LaChapell Audio 583E User Manual - Model 583E
LACHAPELL AUDIO 583E
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MODEL 583E
The LaChapell Audio 583E series module features a single-ended vacuum tube preamplifier designed
for use in the “500 series” format. The microphone input configuration consists of an input transformer
with a turns ratio of 1:10 and one ECC83/12AX7 vacuum tube. The instrument input stage bypasses
the transformer and goes straight to the tube. The output stage utilizes premium Burr-Brown and THAT
Corporation line drivers along with an 80% nickel alloy core transformer to generate a balanced line-
level output signal.
The 583E also features an ultra-clean transformerless three-band EQ section with fully sweeping
frequency controls and cut/boost settings of +/- 8dB. The EQ can run as an integrated EQ (serving the
preamplifier) or as a completly separate module.
BEFORE YOU GET STARTED
Stated below are a few areas that you must take the time to read before you install and use your 500
Series. You as the owner/user are responsible for completely understanding how to operate this device
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 Digital Audio Labs if there is
anything broken or damaged upon receipt of package. Included in every package should be:
(1) preliminary operating manual, (1) packet of mounting screws, (1) registration card. It is a good
idea for you to retain the packaging (box & foam case) in case there is a need to return the unit
for service or repair at a later date.
• SERVICE/REPAIR - WARNING: With the exception of tube replacement (see below) the user should
NOT attempt to service this unit in any way, due to the risk of electrical shock and the presents of
lethal voltages inside the 583. The user should also take note that excessive ‘swapping’ of tubes will
Introduce undue wear on the tube socket. It is therefore recommended that tube replacement be
performed only when necessary and by technically competent individuals.
Tube replacement: Turn power supply off and remove 583 from the chassis, wait five minutes to allow
the vacuum tube to cool before attempting to remove it. Using your fingers, apply a slight circular/
rotating motion as you pull it away from the socket. It is important to replace the tube with the same
type. When a replacement tube is installed double check that you’ve inserted the correct tubes into
the 583’s tube socket BEFORE powering up.
WARNING: Warranty may rendered void if tubes other than those listed above have been used at
any time.