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That resistor goes from the base of the transistor to ground and burns when the transistor is over driven or in this case most likely a serious imbalance between the 2 stages due to mismatched transistors I suspect.


Look at the resistor R26 for signs over heating which is there as an indicator of an imbalance also at the combiner for that stage unless it's one of the smokeless resistors which is blue or gray in color and it may show signs or not due to it's high heat tolerances.


Bet is that transistor TR-9 is toast.