UNIVERSAL AUDIO LA610-I SOLO610MIC PRE

Although it is strictly a single-channel device, the LA-610 conforms to the layout of UA's 2-610 and 6176 two-channel processors. A pair of modules occupies the front panel of this 2-rackspace unit, with the preamp controls on the left (see Fig. 1). A five-position switch on the front panel's lower-left side determines the active input. The switch can be set to Mic (500 or 2kΩ), Line, or Hi-Z (47kΩ, or 2.2MΩ)

Above that control is the input-stage Gain knob, one of three gain controls on the LA-610. The input gain control can be adjusted in 5 dB increments (-10 to +10 dB). The large 1½-inch-diameter level knob in the center of the panel is a trim control that reduces the output of the LA-610's gain block before the signal reaches the compressor section. The level knob is encircled by calibration marks (not decibel measurements) ranging from 0 to 10

The compressor module of the LA-610 features the same simple leveling amplifier controls as those of the LA-2A and its solid-state offspring, the UREI LA-3A. One large knob governs peak reduction, and the other controls makeup gain. Behind both pots are indicators marked 0 to 10. A three-position mode switch offers a choice of compressor bypass (the makeup gain stage is always active), compression (lower ratio), and limiting (higher ratio).

Beyond those parameters, the characteristics of the LA-610's compressor are determined by the behavior of its T4 electro-optical sensing cell. That cell uses the light-sensing properties of a photoelectric cell paired with a luminescent panel to generate the compressor's control voltage. The T4, which is also the brain of the LA-2A and LA-3A, adds its own unique attack, release, and knee qualities to the compressor

The three-position knob on the LA-610's compressor module selects the source for the meter on the faceplate's upper-right side. This meter can register the VU output of the preamp or compressor, or it can indicate gain reduction. The unit's AC power switch, purple jewel lamp, and logo reside below the meter, on the panel's lower-right corner.

Because any signal entering the LA-610 passes through the preamp and compression modules, the rear jack panel (see Fig. 2) contains only a mic input and +4 balanced line input and line output connectors (all XLR). There aren't any options for -10 dBV consumer-level operation, and inserts are not included.

A standard IEC power-cord connector and a fuse assembly are the only other rear-panel elements. The LA-610's housing is of sturdy all-metal construction and provides adequate venting for its five tubes (three 12AX7s, one 6072, and one 6AQ5).