dannnielll
Prominent Member
Hi blue wizard, it is slightly off centre, but your analysis of the effect of capacitance on sonic performance, can be wrong. But not in the way you are thinking, your analysis of transmission through the cable is not in error. .. . And it affects the most expensive cables not the cheaper ones.
If the output impedance of an emitter follower,or source follower or cathode follower, drops below a certain level, it can allow the output transistors to go into oscillation..The problem is more acute or likely with bipolar transistors, as they have higher current gain. The problem will be seen on high frequency transients as a damped ringing . People might hear this as a "brightness " , but it is an artefact.
Those cables which have been expressly designed to reduce inductance( which would increase impedence at high frequencies), by increasing capacitance (which reduces impedence at high frequencies), will be more susceptible. The incidence or probability will be length dependent.as the capacitance wil increase with distance. So it's a double whammy, increased capacitance and limited inductance.
The importance of this is that all amplifiers, except perhaps those using a transformer output, use emitter follower or source follower outputs.
If the output impedance of an emitter follower,or source follower or cathode follower, drops below a certain level, it can allow the output transistors to go into oscillation..The problem is more acute or likely with bipolar transistors, as they have higher current gain. The problem will be seen on high frequency transients as a damped ringing . People might hear this as a "brightness " , but it is an artefact.
Those cables which have been expressly designed to reduce inductance( which would increase impedence at high frequencies), by increasing capacitance (which reduces impedence at high frequencies), will be more susceptible. The incidence or probability will be length dependent.as the capacitance wil increase with distance. So it's a double whammy, increased capacitance and limited inductance.
The importance of this is that all amplifiers, except perhaps those using a transformer output, use emitter follower or source follower outputs.