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Product Specifications*
Product Specifications
What is an Analog Delay?
A delay circuit produces a replica of an audio signal a short time after the original
signal is received. If you listen to the original and the delayed signal together, the delayed
signal will sound like an echo of the original. If you then mix some of the delayed signal
with the original signal and feed the mixture to the input of the delay circuit, the delayed
output will be a string of echoes that die out gradually. You can determine how far apart the
echoes are by adjusting the delay time of the delay circuit, and you can determine how fast
the echoes die out by adjusting the amount of feedback from the delay circuit output to its
input. In addition, you can determine how loud the echoes are by adjusting the mix between the
original signal and the signal from the delay circuit output.
Today there are three types of delay devices: tape, analog and digital. The first delay
devices used magnetic tape to create the delay. The sound was recorded on a moving tape and
then played back after the tape had moved a few inches or so. Then, during the early 70s,
large-scale semiconductor analog delay circuits became available. These were called bucket
brigade delay chips, because they functioned by passing the audio waveform down a chain of
several thousand circuit cells, analogous to water being passed by a bucket brigade to put out
a fire. Each cell in the chip introduces a tiny time delay. The total time delay depends on
the number of cells and on how fast the waveform is “clocked,” or moved from one cell to the
next. Analog delays were less noisy, easier to use, and more reliable, and came to be more
widely used than tape echo units.
More recently, digital delay units have come into use. In a digital delay unit, the sound
signal is first converted to numbers. The numbers are stored in a digital memory for a certain
time, and then retrieved and reconstructed into the delayed audio waveform. One significant
difference is that the particular frequency and overload contours of well-designed analog
delay devices generally provide smoother, more natural series of echoes than digital delay
units. Another difference is that the echoes of a digital delay are static because they are
the same sound repeated over and over, whereas a bucket brigade device itself imparts a warm,
organically evolving timbre to the echoes.
The MF-104Z Analog Delay is unique because it combines authentic, finely-tuned vintage
analog bucket-brigade delay circuitry with total voltage control of all three performance
parameters.
Features
- DELAY TIME rotary control, which adjusts the delay time from slightly less than 50
milliseconds to 500 msec in the SHORT position; 100 msec to slightly more than 1000msec (1
second) in the LONG position.
- MIX rotary control, which adjusts the mix between the direct and the delayed signals.
- FEEDBACK rotary control, which adjusts the amount of delayed signal that is fed back to
the input.
- INT. LOOP-EXT. LOOP switch routes the feedback either directly or through an external
effects processor that you hook up. For example, inserting the MF-102 Ring Modulator in the
feedback loop will create echoes that change timbre as they die out.
- DRIVE rotary control, which adjusts the gain of the audio input to the delay.
- OUTPUT LEVEL rotary control, which balances the delayed signal with the bypassed signal.
- LOOP GAIN rotary control, which sets the gain of the external feedback loop.
- LEVEL, a three-color LED that is used to set the DRIVE control.
- LOOP LEVEL, a LED that aids in setting the external loop level.
- BYPASS, a two-color LED that tells whether the delay is active or bypassed.
- ON/BYPASS, a rugged, smooth-acting ‘stomp switch.’
Jack Panel Features
- AUDIO IN 1/4" phone jack - accepts any instrument-level or line-level audio signal.
- MIX OUT 1/4" phone jack - delivers the delayed and the direct signals, depending on the
setting of the MIX control.
- DELAY OUT 1/4" phone jack - delivers just the delayed signal.
- TIME, MIX, FEEDBACK, all of which are stereo 1/4" jacks that accept moogerfooger EP1 (or
equivalent) expression pedals, or control voltages from two-circuit or three-circuit 1/4"
jacks.
- LOOP IN - 1/4" phone jack - provides access to the feedback loop for connecting an
external processor.
- LOOP OUT 1/4" phone jack - provides access to the feedback loop for connecting an
external processor.
- +9V POWER INPUT jack - accepts standard 9 volt power adaptors (power adaptor included).
General Specifications
- CASE: Black panel with hardwood sides - classic analog appearance.
- DIMENSIONS: 9" x 6" x 2-1/2"
- NET WEIGHT: 3 lb
- SHIPPING WEIGHT: 5 lb, including power adaptor and instruction manual.
- POWER REQUIREMENTS: 105-125 volt, 5W or 220 volt power adaptors available.
Specifications subject to change without notice.
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