Complex sentence: Solid state linear amplifiers are more commonly in the 500 watt range and can be driven by as little as 25 watts, although AM radio broadcast transmitters of up to 50 kW are now solid state.
Split into simpler sentences: Solid state linear amplifiers are more commonly in the 500 watt range and can be driven by as little as 25 watts. However, AM radio broadcast transmitters of up to 50 kW are now solid state.