@klhrw1
The EVO 400 replaces the HP. It has 8 power tubes. There should be no issues connecting the previous generation preamp to the EVO other than the previous generation preamp does not have balanced and the EVO 400 amp does.
The EVO 400 replaces the HP. It has 8 power tubes. There should be no issues connecting the previous generation preamp to the EVO other than the previous generation preamp does not have balanced and the EVO 400 amp does.