I got a set of electro harmonix 7591 output tubes and 2 of the 4 went kaplooie in 2 months. I then sourced 4 nos Westinghouse and couldn’t believe how much better they were in their power delivery and Sonics. I only use telefunkens or Mullards for tone and phono stages.
They sure were doing something differently back then if the equipment today is the same.
They sure were doing something differently back then if the equipment today is the same.