FWIU, the following points all have an impact on either the WPC and/or the heat generated.
~The class of operation (single ended, push pull).
~The type and configuration of the output tubes (triode, tetrode, ultra linear or pentode).
~The number of (mainly) output tubes.
~The amount of bias and plate voltage on the output tubes.
~The type of bias on the output tubes (fixed or cathode).
The bottom line is that tube amps of comparable or lesser wattage have far more excess heat than all solid state amps with the possible exception of a pure class A solid state.
Even less heat is generated by SS class D amps.
~The class of operation (single ended, push pull).
~The type and configuration of the output tubes (triode, tetrode, ultra linear or pentode).
~The number of (mainly) output tubes.
~The amount of bias and plate voltage on the output tubes.
~The type of bias on the output tubes (fixed or cathode).
The bottom line is that tube amps of comparable or lesser wattage have far more excess heat than all solid state amps with the possible exception of a pure class A solid state.
Even less heat is generated by SS class D amps.