Just heard back from Acoustic Plan, I can use EC86, E86C or EC806S tubes from any source. They confirmed that BAC tubes would no longer be available. They also said that it is important that the tubes be "matched to a quartet".
Do you know or can you suggest a source that will describe the expected sound differences among the three tube choices?
Do you know or can you suggest a source that will describe the expected sound differences among the three tube choices?