V76 Preamplifier

The V76 plug-in pairs a modeled tube preamp module with a meter module. Its task is preamplification and broad filtering, not channel-strip compression or multiband equalization. A large range of stepped input gain, a fixed low-pass filter, and selectable high-pass options keep the workflow focused on gain structure and bandwidth.

Mic and Line use the same modeled circuitry, including the transformer, but Line introduces attenuation for higher-level sources. Drive is therefore best judged with the input mode established first. The final Output Gain is deliberately clean, allowing a more saturated preamp setting to be compared at a manageable level.

In an Apollo Unison insert, supported gain, polarity, filtering, and input selection interact with the hardware preamp and modeled impedance. Ordinary inserts still process sound without that physical interaction. Set drive, apply only the filtering the source needs, and compare with Power bypass. The meter's Input position is not raw incoming level: it reads after preamp amplification and filtering, which matters when diagnosing where a large level increase is occurring.

Manual — sections: Operational Overview; Unison Integration; V76 Preamplifier Controls; Meter Module Controls.

• Input Select: Chooses Mic or Line. Mic is indicated by the illuminated button lamp. Line uses the same modeled circuitry with 28 dB attenuation for line-level sources. Changing input mode can substantially alter level, so reduce monitoring or output before switching rather than assuming a harmless tonal toggle. Apollo Hi-Z connection forces Mic and disables this switch.
• Preamp Gain: Twelve steps are available: 3, 9, 18, 24, 34, 40, 46, 52, 58, 64, 70, and 76 dB. Increase it to drive the preamp harder, then compensate with Output Gain. These are not uniform 6 dB increments across the whole range.
• Gain Display: Shows the selected gain. Clicking it increments the setting; shift-click decrements. The Gain and dB text labels also provide increment/decrement shortcuts, useful when making controlled comparisons between neighboring stages.
• Polarity / ø: Toggles normal and inverted polarity; the lamp lights when inverted. Check it when combining microphone signals. It does not introduce an adjustable delay or continuously variable phase correction.
• Low Pass Filter: Switches a passive 3 kHz high-cut filter on or off. This is a substantial bandwidth restriction, useful for deliberate darkening or limited-band tone rather than a continuously variable treble shelf.
• High Pass Filter: Select Off/Flat, 80 Hz, 300 Hz, or combined 80+300 Hz filtering. Compare the lower setting for rumble control and higher/combined settings for stronger low-frequency restriction. The manual does not give adjustable slopes or resonance controls.
• Meter Select / Level Meter: Input reads after preamp amplification and filtering, not at the plug-in entrance. Output reads after Output Gain. The meter is relative and not calibrated to specific dB values; use host metering for exact level checks.
• Output Gain: Clean final adjustment from −infinity to +12 dB. Reduce it after increasing Preamp Gain to retain drive without an excessive output level.
• Power / Language: Power bypasses processing; lamps or the UA logo also toggle it. The locking lever in either module switches English/German interface text without changing sound. Unison Gain Stage Mode can expose Preamp Gain and Output separately to hardware control.

Manual — sections: Preamp Module Controls; Input Select; Preamp Gain; Low Pass Filter; High Pass Filter; Language Select; Meter Module Controls.