I like the 5814a variant of the RCA Blackplate. It is more dynamic than the 12au7. The Cleartops are good if you like extended highs.
Re... the Blackplate 12AU7, the older the better. Early 1950s, low noise is best for the classic tube sound.
Re... the Blackplate 12AU7, the older the better. Early 1950s, low noise is best for the classic tube sound.