Properly adjusted bias of the output tubes will maximize tube life while providing a strong and healthy tone.

The correct bias point for new tubes drifts quite a bit over the first few days of operation but after that, the characteristics stabilize, to a large degree. Because of this, we only order burned-in, match tubes sets from our suppliers or recommend our clients to purchase from Eurotubes.

Unfortunately tubes drift over time your tubes will require a different bias voltage in order to run at optimum performance. Failure to keep tubes properly biased can significantly reduce an otherwise fine tube's lifespan