Manley Laboratories Langevin pre Owners manual

MANLEY

LABORATORIES, INC.

OWNER'S MANUAL

ALL-DISCRETE LINE

PREAMPLIFIER

CONTENTS

SECTION PAGE

INTRODUCTION 3

MAINS CONNECTIONS 4

FRONT PANEL 5

REAR PANEL 6

OPERATIONAL NOTES 7

WARRANTY 8

WARRANTY REGISTRATION 9

NOTES 10



INTRODUCTION

THANK YOU!...

for choosing the Manley Laboratories Langevin Line Preamplifier. The Langevin Line
Preamplifier, designed in ALL-DISCRETE CLASS A CIRCUITRY, utilizes only the best modern
componentry, such as conductive plastic potentiometers, military-grade sealed gold contact switches,
and precision 1% metal film resistors. The Langevin Line Preamplifier also contains a fully
regulated power supply and very low noisetransistors in conjunction with short direct signal traces to
provide the cleanest audio signal possible.
Please take a few moments to read through this manual carefully as it contains information essential
to proper operation of this unit.

Thank you again, and please enjoy!

GENERAL NOTES

LOCATION & VENTILATION

The Langevin Line Amplfiier must be installed in a stable location with ample ventilation. It is
recommended, if this unit is rack mounted, that you allow enough clearance on the top and bottom of
the unit such that a constant flow of air can flow through the ventilation vents.

WATER & MOISTURE

As with any electrical equipment, this equipment should not be used near water or moisture. If
liquid enters the preamplifier, it must be immediately returned to your deal for servicing.

SERVICING

The user should not attempt to service this unit beyond that described in the owner's manual. Refer
all servicing to Manley Laboratories.

WARNING!

!

TO PREVENT THE RISK OF ELECTRIC SHOCK

DO NOT OPEN THE CABINET

REFER SERVICING TO

QUALIFIED PERSONEL

MAINS CONNECTIONS

Your unit has been factory set to the correct mains voltage for your country. The voltage setting is
marked on the serial badge, located on the rear panel. Check that this complies with your local
supply.

Export units for certain markets have a moulded mains plug fitted to comply with local requirements.
If your unit does not have a plug fitted the coloured wires should be connected to the appropriate plug
terminals in accordance with the following code.

GREEN/YELLOW EARTH terminal
BLUE NEUTRAL terminal
BROWN LIVE terminal

As the colours of the wires in the mains lead may not correspond with the coloured marking identifying
the terminals in your plug proceed as follows;

The wire which is coloured GREEN/YELLOW must be connected to the terminal in the plug which is
marked by the letter E or by the safety earth symbol or coloured GREEN or GREEN and YELLOW.

The wire which is coloured BLUE must be connected to the terminal in the plug which is marked by
the letter N or coloured BLACK.

The wire which is coloured BROWN must be connected to the terminal in the plug which is marked by
the letter L or coloured RED.

DO NOT CONNECT/SWITCH ON THE MAINS SUPPLY UNTIL ALL OTHER CONNEC­TIONS HAVE BEEN MADE.

OFF

PROGRAM

MUTE

BALANCE

VOLUME

POWER ON

AUX

CD

TAPE

TUNER

VIDEO

ALL-DISCRETE PREAMPLIFIER

A

B C D E F

FRONT PANEL

A BALANCE Provides 10 dB of swing between left and right channels. To

increase the volume of th Left channel turn control counter-clock­wise from center position. To increase the volume of the Right
channel turn control clock-wise from ceter position.

B VOLUME Continuously variable input attenuator. Simultaneously varies the

input level to both channels of the selected signal.

C INPUT SELECT Selects between: AUX, CD, TAPE, TUNER, and VIDEO. (Phono

selection available on Langevin Phono version only)

D PROGRAM/MUTE Selects between program and mute. In the mute position, the audio

signal is shorted at the input of the line amplifier.

E POWER LED Illuminates when unit is powered on.

F POWER SWITCH Switch up to power ON the unit, down to power OFF the unit.

REAR PANEL

K AUX INPUT Line level AUX input

BCDEFGHIJ

FUSE

CIRCUIT
CHASSIS

GROUND

O

O
U
T
P
U

T

O

U

T

R
E
C

A

V

T

I
D
E

T

U
N
E
R

C

A

D

P
E

A
U
X

K

A IEC MAINS SOCKET Accepts standard 50/60 Hz AC mains voltage.

B DAISY CHAIN (If provided) The incoming AC mains voltage is paralleled via this IEC

plug and can power another unit simultaneously.

C FUSE HOLDER To remove the fuse, push and turn the fuse holder cap. A

1 to 3 Amp SLO-BLO fuse is recommended.

