The circuit of the Retro is auto-adjusting the bias, no manual adjustment needed. Just replace the tubes (not even matched pairs are needed, though it measures better if they are used and we match output tubes quite closely as quads) if they tire out. They should last between 5,000 and 10,000 hours, at six hours per day this is around 3 years (based on 7,000 hours lifespan), at 12 hours halve that and so on.
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