background image

LACHAPELL AUDIO MODEL 983S MK2

SAFETY INSTRUCTIONS

TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER. CONTACT DIGITAL AUDIO LABS 

FOR  SERVICING.

The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user 
to the presence of uninsulated and/or potentially dangerous voltage within the products enclosure 
that may be of sufficient magnitude to constitute a risk of electric shock to persons.

The exclamation point within an equilateral triangle is intended to alert the user to the presence of 
important operating and maintenance (servicing) instructions in the literature accompanying the 
appliance.

POWER CORD NOTICE FOR INTERNATIONAL OPERATION
Please call Digital Audio Labs Support at 952-401-7700.

IMPORTANT SAFETY INSTRUCTIONS

1.  Read and understand this entire manual.
2.  Keep this manual available for reference.
3.  Heed all warnings and precautions in this manual and notices marked on the product.
4.  Do not use this product near water or damp environments.
5.  Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.
6.  Provide for proper airflow around product. Do not install near products that produce high levels 

of heat. Do not expose the unit to direct sun light or heating units as the internal components 
temperature may rise and shorten the life of the components. 

7.  Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two 

blades with one wider than the other. A grounding type plug has two blades and a third grounding 
prong. 

8.  Protect the power cord from being walked on or pinched particularly at plugs, convenience 

receptacles, and the point where they connect to the product. Do not use the unit if the electrical 
power cord is frayed or broken.

9.  Only use attachments/accessories specified by the manufacturer.
10.  Unplug this product during lightning storms or when unused for long periods of time.
11.  Refer all servicing to qualified service personnel. 
12.  The product shall not be exposed to moisture. Do not touch the unit with wet hands. Do not handle 

the unit or power cord when your hands are wet or damp. 

13.  The product should be connected to a power supply only of the type described in the operating 

instructions or as marked on the product.

CARE

•  From time to time you should wipe off the front and side panels and the cabinet with a dry soft 

cloth. Do not use rough material, thinners, alcohol or other chemical solvents or cloths since this may 
damage the finish or remove the panel lettering.

•  The manufacturer cannot be held responsible for damages caused to persons, personal possessions, 

or data due to an improper use of product.

Summary of Contents for LACHAPELL AUDIO 983S MK2

Page 1: ...oad Chanhassen MN 55317 952 401 7700 support digitalaudio com www digitalaudio com LACHAPELL AUDIO 983S MK2 USER GUIDE Two Channel Vacuum Tube Preamplifier for Microphones and Instruments Version 1 Fe...

Page 2: ...o direct sun light or heating units as the internal components temperature may rise and shorten the life of the components 7 Do not defeat the safety purpose of the polarized or grounding type plug A...

Page 3: ...the product to the place of purchase Please write the RMA number on the outside of the shipping carton Any product sent to us without a valid RMA number will be refused Include the following with the...

Page 4: ...LIMITED WARRANTY 1 REPAIR POLICY 1 WARRANTY SERVICE 1 NON WARRANTY SERVICE 1 INTRODUCTION 3 BEFORE YOU GET STARTED 3 SAFETY PRECAUTIONS 4 CONTROLS 5 CONTROL DETAILS 5 GETTING STARTED 6 983 FREQUENCY R...

Page 5: ...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 y...

Page 6: ...ating any existing vent s is not recommended Never position the 983S MK2 directly above other heat generating sources such as a power amplifier Do not place the 983S MK2 in an area where there is a po...

Page 7: ...erses the polarity of the output signal MUTE Output level mute The MUTE LED will illuminate red when the channel is muted VU METER This detects the microphone input signal not output level The LED is...

Page 8: ...C power supply to the AC POWER IN Press it until it locks into place To disconnect the power supply press the locking mechanism on the AC POWER connector MIC INPUT This XLR connects to the microphone...

Page 9: ...microphone type TUBE HARMONICS AND COMPRESSION With the TUBE DRIVE set at around 75 LEVEL around 25 and the PAD off you will get incredible tube harmonics and natural tube compression This would be a...

Page 10: ...LACHAPELL AUDIO MODEL 983S MK2 8 983S MK2 FREQUENCY RESPONSE HPF 150HZ LPF 10KHZ HPF 50HZ LPF 5KHZ...

Page 11: ...in 27 8dBu 1 THD N 22Hz 20kHz Frequency Response 9Hz 40kHz THD N Variable 0 01 18 per tube drive input gain control with 40dBu input at 1Khz Noise EIN 124dB S N Ratio 92dB 30dB of gain 22Hz 20kHz Inpu...

Page 12: ...2014 2015 Digital Audio Labs 2017 2018 Digital Audio Labs Patents pending...

Reviews: