Manley Labs Stereo Amplifier CONTROL MASTER PREAMPLIFIER User Manual

MANLEY  
LABORATORIES, INC.  
OWNER'S MANUAL  
CONTROL MASTER  
PREAMPLIFIER  
MANLEY LABORATORIES, INC.  
13880 MAGNOLIA AVE.  
CHINO, CA. 91710  
TEL: (909) 627-4256  
FAX: (909) 628-2482  
 
INTRODUCTION  
THANK YOU!...  
for choosing the Manley Laboratories CONTROL MASTER Preamplifier. Designed by David Manley,  
the Mastering Room LINE Preamplifier uses the best available parts with the shortest, cleanest, signal  
path possible. With the use of our own in-house C.N.C. milling machine, we can provide you with a  
superb sounding machine with elegant packaging. The design is completely DUAL-MONO with  
separate power supplies for each channel including two custom designed power transformers. The audio  
boards are also separate. All the wiring from the rear input connectors to the front selector switch and  
precision custom stepped attenuator is painstakingly hand wired using professional studio twisted pair  
shielded six-9's copper cable for optimum shielding and lo-noise characteristics, and although it would  
be much cheaper, easier, and faster to simply put these leads on several feet of printed circuit board  
traces like most everybody else does, we opt for purity of sound however many more hours it takes. The  
high-current line amplifier circuit employed here is one we have developed and refined over the years in  
our MANLEY Professional series. We hope you agree with us and hundreds of satisfied users and  
studios around the world that this circuit really delivers. Please take a few moments to read through this  
manual, there may be features and information about this preamplifier which you should familiarise  
yourself with.  
Thank you again, and please enjoy!  
GENERAL NOTES  
LOCATION & VENTILATION  
The CONTROL MASTER preamplifier 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 preamp such that a constant flow of air can flow through the ventilation slots. We also recommend  
that the preamplifier be placed at least 10 inches away from its amplifier.  
WATER & MOISTURE  
As with any electrical equipment, this preamplifier should not be used near water or moisture.  
SERVICING  
The user should not attempt to service the preamplifier beyond that described in the owner's manual.  
Refer all servicing other than tube replacement to Manley Laboratories.  
SPECIAL NOTES  
Tubes may become loose during transit. Straighten and press down each tube before plugging the  
preamplifier into the mains socket. Furthermore, do not touch the tubes after the preamplifier has been  
switched on, as the tubes do become very hot during operation and should only be handled after the  
power has been turned off and the tubes have cooled.  
WARNING!  
!
TO PREVENT THE RISK OF ELECTRIC SHOCK  
DO NOT OPEN THE CABINET  
REFER SERVICING TO  
QUALIFIED PERSONEL  
 
MAINS CONNECTIONS  
Your preamplifier 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 com-  
plies with your local supply.  
Export units for certain markets have a moulded mains plug fitted to comply with local require-  
ments. 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  
BLUE  
BROWN  
EARTH  
NEUTRAL terminal  
LIVE terminal  
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 CON-  
NECTIONS HAVE BEEN MADE.  
 
CONNECTING YOUR PREAMPLIFIER  
Setting up your preamplifier is rather easy.  
1. Please refer to page 7 diagram 2 for an illustration of the back of the preamplifier.  
2. There are two sets of main outputs, one set UNBALANCED RCA  
and the other BALANCED XLR. The pin out for the XLR is as follows:  
PIN1 - ground  
PIN2 - POSITIVE going phase (+)  
PIN3 - NEGATIVE going phase (-).  
Connect either (or both for bi-amping) the XLR or RCA output to the input of your ampli-  
fier as required.  
3. UNBALANCED inputs are found on RCA jack inputs and can be connected to any line  
level sources devices.  
4. A pair of 3 pin BALANCED XLR INPUT is standard and can be used with a balanced  
source. The pin out for the XLR is as follows:  
PIN1 - ground  
PIN2 - POSITIVE going phase (+)  
PIN3 - NEGATIVE going phase (-).  
5. The record output is not buffered and it is recommended that one have the tape feed  
plugged into the REC OUT only when actually recording. Care should be used when  
using a 3-head tape/monitor switch as this recout is not a tape loop.  
5. On the left end of the back panel is a standard IEC mains connector. This should be  
connected to a standard 120 or 240 volt outlet.  
6. Be certain that the voltage selector switch located next to the IEC mains socket is set  
for your voltage!!!  
7. Power up the preamplifier FIRST and allow it to settle for a minimum of 30 seconds  
before powering up your amplifiers. Turn off your preamplifier and source components  
LAST when powering down a system.  
 
