The LaChapell Audio Model 992 is a two channel fully balanced
all-tube preamplifier and instrument input amplifier.
Meticulously hand assembled, every aspect of the 992 speaks of our
dedication to quality of sound and solid, robust construction.
Utilizing a total of eight vacuum tubes promises that the 992 will
absolutely awaken your ears with its warm melodic character and rich
low-end response. With the 992 you have the option of choosing between
two unique input topology configurations- TLS or EG. The
992 EG
(extended gain) utilizes a Jensen
JT-115k transformer and the timeless
12AX7/ECC83 vacuum tube, and is able to provide a generous >74dB of
raw internal gain. With over 40dB of gain deployed to the input pot
alone your ability to explore the sonic richness of each stage
becomes even more dramatic than that of the 992 TLS. The direct
instrument input (Hi-Z) utilizes a high performance
Cinemag direct transformer which feeds the balanced differential
amplifier input.
From there the signal reaches the cross-coupled push-pull output stage
where we’ve place 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.
With the use of four tubes per channel, the 992 easily delivers
performance well beyond the limits of audibility.
In operation, the user has individual control over the input and output gain stages of each
channel. This provides uncommon flexibility to delve into the 992’s broad sonic pallet making
it one of the most versatile preamplifiers in any environment. Push the inputs hard and capture
that elusive air that can only come from fully balanced tube gain. Or, pull the inputs back and
favor the output stage for a cleaner, more linear signal - the choice is yours. Output signal
strength is easily monitored through an isolated Sifam back-lit VU meter. There are also five
illuminated toggle switches per channel for Meter On/Off, 48v (Phantom), -20db input pad,
phase reverse and Mute.
All of this is housed in a chassis that is built like a tank. Designed with reliability and “on the
road” stamina as a requirement, we start with high grade aluminum stock milled to a sturdy 1/4”
front panel with chip resistant powder coating for the finish. All internal components are well
secured using PEM type fasteners and tie-downs. And, of course, ultra-premium components
are used throughout: 3/4w Vishay resistors, ASC caps, sealed premium relays ... Our goal is to
communicate a sense of robust sturdiness when interfacing with the 992. Each unit is assembled
by hand with much care and attention to detail with the hope of preparing it to be the next
center piece for any professional recording or broadcast environment. We encourage you to try
one and experience for yourself what we think is a new standard of pure tube amplification.
Featured Highlights:
Amplifier Isolated VU Meters
Eight Total Vacuum Tubes
Fully Variable Input~Output Control
Robust Construction
Balanced Circuitry Throughout
Hi-Z Instrument Input
Premium Tubes Components
Jensen JT-11 Output Transformer
Individual Channel Mute Function
Product Specifications
Condition
Used / Vintage
Tube or Solid State
Tube
Channels
Dual-Channel
Chassis
19-inch Rack-mount
Rack Spaces
3U
Direct Input
No
Digital I/O
No
Input Connectors
Analog XLR
Output Connectors
Analog XLR
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