Quality Transformer Electronics Varian MED 4950 Klystron Transformer Inductor

Quality Transformer Electronics Varian MED 4950 Klystron Transformer Inductor

This is a multi-tap transformer or inductor (model 4950, part number 01005164) manufactured by Quality Transformer and Electronics to Varian M.E.D. specifications. It was pulled from a Varian high-voltage klystron power supply. The component features a toroidal winding on a laminated E-I core housed in a painted steel frame with four mounting feet. Seven numbered leads exit the winding — leads 6 and 7 serve as the primary (input) winding, and leads 1 through 5 form a tapped secondary with lead 5 as common, providing multiple output voltage levels from a single winding.

Specifications & What's Included

• Manufacturer: Quality Transformer and Electronics
• Model No.: 4950
• Varian Part No.: 01005164
• Secondary / Date Code: 91-27
• Code Ident No.: 53615
• Customer OEM designation: Varian M.E.D.
• Total leads: 7, numbered 1–7 on the winding body
• Primary (input) leads: 6 and 7
• Secondary leads: 1, 2, 3, 4, and 5 (tapped; lead 5 = common)
• Measured output — leads 1–5: 8.97 VAC (with 10.6 VAC applied to leads 6–7)
• Measured output — leads 2–5: 43.2 VAC (with 10.6 VAC applied to leads 6–7)
• Measured output — leads 3–5: 20.6 VAC (with 10.6 VAC applied to leads 6–7)
• Measured output — leads 4–5: 10.00 VAC (with 10.6 VAC applied to leads 6–7)
• Form factor: open-frame, panel-mount with four bolt-down mounting feet
• Construction: toroidal winding on laminated core, black painted steel enclosure
• Terminal type: spade-tab leads, numbered on winding body
• No other testing beyond the voltage measurements above has been performed
• Transformer/inductor only — no cables or mounting hardware included

Applications

Klystron power supplies are high-voltage, high-current systems used to power klystron vacuum tubes — microwave amplifier and oscillator tubes found in radar transmitters, particle accelerator RF drivers, satellite uplink stations, and industrial microwave heating systems. Varian Associates (later Varian Medical Systems) was one of the primary manufacturers of klystrons and the specialized power supplies designed to drive them, which typically require multiple precisely regulated DC voltages for the cathode, heater, focusing coil, and beam voltage circuits. A tapped transformer or inductor of this type serves as a key passive component in the power conversion and filtering stages of such a supply, providing isolated, stepped voltage levels from a single magnetic element. This particular unit dates from 1991 (date code 91-27) and is suited for use as a replacement or repair part in Varian klystron power supplies or other high-power RF/microwave transmitter power systems requiring comparable multi-tap magnetics.