Alterrex Support

ALTERREX excitation systems were supplied for large steam turbine-generators between 1965 and 1992. Excitation power for these systems is supplied by a shaft-driven alternator-exciter with a stationary armature and rotating field. The alternator output is rectified by a set of stationary diode bridges and then applied to the main generator field. Today, these systems exhibit the same characteristics as any aging control system with parts availability, service availability, increased maintenance and limited data access for operations and maintenance. In addition, the AC generators still require maintenance of the commutator and brush rigging along with balancing, bearings and cooling systems.



  • ALTERREX cards/parts in stock
  • 12/18 month warranty provided
  • Both unused and remanufactured conditions
  • Exchange program available



  • State-of-the-art automated test equipment for fast and complete component level troubleshooting
  • Repairs carried out in house
  • Comprehensive completion report issued with every repair
  • Test and Certification on Spares


Field Service

  • Troubleshooting / Commissioning


Asset recovery

  • Buy Surplus panels
  • Buy Core upgrades
  • Buy unwanted spares 


The world’s largest stock of genuine GE Speedtronic spares.

Tel: (+1) 914-693-0830


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