The 1800 Wa-Wa Pedal was made in early '70s, two examples I have seen are from '73 and '74. They are a modified Maestro Boomerang circuit, right down to the EL Rad inductor.
- (2011-04-12) dearmond wa- wa 1800 vs. modded thomas organ crybaby wah wah by Joe Gagan
- (2011-04-13) dearmond model 1800 wa-wa vs. modded thomas crybaby II by Joe Gagan
- (2011-04-14) Dearmond Wa-Wa, wah/ volume 1800 '74. clean and dirty by Joe Gagan
No forum threads about this effect yet.