Which tubes should be used in Synthesis amplifiers as replacements or for a sound upgrade?
With Synthesis, the suitable tube configuration depends strongly on the series. The Roma 753AC uses 12AU7 and EL34 / 6CA7, the Roma 37DC+ uses a 6DJ8 input stage, and in more powerful models such as Action A100 Titan or Metropolis NYC100i, KT66 concepts are used. Therefore, the tube choice for Synthesis should always be model-specific and not based only on the brand. Many suitable tubes for Synthesis are available from BTB in selected quality, with power tubes also available as matched pairs or quartets.
