joule la150mkII- preamp


hi guys,

i have a Joule  lA 150 se [mk ii ]. the gold knobs on them look dirty . i was looking for a way to remove the knobs, but i just can get them off. no screws or hex nuts or holes. can anyone help. or , can someone recomend a way to clean the knobs while on the pre amp without damaging it?

thank you

sy

syhilly0107

I'd also say pull them straight out. Be careful cleaning them though because I think that they're just plated  had the LA100.