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Magluvin,the toroid is the core,why they used this as a filter choke is strange,in the past,in the vacuum era ,they used filter chokes.they had an input capacitor,hooked to a filter choke,which hooked to an output capacitor.Sometimes the filter choke shorted,this caused a loud hum on the audio.In a stereo you would get a loud hum if the toroid lost its inductance or it dropped to a low amount,it would act like a shorted filter choke. In the pictures there are 2 toroids both use the same type of core,same number of turns,one is wound in a standard way,the other is wound like the tpu one.The standard one reads `19.2 millihenries,the other one reads .019 milliheries,it lost most of its inductance it will not work as a filter choke.
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