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Class Information
Number: 330/201
Name: Amplifiers > With power or bias voltage supply > For plural stage amplifier > Filamentary cathodes heated by anode current or anode supply source
Description: Subject matter where the filamentary cathodes of at least one vacuum tube amplifying device of the plural stage amplifier derives its electrical heating supply either from the anode or anode power supply of one vacuum tube amplifying device stage of the plural stage amplifier.

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