VAC Phi "Kappa 30i" - Manual (Page 8)

7
Replace the screws that secure the top frame.
Turn clockwise to tighten.
Tighten the four white nylon setscrews that
secure the front glass using the tool provided.
Turn clockwise to tighten.
Do not over tighten.
Install the vacuum tubes.
The large tubes have two pins larger in
diameter, and can only be inserted one way.
The medium size tubes have a plastic center
pin (“keyway”) that can only be inserted one
way. Do not to break this pin.
The small tubes have a gap in the pins that
matches the sockets, and can only be inserted
one way.