Get the Most Out of Your Turbines with GTC Control Parts
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Your Ultimate Resource for Control Parts and Repairs

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Gas Turbine Controls (GTC) offers a complete catalog of control parts, plus the capabilities to repair in our state of the art, custom built facility. 

Longevity Program

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Our extensive stock and ability to remanufacture and repair Speedtronic circuit boards and other components are unparalleled. We utilize Automated Test Equipment (ATE), custom test jigs as well as energized panels, allowing for full functional testing of all circuit boards. 

We offer a variety of circuit boards and component parts options, including:

  • New/unused surplus parts that were never used in service
  • Remanufactured parts that were previously in service
  • Exchange program that provides extra savings for the exchange of your pullout parts
  • Asset Recovery includes buying of surplus panels, core upgrades, unwanted spares and damaged pullouts

From the earliest Mark I through today’s current version, the Mark VIe, GTC provides support for the entire family of Speedtronic turbine control systems. 

Mark I-VIe Spares, Repairs and Service

  • Largest stock of spares in the world
  • 24-month warranty
  • State-of-the-art automated test equipment for fast and complete component level troubleshooting
  • Functional testing carried out in energized panels for added reliability
  • Repairs carried out in-house, in our custom built facility
  • Comprehensive completion report issued with every repair
  • Test and certification on spares
  • Troubleshooting / commissioning / control upgrades
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  • 100% guaranteed, tested, ready to ship 
  • Guaranteed availability 
  • Member’s only segregated stock
  • Reduced premiums with insurance

Mark I

Mark II

Mark III

Mark IV

Mark V

Mark VI

Mark VIe







Years of
Unparalleled Service

Controls Support

EPROM Backup

  • Site visits to back up each EPROM 
  • CD-ROM copy delivered to site 

LCD Upgrade

  • Upgrade for the Mark IV CRT 
  • Easy to fit (plug-and-play)
  • No downtime experienced

GTCIV Interface and Remote
Station Upgrade

  • Pioneering capabilities with Mark IV systems
  • Touch-screen display
  • Remote station to monitor and diagnose

HMI Upgrade

  • Upgrade <I> Dos to HMI or current HMI to GTCS
  • No unit down-time or shutdown
  • No PROM changes
  • Utilizes off-the-shelf ARCNET cards

<I> DOS and HMI Backup Computer

  • Replace your existing <I> DOS and/or Windows HMI


  • Courses available onsite or at our training facility
  • Predefined or customized training courses
  • Purpose built training facility offering hands-on training using energized panels
  • Extensive manuals supplied with in-depth content and diagrams

Field Service

  • Mark V Health CheckTM
  • Alarm clearing
  • Checking control constants on Mark V (IDOS)
  • DC power supply Health Check
  • File clearing
  • Battery Health Check
  • Cleanliness / cooling
  • Junction box and terminal tightness check
  • Long standing issues resolved
  • Sequencing modifications
  • Full report issued
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Discover What We Can Do for Your Controls

We Also Offer Full Support for Your Excitation Systems







All items supplied by GTC are backed by our standard warranty.
Ask about our Warranty XXL which offers 4 years warranty on selected parts.

Expert In-House Test and Repair Facility

With our extensive stock and ever-expanding test and repair facility, our custom-built headquarters provides advanced order processing, warehouse management and technological innovation opportunities to serve our customers efficiently and with a better product.

Our continuous growth to meet the needs of you, our customers, makes GTC an unrivaled secondary OEM parts and service provider.

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Why GTC?

As a GTC client, you’ll benefit by extending the operational life of your controls longer than ever thought possible.
 Plus, you’ll find our stock of all major panel components, including inverters, relays, CRTs, cables and printers, all OEM, fully tested and covered by our Gas Turbine Controls Corporation warranty. 

GTC provides the most comprehensive solutions to reduce the pressures of upgrading out-of-date turbine control systems and excitation, with the world’s largest inventory of Speedtronic control and excitation spares. In addition to providing control parts, GTC also carries out testing and repairs at their advanced in-house facility and their experienced field service engineers provide service, training, and support to our clients worldwide. 

With our complete array of products and services, GTC provides clients with the solution to extend the service of their current systems for years beyond OEM support.

GTC clients have saved money by extending the lives of their systems, such as:


Fix the following errors: