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Electronic Theatre Controls Inc

Will a magnetic transformer work with my ERP Phase Adaptive Dimmer?

The information in this post is provided to assist in troubleshooting. Perform work at your own risk. ENSURE ANY POWER FROM DEVICES HAS BEEN DISCONNECTED BEFORE SERVICING ANY EQUIPMENT. If you do not feel comfortable performing the work, please contact us or your local service center. Be aware that ETC and its Affiliates are not responsible for any damage or injury caused by service of our products by anyone other than us or our authorized service providers, and such damage is excluded from the product’s warranty.


When installing a magnetic transformer to a phase adaptive dimmer, there may be symptoms if the loads not turning on, shimmering, or popping off and back on. This applies to all Echo distributed, ERP, and Foundry Phase Adaptive Dimmer products. 

Description/Explanation of Issue

A Magnetic transformer that is under-loaded may not respond in a desired manner.  


  1. Get as close to max load as you can on the transformer. Ex: If you have a 75w transformer, use as close to 75w on the load side as you can. 
  2. Replace with an Electronic transformer.


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