FRONT PANEL  
VOLUME  
OPERATE  
XLR  
BALANCE TRIM  
AUX  
DIG  
TAPE  
TUNER  
VIDEO  
MUTE  
LEFT  
RIGHT  
A
B C  
D
E F  
A
SELECTOR SWITCH Switch to select between inputs. Counterclockwise:  
BALANCED XLR INPUTS, AUX (auxilary), DIG (CD), TAPE, TUNER, VIDEO.  
NOTE: always turn volume control (level) down before switching selector switch to  
avoid surprisedifferences in source levels. NOTE: inputs which have nothing plugged  
in to them can pick up noise.  
B
C
VOLUME CONTROL Adjust the stereo input level of the selected signal.  
MUTE / OPERATE SWITCH Switch DOWN mute the selected input to the  
preamplifier.  
D
BALANCE ADJUSTS These very useful controls modify the gain of each channel  
by changing the line amplifier's feedback. When set to 12 o'clock (straight up) both  
channels will produce the same gain at optimum setting. Rotating the controls  
clockwise will increase the gain (lower feedback) and rotating the controls  
counterclockwise will reduce the gain (more feedback) of the corresponding channels  
with approximately 10 dB of total swing. Thus neither control will fully mute the  
signal. Different sound characteristics can be achieved with these controls to optimise  
the gain, speed, and slew rate of this preamplifier to your system, but small  
differences of level between two channels can be equalled or trimmed out with these  
controls when used as dual-mono balance controls.  
E
F
LED POWER INDICATOR Illuminates when the preamplifier is powered on.  
POWER SWITCH Switch up to turn on the power, down to turn the power off. Do  
not ever flip the power on and off and on and off rapidly-- you can damage the power  
supply.  
 
REAR PANEL  
A B C  
D E F G H I J K L  
A
B
C
IEC MAINS SOCKET Standard IEC mains socket (120/240 VAC)  
FUSE HOLDERS Right & Left channel fuses. Replace with 1A SLO-BLO fuse only.  
VOLTAGE SELECTOR SWITCH Selectable to 110,120 / 220,240 VAC. Set to the proper  
voltage for your country.  
D
E
F
G
H
I
OUTPUT (XLR) Left (upper) and Right (lower) output XLR's. BALANCED  
OUTPUT (RCA) Paralled output to the Left and Right XLR outputs. UNBALANCED  
RECORD OUTPUT Set at input line stage level.  
VIDEO INPUT - Video, Line level input  
TUNER INPUT - Tuner, line level input  
TAPE INPUT - Tape, line level input  
J
DIG INPUT - CD, line level input  
K
L
AUX INPUT - AUX, line level input  
BALANCED XLR INPUTS  
 
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 preamplifier and down to turn off the preamplifier.  
RUNNING  
It is not recommended that you leave your preamplifier permanently switched on. This only  
wastes electricity and tube life. Your preamplifier has solid state rectification and reaches peak  
operating condition in approximately 30 minutes.  
TUBE LIFE  
As with all tubes, their quality degrades with age. This is due to cathode emission, a natural  
process found in all tubes. We recommend that you have your preamplifier checked every 4-5  
years, depending on usage. An excessive increase in noise level can indicate the need to replace  
a tube.  
 
