BPT power conditioners, still have BPT 3.5 Sig, very high quality transformers used here. Don't know why they went away.
Puzzles me as well. These were really high quality and well executed balanced AC power conditioners-isolation transformer. I have the 3.5 Signature plus model purchased new in December 2008.
A superb unit that has easily stood the test of time. Good engineering design, built and implementation will do this. My audio system is better sounding due to its presence and usage. 2023 now and I appreciate it more than ever.
Charles