FX75 Stereo Flanger
Two FX75s, from late 1984 (left, black text) and early 1987
The FX75 Stereo Flanger replaced the FX70 in DOD's lineup in late 1984. Featuring a Width control and two output jacks, the FX75 was much more versatile than its predecessor, but the flanging effect it could provide was still not very intense. That said, chorus-like washes of flange can be easily dialed in, and the FX75 can sound quite musical. The FX75 was produced with two color variations (see below) before it was replaced by the four-knob FX75-B in mid-1987.
- Controls: Speed, Width, Regen
- Black vs. blue text variants: The first FX75 pedals that were produced followed the FX70's color pallette (black text on a grey basecoat). In mid-1985 (around serial no. 331k), the text color was changed to blue, possibly to make it better "jump" out of a display case to a potential buyer at a music store.
- Technical info:
- Specifications (1984): Input impedance = 500 k Ohms, Output impedance = 1 k Ohms; Gain = 0 dB; Delay Time = 0.5-6 ms; Signal-to-noise ratio = 90 dB
- Specifications (1986): same as above, plus Maximum Input Level = 4 V P-P, Bandwidth = 40 Hz-16 kHz (dry), 90 Hz-12 kHz (delay); Sweep Speed = 0.1-8 Hz
- Official schematic provided with pedal by DOD (dated 10/14/1984)
- Notable IC chips: MN3007 BBD chip driven by a MN3101 clock generator/driver CMOS chip; three TL022CP op amps (early versions) or one TL022CP and two 1458-type op amps (later versions)
- Internal trim pots: three; however, we do not recommend messing with trim pots
- Component-side circuitboard images: October 1984
January 1987
- Specifications (1984): Input impedance = 500 k Ohms, Output impedance = 1 k Ohms; Gain = 0 dB; Delay Time = 0.5-6 ms; Signal-to-noise ratio = 90 dB
- FX heritage: FX70 FX75 FX75-B FX747 FX75C
- External links:
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