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It probably came with STK392-120 chips from the factory. I would use -150, or -180. Even better, order kit X480293 (about $35.00) from someone that sells Hitachi parts. The kit has 2 STK394-160 chips, which are even better. It also has a handfull of resistors, which may help you if the resistors on the board fried. If memory serves me correctly, the resistors that fail are usually 6.8 ohm, and grouped in sets of 2 in parallel, making 3.4 ohms. I have used 3.3 ohm in place of the two 6.8 and the convergence only needs a slight touch-up.
Be sure to get the heat sinks clean and shiny, then put a thin film of heat sink compound on the IC's. Those chips run pretty hot
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