Universal Audio UAD Plug-Ins ver.7.5 - Manual (Page 500)

UAD Powered Plug-Ins Manual - 500 - Chapter 51: UA 610 Tube Preamp & EQ Collection
Unison Impedance
When UA 610-A or UA 610-B is used in a PREAMP insert within the
Apollo Console application, the hardware input impedance of the
Apollo mic preamp is switched to match the value in the plug-in for
physical, microphone-to-preamp resistive interaction.
With UA 610-B, matching the microphone to the closest impedance value is
generally recommended, but this parameter can be used creatively and will
not harm equipment connected to the Apollo mic preamp.
Note: For complete Unison details, see the Apollo Software Manual.
Input Pad/Gain In addition to the Input Select switch, both plug-in models have Pad and Gain
parameters that control the signal level at the tube input stage.
The Pad controls are used to attenuate incoming signals for less coloration,
while the Gain controls increase the signal level for more tube color.
Note: Like the original hardware, values on the control labels may not match
actual measured values.
UA 610-A
Input Gain
The two-position LOW/HI rotary switch exposes the little-known
internal gain jumpers that are on the circuit boards inside the
vintage modules. Setting the switch to the LOW position adds
approximately 8 dB of gain at the tube input stage and also
changes the distortion characteristics. This is a digital-only control unavailable
on the original hardware module.
Important: Use caution when switching 610-A Gain from HI to LOW, as
signal output levels could jump dramatically.
Input Pad
Additional attenuation for the Mic input is available via the two-posi-
tion Pad switch. Setting the switch to the “–20” (up) position attenuates
the Mic signal at the tube input stage by –20 dB. In the down position,
no attenuation is applied.
Note: The 610-A Input Pad is not available for line input.