LaChapell Audio 992 Tube Mic Pre - Manual (Page 2)

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Introduction:
Congratulations on your purchase of the LaChapell Audio 992, a fully
balanced pure class-A vacuum tube preamplifier and instrument input amplifier. LaChapell
Audio has gone to great lengths in making sure this preamp not only deliver world class
performance numbers but more importantly, deliver them with warmth and character while
using only the finest components.
Target Application:
Depending on which variant you’ve purchased (TLS or EG…)
the 992 can easily accommodate virtually any recording requirement. The 992 TLS, with its’
transformerless/6072 input configuration, excels on sound sources such as voice, acoustic
guitar, violin, drums or any active hi-Z instrument source.
The 992 EG (Extended Gain) utilizes the Jensen JT-115k input transformer with dual
ECC83 vacuum tubes per channel. With improved noise performance (EIN: -129 loaded/A-
wtd.) and >74dB of internal gain this 992 variant closes the gap for those using ribbon mics,
recording distant or faint sound sources and/or passive hi-Z instruments.
Before You Get Started:
Stated below are a few areas that you must take the time to read before you power up and
use the 992. You as the owner/user are responsible for completely understanding how to
operate this devise safely and properly.
• UNPACKING: Inspect thoroughly! Although we take extreme care at final assembly and packing,
things can happen during transit. It is very important that you contact LaChapell Audio if there is
anything broken or damaged upon receipt of package. Shipping is always insured and we will do our
absolute best to satisfy any legitimate claim as long as it is made within 10 days of receipt. Included in
every package should be:
(1) Model 992 preamplifier, (1) AC power cord, (1) packet of mounting
screws, (1) owner’s manual w/registration card. It is a good idea for you to retain the packaging (box,
foam caps and plastic bag) in case there is a need to return the unit for service or repair at a later date.
• MOUNTING:
Always allow for plenty of ventilation around the sides and top of preamp. Unlike
most 2-channel vacuum tube units, the 992 uses a total of eight tubes; this generates a lot of heat. It is
also important to NOT mount this unit above other sources that generate heat such as power
amplifiers or other tube gear. Always provide at least 1U (1 rack space) of clearance above the 992.
Mounting in travel racks in not recommended. Keep in mind that the vacuum tubes are mounted in
sockets and on rare occasions can shake lose if subjected to prolonged rough handling. Finally, the
992 should never be mounted or placed in areas that would expose it to any form of moisture.