About Us

The History of Prem Magnetics


Prem Magnetics was founded in 1972 by W.T. Peterson and Frank Prem, as a division of Prem Enterprises, a machine shop. 

Mr. Peterson and Mr. Prem recognized that other products in the industry lacked quality standards, and pursued to make the highest quality coils and transformers possible. 

As the business grew rapidly, Mr. Peterson needed additional help with the operations. In 1978, Roger Liston was hired as General Manager. Mr. Liston came to Prem after holding executive roles at several large coil manufacturers, but his entrepreneurial spirit made him want to strike out on his own. 

In 1979, Prem Magnetics became a separate Illinois corporation owned by Mr. Liston and Mr. Peterson. After several more years of success, Mr. Peterson retired in 1984, and Mr. Liston became President of the company. 

After a successful career, Mr. Liston retired in 1994, and his two sons took over the business. They continued to expand the company’s manufacturing capabilities until their retirement in 2010. Today, the company is in its third generation of family stewardship.  


A Family-Owned Company



As a multi-generation family-owned business, company culture and family values are very important to us. Our Johnsburg, Illinois headquarters has over 25 employees focusing on office operations, complex part and small quantity production, and warehouse and shipping of finished products. Our Mexican facility produces high volume orders with over 30 employees.  
Our team members become part of the Prem family, with an average employee length of service of about ten years. We are also proud to have four Prem Magnetics employees with over 20 years of service, and three employees that have over 40 years with the company! 


Company Values

Prem Magnetics is one of the few manufacturing businesses in Johnsburg, standing strong thanks to key company values. 

There are three things that Prem is renowned for in the industry: our experience, our capabilities and our reputation for manufacturing quality products.  Our team is UL and CSA certified, as well as ITAR certified.

Our products are built with care by a close-knit team that has vast experience working together to ensure quality. Our key goal is to manufacture high quality transformers and coils that last. We work hard to supply products that we are proud to offer to our customers. As such, our products are 100% tested.

With dedication to providing the very best customer service, we also offer custom service solutions and regularly craft custom transformers to meet our customers’ unique needs.

Thank you for visiting our website and learning a little about our team. We look forward to doing business with you. We welcome you to browse our range of existing transformers or order a custom solution today!



Our main office is open from 8:00 AM to 4:30 PM (Central Time) on Monday to Friday.