I still can't find the review with the bench test measurements but per the stereophile review...
"Power output: 90Wpc into 8 ohms (20Hz–20kHz, <0.02% THD) (19.5dBW), 125Wpc (21dBW), both channels driven, at 0.2% THD."
https://www.stereophile.com/content/arcam-fmj-sr250-stereo-av-receiver-specifications
"Power output: 90Wpc into 8 ohms (20Hz–20kHz, <0.02% THD) (19.5dBW), 125Wpc (21dBW), both channels driven, at 0.2% THD."
https://www.stereophile.com/content/arcam-fmj-sr250-stereo-av-receiver-specifications