Filament Transformers

Osborne designs and produces high impedance and unregulated Filament Transformers. An unregulated filament transformer supplies a specified voltage and current to the filament of an electron vacuum tube. High impedance filament transformers are designed around a tungsten tube filament. Osborne often works with our clients to increase the life-span of their vacuum tubes through the use of a regulated voltage supply.


Let’s talk about your project.


Contact Us

Filament Transformer Design Options Table

Spec Range Available
Primary Voltage: 1 – 10,000 Volts
Filament Voltage: 0.1 – 20,000 Volts
Filament Current: 0.001 – 50,000 Amps
Capacity: 0.000001 – 6,000 KVA
Frequency: 45 – 1,000,000 Hertz
Phase: Single Phase to Multiple Phase
Electrostatic Shielding: Single to Multiple Shields
Terminals: Wire Leads – Finger Safe
Enclosures: Open Core & Coil – Hazardous Environment
Dielectric Strength Testing: 50 Volts DC to 50,000 Volts AC
Agency Approvals: UL, CSA, CE and/or TUV

What Are Osborne’s Filament Transformer Design Options?

“Design Options” refers to the types of features typically available for Osborne’s Filament Transformers. We share these options to help you determine if Osborne’s capabilities are a good fit for your project.

If you’re looking to develop a custom filament transformer and it fits in the ranges of Osborne’s filament transformer design options table, there’s a great chance that we can make your project a success. Call Osborne today at 800-229-9410.

Why Choose Osborne?

Premium filament transformers are ideal for select applications. Does your project demand exceptional design service and high performance? If so, please consider our Design Options page for details about the performance benefits of application specific engineering. Next we encourage you to visit our Partners page for a clear idea of Osborne’s unique collaborative development approach.