Merced, CA (April 12, 2006)–LaChapell Audio, a new company developing high-end vacuum tube pro audio equipment, has announced its first commercial preamplifier: the two-channel Model 992.
LaChapell’s Model 992 Built specifically around the NOS 6072 vacuum tube, the Model 992 is a dual mono fully balanced all-tube preamplifier and instrument input amplifier designed for commercial recording and broadcast. Meticulously hand assembled, the 992 utilizes eight total vacuum tubes.
LaChapell believes that the 992’s sound distinguishes itself from other tube preamps due in large part to its input stage design. The Microphone stage is a transformerless balanced differential input utilizing two U.S.-made 6072As per channel. According to LaChapell, its technique of using large matched capacitors with the 6072s to balance the input instead of a transformer is unique and a vital design requirement for capturing the essence of the 6072. Instead of allowing a transformer to assist in providing gain LaChapell puts the full burden of that task on the tubes themselves, which is said to result in considerably more tube ‘flavor.’ The direct instrument input (Hi-Z) utilizes a high performance Jensen direct transformer which feeds the balanced differential amplifier input.
From there, the signal reaches the cross-coupled push-pull output stage where LaChapell has placed two 12AU7 tubes in parallel along with the Jensen JT-11 transformer to balance the outputs. The balanced class-A circuitry used throughout this amplifier provides twice the headroom of single ended designs as well as low noise performance. In operation, the user has separate control of the input and output gain stages for each channel. Output signal strength is monitored through a large Sifam back-lit VU meter. There are also five illuminated toggle switches per channel for phase reverse
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