GTC Owns the worlds largest stock of GE Speedtronic control spares for the MKI, MKII, MKIV, MKV and MKVI systems as well as EX2000 and EX21000. New to the range of spares sold is Woodward Netcon 5000, Rolls Entronic and Westighouse WDPF and Ovation. PLease view our website for more details on spares and other services for GE Speedtronic controls.