Month: May 2025

Service on a rare Colorsound pedal

Just love the looks of these old pedals.

The outside consists of three knob, bypass switch for the Fuzz and a treadle for the speed and bypass of the phaser.

Inside the case there’s two separate circuit boards stacked. One for the fuzz and the other for the phaser.

Top circuit holds the phaser, appears to be a four stage phaser.

Bottom side of the phaser cicrcuit board.

The Fuzz circuitboards. A three transistor circuit, a pair of diodes back to back. A Colorsound Jumbo tonebender?

Bottom side.

The issue with the pedal is the phaser, sounds weak in its phasing. The old tantalum capacitors where replaced, the fets bias was recalibrated and the depth was adjusted. Now it sounds as good as new.

Servicing an Ibanez Standard Wau Wau

A vintage Ibanez wah pedal in nice condition, though it sounds a bit off.

The original screw is present along with a battery compartment on the bottom lid.

The guts. Shielded wiring for the signal cables.

Bottom side of the circuit board.

A quick fix for this pedal. The wah potentiometer was loose and just had to be aligned and tightened for the right sweep. The old electrolyte caps were swapped with new ones.

Once again ready to Rock!

Service/mod of a rebranded? Wah Swell pedal.

The pedal on the workbench, branded Förstärkardoktorn.

Förstärkardoktorn(Amplifier doctor) was a Swedish store selling musical instruments back in the days. It even has the original price tag on it.

The wah circuit corresponds a lot with Colorsound Wah Swell circuit, at least for the wah part. As seen in this pic there’s a double gang cermet potentiometer, using the other side as a volume pot.

Solder side of the circuitboard.

Here’s the circuit modified. Removed the passive swell part and wired it for true bypass, added a trimpot for overall output volume and adjusted the tone of the wah.