I believe Mike Peake has been working on cloning this oscillator as well. You can contact him on the Electro Music, Modular Synth or Muff forums if you like.
On Oct 5, 2009, at 4:36 AM, dan wrote:
Hello !
Have been building clones of the moog 901a and b modules.
0,5W carbon resistors, 2N4058 and 2N 3392 transistors
and CA3019 and big pcb´s like the original
I can´t compare the sound to the original, but i think its warm and fat.
But there is one small issue
in higer pitch there is some modulation in the wave, like realy fast vibrato,
How do the original moog 901 sound in the higer pitch regions?
You can find a sound example in the files menu
/Dan Lind, Sweden