Digital Audio Labs LACHAPELL AUDIO 983S MK2 Manuale d'uso - Pagina 5
Sfoglia online o scarica il pdf Manuale d'uso per Amplificatore Digital Audio Labs LACHAPELL AUDIO 983S MK2. Digital Audio Labs LACHAPELL AUDIO 983S MK2 12. Wo channel vacuum tube preamplifier for microphones and instruments
Stampa la paginaINTRODUCTION
The LaChapell Audio 983S MK2 is a two channel microphone and instrument preamplifier. Each
channel consists of a Jensen input transformer with a turns ratio of 1:10 and one ECC83/12AX7 vacuum
tube. The instrument input stage is 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 with very low 8 ohm output impedance.
With this precision, double-balanced output stage, the 983S MK2 is capable of driving many hundred
of feet of cable without significant less of signal quality
BEFORE YOU GET STARTED
Please take time to read the information below before installing the LaChapell Audio 983S MK2.
• 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: The user should NOT attempt to service this unit in any way, due to the
risk of electrical shock and the presence of lethal voltages inside the 983S MK2. It is recommended
that tube replacement be performed only when necessary by technically competent individuals.
Tube replacement: Turn power supply off and remove 983S MK2 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, ensure that the
correct tube type has been inserted into the 983S MK2's tube socket BEFORE powering up.
• MOUNTING: Always allow for plenty of ventilation around the sides and top of preamp. Mounting
in travel racks is 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. The 983S MK2
should never be mounted or placed in areas that would expose it to any form of moisture.
• 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 983S MK2. 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 off, disconnect the power cable and wait 20 minutes
to allow the vacuum tube to cool before attempting to remove it. Waiting 20 minutes
also allows the power supply caps to discharge adequately. Using your fingers, apply a slight
circular/rotating motion as you pull the tube away from the socket. It is important to replace
the tube with the same type of tube.
WARNING: Warranty may be voided if tubes other than the 12AX7/ECC83 are used.
LACHAPELL AUDIO MODEL 983S MK2
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