SPECIFICATIONS  
Vacuum Tubes:  
2 x 5814's, 2 x 6414's  
Gain  
(line stage)  
6 dB  
Input Impedance  
100 Kohm  
120 ohms  
line stages  
Output Impedance  
Power Consumption  
33 Watts (275mA @ 120VAC)  
 
WARRANTY  
All Manley Laboratories equipment is covered by a limited warranty against defects in materials  
andworkmanshipforaperiodof90daysfromdateofpurchasetotheoriginalpurchaseronly.A  
furtheroptionallimited5yearwarrantyisavailabletotheoriginalpurchaseruponproper  
registrationofownershipwithin30daysofdateoffirstpurchase.  
Properregistrationismadebyfillingoutandreturningtothefactorythewarrantycardattachedto  
this general warranty statement, along with a copy of the original sales receipt as proof of the  
originaldateofpurchase. Only1cardisissuedwitheachunit, andtheserialnumberisalready  
recordedonit.  
Ifthewarrantyregistrationcardhasalreadybeenremovedthenthisisnotanewunit, andis  
therefore not warranted by the factory. If you believe this to be a new unit then please contact the  
factorywiththedetailsofpurchase.  
Thiswarrantyisprovidedbythedealerwheretheunitwaspurchased,andbyManleyLaboratories,  
Inc. Underthetermsofthewarrantydefectivepartswillberepairedorreplacedwithoutcharge,  
exceptingthecostoftubes.Nowarrantyisofferedontubes,unless:  
1.aManleyLaboratoriespreamplifierisusedwithaManleyLaboratories amplifier,and  
2. thewarrantyregistrationcardisfilledout.  
In such a case a 6 month warranty on tubes is available with the correct recording of the serial  
numberofthepreamplifieronyourwarrantyregistrationcard.  
IfaManleyLaboratories productfailstomeettheabovewarranty,thenthepurchaser'ssole  
remedyshallbetoreturntheproducttoManleyLaboratories, wherethedefectwillberepaired  
withoutchargeforpartsandlabour.Theproductwillthenbereturnedviaprepaid,insuredfreight,  
methodandcarriertobedeterminedsolelybyManleyLaboratories.Allreturnstothefactorymust  
beintheoriginalpacking,(newpackingwillbesuppliedfornochargeifneeded),accompaniedby  
awrittendescriptionofthedefect,andmustbeshippedtoManleyLaboratoriesviainsuredfreight  
atthecustomer'sownexpense.Chargesforunauthorizedserviceandtransportationcostsarenot  
reimbursableunderthiswarranty,andallwarrantees,expressorimplied,becomenullandvoid  
wheretheproducthasbeendamagedbymisuse,accident,neglect,modification,tamperingor  
unauthorizedalterationbyanyoneotherthanManleyLaboratories.  
Thewarrantorassumesnoliabilityforpropertydamageoranyotherincidentalorconsequental  
damagewhatsoeverwhichmayresultfromfailureofthisproduct.Anyandallwarranteesof  
merchantabilityandfitnessimpliedbylawarelimitedtothedurationoftheexpressedwarranty.  
AllwarranteesapplyonlytoManleyLaboratoriesproductspurchasedandusedintheUSA.  
Somestatesdonotallowlimitationsonhowlonganimpliedwarrantylasts, sotheabove  
limitations may not apply to you. Some states do not allow the exclusion or limitation of incidental  
orconsequentialdamges,sotheaboveexclusionmaynotapplytoyou.  
Thiswarrantygivesyouspecificlegalrightsandyoumayalsohaveotherrightswhichvaryfrom  
state to state.  
 
WARRANTYREGISTRATION  
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 Manley Laboratories.  
MODEL CONTROL MASTER PREAMPLIFIER SERIAL No.MRL________  
PURCHASE DATE ______________ SUPPLIER ______________________  
--------------------------------------------------------------------------------------------------------  
PLEASE DETACH THIS PORTION AND SEND IT TO MANLEY LABORATORIES  
MODEL CONTROL MASTER PREAMPLIFIER SERIAL No.MRL________  
PURCHASE DATE ______________ SUPPLIER _______________________  
NAME OF OWNER _______________________________________________  
ADDRESS ______________________________________________________  
CITY, STATE, ZIP________________________________________________  
TELEPHONE NUMBER ___________________________________________  
COMMENTS OR SUGGESTIONS?__________________________________  
________________________________________________________________  
 

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