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To replace the Darlington transistors, remove 4 mounting screws on each heat-sink. The TO3
Insulator Sil-Pads should always be replaced when a transistor is reinstalled for any reason.
After replacement the Darlington transistor mounting screws must be torqued to 8 inch pounds.
If a transistor has failed, be certain to test the emitter resistors R11-R14.
POWER TRANSISTOR REPLACEMENT