It's not clear (literally) which component in the pictures is suspect.
However, the N1254A amplifier was never intended, nor is it suitable, for
repeater service. It was designed as an accessory for the MX300
ConvertaCom, where its duty cycle was very low, and it was fed just 4 to 5
watts. The
A photo of the entire PA may help someone identify it better. Looks like a
resistor. If it's one of the resistors I'm thinking of, it might be cheaper to
replace the entire board because the final transistors may be blown. But, it
can't be certain without more information. And I'm not that much
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