D CIRCUIT, CHASSIS GROUND TERMINALS Grounding terminal for both chassis and circuit. Connect

together to link circuit and chassis grounds, or remove to
help isolate ground loops.

E MAIN OUTPUT LEFT (white) and RIGHT (red) amplified outputs of

selected input.

F RECORD OUTPUT Paralled output of selected input. As this is a non-

buffered output, it is recommended to connect these
outputs to your tape deck only while actually recording.

G VIDEO INPUT Line level VIDEO input

H TUNER INPUT Line level TUNER input

I TAPE INPUT Line Level TAPE input

J CD INPUT Line level CD input

OPERATIONAL NOTES

SWITCHING ON

The power switch is located on the right hand corner of the front panel. Flip the switch up to turn on
the unit and down to turn off the unit.

GAIN ADJUSTMENT

Your Langevin preamplifier has been factory calibrated for optimal gain of 15 dB in the line stage.
Should you need to change the gain, we recommend using quality test equipment which should
include an oscillator, VTTM, oscilloscope, or suitable DMM. You will find the blue internal gain
adjust potentiometers located on the prited circuit board inside the unit, one for each channel.

SPECIFICATIONS

WARRANTY

All Manley Laboratories equipment is covered by a limited warranty against defects in materials
and workmanship for a period of 90 days from date of purchase to the original purchaser only. A
further optional limited 5 year warranty is available to the original purchaser upon proper
registration of ownership within 30 days of date of first purchase.

Proper registration is made by filling out and returning to the factory the warranty card attached to
this general warranty statement, along with a copy of the original sales receipt as proof of the
original date of purchase. Only 1 card is issued with each unit, and the serial number is already
recorded on it.

If the warranty registration card has already been removed then this is not a new unit, and is
therefore not warranted by the factory. If you believe this to be a new unit then please contact the
factory with the details of purchase.

This warranty is provided by the dealer where the unit was purchased, and by Manley Laboratories,
Inc. Under the terms of the warranty defective parts will be repaired or replaced without charge,
excepting the cost of tubes. No warranty is offered on tubes, unless:

1. a Manley Laboratories preamplifier is used with a Manley Laboratories amplifier, and

2. the warranty registration card is filled out.
In such a case a 6 month warranty on tubes is available with the correct recording of the serial

number of the preamplifier on your warranty registration card.
If a Manley Laboratories product fails to meet the above warranty, then the purchaser's sole

remedy shall be to return the product to Manley Laboratories, where the defect will be repaired
without charge for parts and labour. The product will then be returned via prepaid, insured freight,
method and carrier to be determined solely by Manley Laboratories. All returns to the factory must
be in the original packing, (new packing will be supplied for no charge if needed), accompanied by
a written description of the defect, and must be shipped to Manley Laboratories via insured freight
at the customer's own expense. Charges for unauthorized service and transportation costs are not
reimbursable under this warranty, and all warrantees, express or implied, become null and void
where the product has been damaged by misuse, accident, neglect, modification, tampering or
unauthorized alteration by anyone other than Manley Laboratories.

The warrantor assumes no liability for property damage or any other incidental or consequental
damage whatsoever which may result from failure of this product. Any and all warrantees of
merchantability and fitness implied by law are limited to the duration of the expressed warranty.
All warrantees apply only to Manley Laboratories products purchased and used in the USA.

Some states do not allow limitations on how long an implied warranty lasts, so the above
limitations may not apply to you. Some states do not allow the exclusion or limitation of incidental
or consequential damges, so the above exclusion may not apply to you.

This warranty gives you specific legal rights and you may also have other rights which vary from
state to state.

WARRANTY REGISTRATION

We ask that you please fill out this registration form and send the bottom half to:

MANLEY LABORATORIES
REGISTRATION DEPARTMENT
13880 MAGNOLIA AVE.
CHINO CA, 91710

Registration entitles you to product support, full warranty benefits, and notice of product
enhancements and upgrades. You MUST complete and return the following to validate your
warranty and registration. Thank you again for choosing Langevin.

MODEL ____________________ SERIAL No. ______________________

PURCHASE DATE ______________ SUPPLIER ______________________

--------------------------------------------------------------------------------------------------------

PLEASE DETACH THIS PORTION AND SEND IT TO MANLEY LABORATORIES

MODEL ____________________ SERIAL No. ______________________

PURCHASE DATE ______________ SUPPLIER _______________________

NAME OF OWNER _______________________________________________

ADDRESS ______________________________________________________

CITY, STATE, ZIP ________________________________________________

TELEPHONE NUMBER ___________________________________________

Serial #'s of Associated Manley Laboratories Equipment ___________________

________________________________________________________________

NOTES