rarara wrote:well mine has the bcbox I/O so lots of distortion when required
. i have never worried about a click as such until now, but my saw wave is noisy and harsh, so was thinking that this mod may help with smothness. this is an eternal circle of looking for a 'perfect' sound
I hope not..That was the biggest draw back with the xox that it eats so much time to get the sound right or at least good enough. To have it singing like a real 303 would be desire able after all the already performed efforts. Its only the mods that make the xox worthwhile since i dont like to slaughter my 303. MAybe i order one of the sumidas from tech transplant at one point..
Anyway..the most essential list to avoid having a very brittle sounding xox is..
5% carbon film resistors
Standard electrolytics with the typical mushy sound of cheeper caps..
avoid fake transistors.. better source the double ones yourself in old vcr´s
Use the original roland vca..
945 have a warmer sound to them
Original green transparent foil caps have a finer sound to them. ( do you oppose to that annto?)
Thats the basics..
well tune and adjust it…
How to do that? This thread could hold more info regarding that since there are plenty of points in the circuit where the behavior can be altered…
And than?
The big power supply question is a point that still needs to be investigated..
And the fx of transistors matching could be investigated..just going for high betas dont seems t nail it and even when nothing really indicates a special selection process it cant be excludet. There are exceptional good sounding 303´s out there..maybe by accident..or some got build with selected transistors while others got just randomnly equipped.. Wouldnt be the first time that such things happen during the production process of electronic instruments..