Does anyone have this pedal and can compare the values?
About 2 years ago I compiled some info on those Colorsound Wahs (and all the variations).
It was a bit of a headache and overall only a small number of samples for each model
could be found.
That Dec 1973 board looks very similar indeed to an Oct 1973 board I saw:
- 1973 Wah-Fuzz-Swell units used a single PCB.
- Clear block poly caps. Used on many Colorsound board around 1973/74
- Siemens BC169B transistors. Tinned lead which protude through the top of the device
- Siemens P14x8 potcore, T26 material. Again common for the era.
- Large body resistors, exactly like yours.
As for the electrolytic caps, the October 1973 unit had
- 2x10uF 16V, Sprague
- For the 47uF I don't have a confirmed value. However the package for your 47uF/10V
is very large. Larger than the 10uFs and in fact larger than the inductor. On the October 1973
unit that cap was 70% smaller than the 10uF's and nowhere near the size of the inductor.
For that reason I suspect it was in fact 25uF (Siemens).
Here's one with 22uF,
https://reverb.com/item/17335679-colors ... swell-1973
As for the inductor:
- Joe Gagan measured a 1972 Black Wah-Wah at 520mH 27 ohm. Which very much agrees with your 480mH 28 ohm.
500mH +/- 20mH is well within the expected +/-20% to 30% for these cores. The temperature coefficient is
probably 0.5%/degC to 1%/degC.
- The core is a Siemens P14x8 potcore, gapless with a center-hole, T26 material.
The T26 material ui is about 2200 and the AL is around 2100 nH/t^2.
I'm pretty sure the wire used was 38AWG (based on the resistance).
FWIW the 1972 Wah-Fuzz-Swell uses two PCBs - that's the 1971 factory schematic you posted.
The poly caps on the Wah board were Philips tropical fish and poly caps on the Fuzz board were
the turquoise Erie caps.
Something I noticed about the parts on Colorsound boards is they follow both the year and the model.
You might see different caps on different model boards made in the same year. No doubt the boards
were made in batches and used in multiple products. Later models don't necessarily use the same
schematic as earlier units. I saw quite a few minor variations. The tell tail signs of different era's is the
differ style of parts used. For example late 70s units had green caps and smaller body 1/4 watt resistors.
FWIW, the inductor should be 500mH on the schematic.