After almost 15 years of flawless service, I have replaced the Tentec Centurion with an ACOM 2000A automatic tuning amplifier. I have been reluctant to make this change given the great tenure of the Tentec, however the rapid band changing ability will be great to have. I struggled between the ACOM and another Elecraft KPA1500 which is one great amplifier. I elected to go with the ACOM primarily for its much quieter operation, opting not to have two amplifiers with fans running to keep their heat sinks cool.
