This is an original Gibson Maestro Boomerang Wah Wah pedal. I bought it in
1971 at Manny's on 48th street NYC. It's still a great pedal, but I've been using
a DOD FX-17 Wah/Volume for years now. The pot travel/gear setup is optimal
for best Wah without going ultrasonic, but just OK for volume. The Pedal gear is
spring loaded, and will back off the pot gear with just a little finger pressure so
adjusting the pot travel (for Wah or Volume) is very easy, just be sure to leave a
little travel at the end for clicking the footswitch. See the Guts and Pot photos below.
This pedal has been modified from the stock original. I converted from the difficult
to find very expensive Eveready Type 226 barrel battery to a conventional 9 volt.
Hey, the Energizer Bunny and Coppertop were years & years away and 9 volt
batteries had a nasty habit of leaking or bursting. The 226 battery, when found
cost $8 or more and in the70s that was way too much to pay for a battery when
a 9V could be had for 69 cents and a box of Good & Plenty was a nickle.
I replaced the original flakey transistors with modern reliable 4400s. There are two
spares under tape just in case. The no-name crappy pot took a hike in favor of a
Mil Spec Allen Bradley that will last a very long time before getting "scratchy" or
Asking $125 firm, U.S. or APO shipping included.
Wah Wah Guts
Spare transistors shown under tape at left past the schematic.
Allen Bradley Mil Spec Pot
The AB pot. Can't blame the Gibson engineers, in 1971 these were hard to come
by in the civilian marketplace and were $4 compared to 59 cents.
I guess the technical editor read Wow Wow instead of Wah Wah at SW1.
Jimi, Eric and Frank never ever used a Wow Wow!
Wow, wow! They made 17304 of the beasties before mine.