FX67 Stereo Turbo Chorus

Both cosmetic variants, from 1988 (left) and late 1989

The FX67 Stereo Turbo Chorus was introduced in early 1988 as the "top of the line" chorus effect in DOD's lineup, with a suggested list price of $140. Like the Ibanez BC9 Bi-mode Chorus (produced from 1981-84), the FX67 featured two independent chorus circuits and was best used as part of a two-amp setup. The FX67 was discontinued in mid-1990 with the introduction of the FX68 Super Stereo Chorus.

• Controls: Speed A, Depth A, Speed B, Depth B
  
  
• From the manual: "The new Stereo Turbo Chorus gives a rich, thick, ebuillient chorusing effect not available before from a single chorus unit. The FX 67 Stereo Turbo Chorus has two completely independent chorus circuits. These chorus circuits are varied by a unique modulation scheme and mixed together which makes a distinctive chorusing sound. This technique gives the user truly different right and left outputs from a single chorus unit. The right and left chorus circuits are derived from separate chorus circuits and do not cancel each other out if summed together. This unique chorusing effect is unduplicatable even with the use of two separate chorus units."
  
  
• Technical info:
  
  
  • Specifications (1987): Input impedance = 500 k Ohms, Output impedance = 1 k Ohms; Delay Time = 5-8 ms (of both chorus circuits); Sweep Speed = 0.8-8 Hz (of both chorus circuits); Bandwidth = 40 Hz-16 kHz
    
    
  • Notable IC chips: Two MN3007 BBD chips, each driven by its own MN3101 clock generator/driver CMOS chip; one LM324N quad op amp; three 1458-type op amps
    
    
  • Internal trim pots: one; however, we do not recommend messing with trim pots
    
    
  • Component-side circuitboard images: March 1988 November 1989
    
    
  • Related circuit: FX60 (loosely based)
  
  
• FX heritage: FX67 FX68 FX64
  
  
• External links:
  • @ ftp.dod.com - instruction manual (1987), .pdf format
  • @ discofreq's FX site
  • @ harmony-central.com
  • @ noiseguide.com
  
  

home FX index America's pedal? field guide serial no. info FX literature
what's new? FX tech info links disclaimer/legal/contact us