![]() Conversely, a pre-set manual bias adjustment recovers most of an EI output transformer’s primary inductance even if it suffers a warm-up imbalance. Thus, toroidal output transformers require a bias servo to ensure that there is never any imbalance of direct current, even during warm-up, so diligent toroidal output transformer manufacturers also supply bias servo modules. More importantly, when the imbalance was removed, the EI Hammond 1615 immediately recovered to 88% of its demagnetised primary inductance, whereas the toroidal Plitron PAT4002 only recovered to 20% (requiring explicit demagnetisation to restore full primary inductance). Note that primary inductance for both transformers falls catastrophically with even a small imbalance current, but that because interleaved EI cores still have an air gap (albeit very small) this causes the fall in inductance to be less severe than for the toroid. Note the severe dependence of output transformer primary inductance on imbalance current. ![]()
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