odie_one (./1) :
J'ai beau baisser ou augmenter le son à fond, cela ne change, le grésillement est toujours au même niveau sonore.
Certe, ce n'est pas énormément fort, mais y a t'il un moyen de "gaumer " ce défaut ?

Mettre le volume au maximum ?

Plus sérieusement, c'est un défaut connu de la Vectrex (FAQ dispo ici) :

Q. My Vectrex is very noisy; is there anything I can do to make it any
quieter?

Here is what Daniel A. Muntz (dmuntz@quip.eecs.umich.edu) said helped
him: The noise isn't digital in nature and it closely follows the
video. It also isn't a power supply problem; isolating the audio input
of the amplifier from the sound circuit revealed no noise at all. It
seems the noise is generated in two ways:

1: By induction; Moving the audio cable around makes the noise less or
more prominent. It is at minimum when the cable is placed in its
original manufactured groove. Good design since that's farthest from
the CRT yoke.
2: By ground impedance; Although all supplies are clean the hum is still
present in the modulated DC difference between the two boards.

A definite improvement can be achieved by doing the following:

1: Rewiring the ground between the digital and video board.
2: Shielding audio circuit and changing cable to volume pot to a better
shielded one.

A tutorial on how to reduce the buzz in your Vectrex is here:
http://www.classicgaming.com/vectrex/no_buzz.zip [6/99]

John Dondzila has noted that placing a piece of clear tape over the speakergrill can also reduce the buzz. [6/99]