FX20B Stereo Phasor / Stereo Phaser
FX20B Stereo "Phaser" (1987) and "Phasor" (1988)
The FX20B Stereo Phasor / Phaser succeeded the FX20 in late 1985, adding a Depth control and another output while revising the circuit to use three dual OTA chips. Although the 12-stage Boss PH-2 Super Phaser had been introduced in 1984, the FX20B featured six stages of phase shifting. The FX20B was produced with several cosmetic variants (see below) until 1998, when it was replaced by the final-series FX20C.
- Controls: Speed, Depth, Regen
- "Stereo Phasor" vs. "Stereo Phaser" variants: The original FX20 phase-shifting effects pedal followed in the footsteps of DOD's first-issue 201, 401, and 490 Phasors, which used the Mu-Tron spelling of "phasor" (instead of "phaser", as used by Ross and Boss, among others). The first FX20Bs were labeled as a "Stereo Phasor", although the instruction manuals referred to a "Stereo Phaser". In or around early 1987, the pedals briefly switched to the "Phaser" spelling, but they switched back to "Phasor" by the end of that year. Finally, when the "second series" DOD FX pedals were introduced in early 1989, the FX20-B was called a "Stereo Phaser" and retained that spelling for the rest of its production run.
- Grey vs. gold sparkle base coat variants: In the early 1990s, DOD "dressed up" the appearance of a few of their older pedals, including the FX20-B and the FX25. In early 1993 (around serial number 1300k), the FX20B's drab grey base coat was replaced by a gold sparkle base coat.
- Notable IC chips: three dual OTAs (first NE5517s, then LM13600Ns)
- FX heritage: FX20
FX20B FX20C
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