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12BH7 shares similar characterstics with 12AU7.12BH7 is suitable for voltage amplifier amplication from audio to low-VHF frequency range.12BH7 can also handle higher current and power than 12AU7. This makes 12BH7 ideal for use in driver or buffer applications.Note that 12BH7 draws more heater current than 12AU7, and is not always interchangeable.