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The TLAudio Ivory 2 Series 5051 Mono Valve Processor is a single-channel voice and instrument processor, featuring a four-band equalizer and a noise gate. It incorporates a single illuminated VU meter to monitor input level, output level, or compressor gain reduction. An optional DO-2 digital output card allows 24-bit analogue to digital conversion via an RCA phono type SPDIF output, with selectable 44.1 or 48 kHz sample rates and the option to clock the converter to an external word clock source.
The 5051 is designed to process audio signals, offering compression, equalization, and gating with the added benefit of valve stages for warmth and presence. The preamp stage features 48V phantom power, a 30dB pad, and a high-pass 90Hz filter. A Drive LED indicates the signal level through valve stages, glowing more intensely as the level increases, and a Peak LED warns when the signal is 5dB below clipping. The unit is suitable for a variety of applications, from recording vocals and instruments to processing sub-grouped signals or stereo mixes.
The 5051 offers flexible input options, including electronically balanced XLR connectors for mic and line inputs, an unbalanced mono 0.25” jack for line input, and a front panel instrument input for direct connection of guitars, basses, and keyboards. Output is provided via balanced XLR and unbalanced 1/4" jack, which can be used simultaneously. A rear panel switch allows matching line input operating levels from -10dB to +4dB (unbalanced) or +4dB to +18dB (balanced) to accommodate various equipment, including digital recorders.
The Input Gain control adjusts the signal level into the unit and drives the internal triode valve stage, allowing for variable harmonic distortion and the characteristic "valve sound." The yellow Drive LED indicates the intensity of this effect. The compressor section features Threshold, Ratio, Attack, Release, and Knee controls. The Knee switch allows selection between "Soft Knee" for a subtle effect and "Hard Knee" for more pronounced compression. Gain Make-Up boosts the compressed signal level to match the uncompressed signal, while the Output Level control sets the overall output. The VU meter can monitor input level, output level, output +10dB, or gain reduction. The Compressor On switch allows A/B comparison of processed and unprocessed signals.
The gate section, located before the compressor, features an adjustable threshold and a red LED to indicate when it is active. The four-band equalizer provides continuously variable cut and boost, with rotary switches for selecting corner frequencies (LF and HF shelving bands) or centre frequencies (LM and HM peaking bands). The EQ Pre switch allows the equalizer to be placed before the compressor, making the compressor frequency-conscious.
For stereo processing, two 5051 units can be linked via a rear panel socket and the front panel Link switch. This ensures both channels react together to prevent dynamic imbalances in stereo signals. The optional DO-2 digital output card provides 24-bit A/D conversion with selectable 44.1 or 48 kHz sample rates and a word clock input for external synchronization, allowing the 5051 to integrate into digital setups as a master or slave.
The Ivory 5051 requires minimal installation, but safety precautions must be observed. All mains wiring should be installed and checked by a qualified electrician, and the unit must be earthed. Users must ensure the correct operating voltage is selected (internally set for 110-120V 60Hz or 220-240V 50Hz, changeable only by an authorized service centre) and that the correct 20mm anti-surge, 1AT rated at 250V fuse is used. The unit should never be operated with the cover removed and must not be exposed to rain or moisture. Adequate ventilation is required to dissipate heat generated by the valve heater, so the side grills should not be obstructed, and the unit should not be placed near external heat sources.
The 5051 is supported by a limited one-year warranty covering faults due to defective materials or workmanship. The warranty excludes damage from misuse, tampering, incorrect voltage, or incorrect fuse usage. For service, the unit should be sent to an authorized dealer with a description of the fault, in its original packing for protection during transit. Proof of purchase date is required for warranty claims.
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