diyitalia forum

robi ha scritto: ciao mlessio, non ho capito il senso di queste due affermazioni: suona meglio o non hai sentito differenze?

Anyway I've attached the results and it turns out, there is a difference! In the 1.5Khz test the odd order harmonics have increased in volume and in the 3Khz and 6.1Khz tests a lot of the higher frequency harmonics have increased in volume. The latter result I find odd as the general consensus is that Polyester Capacitors roll off the high end a bit but in this case it has increased. As for the listening test well the amp sounds a lot better, the high end is no longer piercing and you can definitely hear an increase in the harmonics. The tone is fatter and much more pleasing to the ear!

Electrolytic caps generate a good deal more distortion than film caps, but again, the same general rules apply:
1: Distortion is proportional to the signal voltage across the cap. This means the distortion will occur near to the -3dB frequency. Above or below this the signal voltage is either very small, or the output signal becomes so small that distortion becomes lost in the noise floor.
2: Distortion falls as the voltage rating is increased.
3: Distortion is less when the DC polarising voltage across the cap is just a few volts (more than zero but less than 10V, usually). Good news for cathode bypassing!
4: Non-polar aluminium electrolytics generate about an order of magnitude less distortion than polar aluminium types.
5: Tantalums are about an order of magnitude worse than polar aluminium electros.