If heat is an issue, the Dynaco SCA-35 is a nice amp. It has well-designed output transformers and otherwise is a complete integrated amp with about 17 watts per channel. It should be renovated, as it is an older amp and should have its filter capacitors replaced, but it is very musical and very reliable if properly renovated.
There are a number of very cool updates available for it too.
There are a number of very cool updates available for it too.