequent echoes occur at the rotational speed of the system as the dissipating signal comes back around on the disk. The resultant off-kilter delay cadence is largely responsible for creating the sense of atmosphere without a strong “rhythmic” element.

By adding feedback (REGEN) from the playback heads, and/or combining the output of the two heads, the atmospheric nature of the echoes increases.

The Time knob determines the delay time for the repeats by adjusting the rotational speed of the oil can. Some vintage units had a fixed speed, but we’ve allowed the rotational speed to vary between roughly 200ms to 800ms in total delay time, which can be further modified by the Head selection switch.

Short Head delay time: 72ms – 290ms

Long Head delay time: 155ms – 620ms

Disc Rotation, 200ms – 800ms (residual static repeats)

Heads Control: Vintage oil can echo units had a single record head and two playback heads. The playback head’s distance from the record head determined the decay time of the echo, and you can choose from ‘Short’, ‘Long’ or ‘Both’ with this switch. The ‘Short’ setting selects the head that is the closest to the Record head for the shortest echo, and the ‘Long’ setting selects the head that is the farthest away from the Record Head for the longest echo. The ‘Both’ setting enables both heads at the same time, giving the repeats a lopsided and complex scenario.

Mix: This control determines the mix of the wet and dry signal, with a 50/50 mix of wet and dry occurring at roughly 3 o’clock on the knob.

Rate: Controls the speed of the modulation.

Intensity: Controls the intensity of the modulation, where the modulation becomes much more prominent in the audio mix the higher the position of the knob.

Regeneration: This control was often labeled “reverb” on vintage units, and it controls the amount of echo repeats that are fed back into the can to be reprocessed.

Higher settings of the knob create a reverberant and atmospheric character, which many would say is one of the signature elements to the sonic character of an oil can echo.

NOTE: Hold the footswitch while turning the Regeneration knob to adjust the tone of the repeats. Noon on the knob is the character that we captured from our reference units, with lower settings being darker, and higher settings brightening the repeats.

Infinity Mode: Use a Strymon MiniSwitch to engage continuous repeats — just like turning the Regeneration knob to maximum — for endless, evolving echoes.

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