Just Google 6n8j. 6.8nF capacitor. Normal values are 0.022uF between 0.047uF, (22nF or 47nF). I tend to use 15nF caps as I don't like too muddy a sound, but 6.8nF is really small. Not surprising you aren't hearing much effect, especially if you are using the kit linear pot for tone. (nF= nanofarrads, uF = microfarrads).
The smaller the capacitor value, the higher the low-pass frequency 'knee' value is, so the less treble and mids get removed.
With bright single coils, 0.047uF is the standard factory value, and for duller humbuckers, 0.022uF is the typical capacitor value. With quite thick sounding humbuckers, 0.022uF is probably a good bet.
Last edited by Simon Barden; 24-06-2022 at 04:43 PM.