FX25 Envelope Filter
Two 'original series' cosmetic variants of the FX25, from 1984 (left) and late 1987
The FX25 Envelope Filter was derived from DOD's well-received 440 Envelope Filter. Like the 440, the FX25 uses a bandpass filter circuit where the peak frequency is determined by the input signal level, for a touch-controlled wah or auto-wah effect. The FX25 was one of the original ten DOD FX-series pedals that debuted in 1982, and remained in production until it was replaced by the FX25B in 1998.
- Controls: Range, Sensitivity
- List price (Jan. 1983): $69.95
- Technical info:
- Specifications (circa 1984): Input impedance = 500 k Ohms, Output impedance = 1 k Ohms; Filter frequency range = 50 Hz to 2.5 kHz; Filter Q (Range) = variable 1-100; Gain = O dB
- Notable IC chip: two RCA CA3094E high-current OTAs and one TL022CP op amp (1984); one LM13600N dual OTA and one MC1458CP op amp (1987)
- Component-side circuitboard images: Jan. 1984
Dec. 1987
- Specifications (circa 1984): Input impedance = 500 k Ohms, Output impedance = 1 k Ohms; Filter frequency range = 50 Hz to 2.5 kHz; Filter Q (Range) = variable 1-100; Gain = O dB
- FX heritage: FX25 FX25B
- Notable artists using the FX25:
- During early ZPZ tours (2006-07?), Dweezil Zappa used a FX25 (among other pedals). It was auctioned on eBay in September 2008 after he reconfigured his pedal drawer.
- During Nine Inch Nail's 2009 tour (and possibly earlier tours), guitarist Robin Finck used a FX25 (among other pedals). It was auctioned on eBay in December 2009.
- During early ZPZ tours (2006-07?), Dweezil Zappa used a FX25 (among other pedals). It was auctioned on eBay in September 2008 after he reconfigured his pedal drawer.
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