Oh, so bridged mode allows a 50% increase without exceeding distortion performance standards. I forgot about the RM-200 which I also liked and heard many years ago. I doubt that Kevin Deal is selecting tubes which only exceed specs as many people reported excellent results with NOS and other brands of current tubes as well. I just thought that pushing the tubes harder, if that's what 100+ watt per pair might due, would lessen their effective life. I know several friends with Audio Research gear of the 1990s/2000s who decry the short lifespan of their output tubes.
My output tubes are run conservatively (6-6BG6) to produce 125w. So cool that the transformers are just barely warm to the touch after 3 hours of dynamic music listening. They last about 3,000 hours (luckily they are NOS and cost only $7 a tube).
My output tubes are run conservatively (6-6BG6) to produce 125w. So cool that the transformers are just barely warm to the touch after 3 hours of dynamic music listening. They last about 3,000 hours (luckily they are NOS and cost only $7 a tube).