Why not use the finest NOS ECC83 such as Telefunken or Siemens? Personally, I prefer the TFK ECC83 "Ribbed" plates. The rare & expensive TFK ECC803 is extraordinary in sonics and price but the ribbed ECC83 is exceptional in its' own right. Siemens E83CC is another winner.
Jim Ricketts/tmh audio
Jim Ricketts/tmh audio