| 1. | The preamplifier of the monophonic 930 was the tube 139.
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| 2. | The output of the preamplifier goes through 2 electronically tuned transistors.
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| 3. | Both current paths are completed using the aircraft band rx preamplifier.
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| 4. | This preamplifier is frequently phantom powered in sound reinforcement and studio applications.
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| 5. | You'll need a microphone preamplifier or a different connection method.
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| 6. | The output of the preamplifier is sent to a helical resonator filter.
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| 7. | Depending upon the amplifier design, a phono-preamplifier may be necessary.
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| 8. | For this example, the microphone preamplifier is built into a mixing board.
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| 9. | The noise performance of a preamplifier is critical.
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| 10. | DI out-equipped units effectively turn the practice amp into a preamplifier unit.
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