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BLACK FINGER

All-tube Optical Compressor

- OPERATING INSTUCTION- S

Congratulations on your purchase of the Black Finger! The Black Finger is a warm

sounding compressor pedal useful for both guitar and bass, as well as for home

recording. This pedal features an all-tube signal path using two premium 12AX7EH

vacuum tubes. Carefully reading these instructions will ensure that you will get the

most out of your Black Finger.

Included with the Black Finger is a unique 12VAC/1000mA adapter. Use only the

adapter supplied. Using any other adapter can cause harm to you, the Black Finger

and the adapter.

- THEORY OF OPERATION -

Optical compressors work by treating an incoming signal with an optically controlled

attenuator (a type of volume control) comprised of a fixed resistor and a shunt opto-

coupled photocell. Because this attenuator is “passive”—as opposed to the more

common “active” AGC (Automatic Gain Control) compressor circuits—it doesn’t add

an electronic signature to the signal, thus preserving the tone and character of the

original sound. Some gain is needed to adjust the output level so that it matches the

original level, and this is accomplished with an all-tube fixed gain pre-amp circuit. In

general, compressors are used to sustain melody lines, minimize changes in signal

level, or add a “forward” percussive effect to instruments or drums.

- CONTROLS -

COMPRESS Knob— Varies the amount of compression from minimum (counter-

clockwise) to maximum (clockwise).

WARNING: There are extremely high voltages in the Black Finger even when

it is unplugged DO NOT OPEN THE BLACK FINGER. –

Product specificaties