The Linlai Global Elite E-6SN7 are 56mm in diameter, or 2 3/16". Measure from center of socket outward half the distance of either those two measurements leaving enough clearance for neighboring 6SN7. I believe that clearance to be .5mm or .65mm
Important note: also keep in mind your top plate clearance, the chassis.
And hopefully someone will chime in with some Cary SLP-98 experience.