micDistinctive Tube and Transformer Circuitexpand_more0 mentions
Commenters point out that the U 67's tube circuit and transformer are what keep transformerless designs like the TLM 67 from truly replicating its sound. This circuitry is described as the source of a fuller, less 'clean' character compared to solid-state alternatives.
Widely praised
graphic_eqRecognizable Midrange Signatureexpand_more0 mentions
One listener noted that even when comparing the U 67 to the TLM 67, a perceivable similarity remained only in the midrange, suggesting the U 67 has a distinct midrange character that carries through comparisons.
Generally positive