Shielded RCA cables

Hey guys! I’m installing the spring reverb in the TTSH, and I’m looking for shielded (preferrably double-
or triple shielded) RCA cables going to and from the reverb tank to avoid the electric interference (i’ve tried with ordinary cables but there’s just too much noise). Do any of you guys know where I can get a hold of decent RCA’s that meet this criteria in europe?