Varian Turbo‑V 250 Turbomolecular Vacuum Pump

It’s a turbomolecular vacuum pump, designed for high / ultra-high vacuum applications.

Sometimes called “MacroTorr” — that refers to its design for reasonably high gas throughputs.

Requires a dedicated controller. According to the manual, the 250-series pumps “must only be used with one of the special Varian controllers” (models like 969‑9423, 969‑9504, 969‑9523, etc.).

Runs on 58 VAC, 3-phase, ~933 Hz drive.

Permanent (dry) lubrication — no oil needed.

Supports air cooling natively, but there are optional forced-air or water‑cooling kits.

Can operate in any orientation.

Low vibration: < 0.01 µm (displacement) at the inlet flange.