Those power ratings are before the IHF stepped in during the early 1970s to standardize power ratings, by creating the 'RMS power' rating.
By that method of measurement the amplifier at the first link will make about 50 watts.
That circuit could stand with some changes! There are no stopping resistors at the input of any of the tubes. This can lead to oscillation which is why there are plate chokes and resistors in the output section. The input voltage amplifier is dreadful! It is a balanced circuit but has a poor Common Mode Rejection Ratio (CMRR). With less parts used, its performance could be dramatically improved by being operated differentially (which takes less parts). This would eliminate the need for the input transformer.
By that method of measurement the amplifier at the first link will make about 50 watts.
That circuit could stand with some changes! There are no stopping resistors at the input of any of the tubes. This can lead to oscillation which is why there are plate chokes and resistors in the output section. The input voltage amplifier is dreadful! It is a balanced circuit but has a poor Common Mode Rejection Ratio (CMRR). With less parts used, its performance could be dramatically improved by being operated differentially (which takes less parts). This would eliminate the need for the input transformer.