Magnetic tape is thin and the material touching the air gap is little,
A useful experiment to get a transformer core to saturate at small levels is to get an ordinary E I or interleaved E lamination signal transformer and start subtracting laminations?
Do Sowter or Jensen transformers use silicon stell laminations? How about BBC specified transformers?
Is Haufe in Germany possibly the best source of cores? Do Telefunken V72s use Haufe cores?
It is a joy staring with a wound bobbin and beginning insetting the E laminations observing the inductsnce increasing when an L meter is connected to the winding terminals.
Hopefully these notes may inspire those interested to do their own exoeriments and discoveries.
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