Simple DIY-fix to get a more open sound on your LITTLE PHATTY TRIBUTE EDITION

[danne71]

Simple DIY-fix to get a more open sound on your LITTLE PHATTY TRIBUTE EDITION
You only need to cut/desolder a capicator.

I was thinking of selling my "little Phatty TE" becouse of the lack of brightness in the sound. Ok i have heard that the oscillators was to blaim for this.(?)

Today i did some testing with a oscilloscope and the waveforms lock as they should both Prefilter and postfilter... hmm why not on the output? I found a extra capicator (10 nF, marked 103) in paralell with R62 to work as a extra LPF after the VCA....(Why?). When removed, the sound opened up and the phatty sounded more like a minimoog.
Now i do not need to sell the moog LPTE.. Im very happy.
/Dan Lind

[grenert]

Glad it worked for you! Do you know what the value is of R62? I'm wondering what the intended cutoff frequency is.

[danne71]

Not easy to see, but i think SMD code is 103 on the resistor(10K)

[grenert]

Wow, that is a cutoff of 1591 Hz. Pretty low, even for a 1 pole filter! Not surprising that it is audible. Is your photo a "before" shot, or did you decide you like it better with the capacitor back in place? Might be fun to make it switchable.

[danne71]

This is a "before" photo.
Lifted one leg of the cap so it dont get lost if i change my mind

[IgorCristo]

This is a "before" photo.
Lifted one leg of the cap so it dont get lost if i change my mind

After doing this, did you notice any distortion on the higher registers? Maybe it was done to limit noise on higher octaves.

Might be a good idea on the future. I quite like the sound of the Phatty as is.

The one thing I’d like to change on the Little Phatty is the range for filter EG. It’s simply not enough.