Manley Labs Stereo Amplifier STUDIO STANDARD 350 WATT MONOBLOCK AMPLIFIER User Manual

MANLEY  
LABORATORIES, INC.  
OWNER'SMANUAL  
STUDIO STANDARD  
350 WATT MONOBLOCK  
AMPLIFIER  
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INTRODUCTION  
THANK YOU!...  
for choosing the Manley Laboratories Studio Standard 350 watt monoblock amplifiers. Designed  
around the concept that less is more, the Studio Standard 350 uses the best available parts with the  
shortest, cleanest, signal path possible. With the use of our own C.N.C. milling machine, we can  
provide you with a superb sounding machine with elegant packaging. Please take a few moments to  
read through this manual, there may be features and information about this amplifier that you do not  
know, and it is in your, and our here at Manley Labs, best interest that you do.  
Thank you again, and please enjoy!  
GENERAL NOTES  
LOCATION&VENTILATION  
The Studio Standard 350 watt monoblocks must be installed in a stable location with ample ventilation.  
Allow a minimum of 2 inches of clearance on the top and sides of the amplifier, such that a constant  
flow of air can flow throught the ventilation openings. We also recommend that the amplifier if driven  
by a preamplifier be placed at least 10 inches apart. Do not place amplifiers directly on high pile carpet  
or any other surface that will block the ventilation vents.  
WATER&MOISTURE  
As with any electrical equipment, this amplifier should not be used near water or moisture. If liquid  
enters the amplifier, it must be immediately returned to your deal for servicing.  
SERVICING  
The user should not attempt to service the amplifier beyond that described in the owner's manual.  
Refer all servicing other than biasing and tube replacement to Manley LAboratories  
SPECIALNOTES  
Tubes may become loose during transit. Straighten and press down each tube before plugging the  
amplifier into the mains socket. Furthermore, NEVER touch the tubes after the amplifier has been  
switched on, the tubes become very hot during operation and should only be handled after the power  
has been turned off and the tubes have cooled.  
WARNING!  
!
TOPREVENTTHERISKOFELECTRICSHOCK  
DO NOT OPEN THE CABINET  
REFERSERVICINGTO  
QUALIFIEDPERSONEL  
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MAINS CONNECTIONS  
The Manley Laboratories Studio Reference 350 watt monoblocks requires a significant amount of AC  
current to operate properly. For best operation, plug the amplifier directly into the wall outlet, avoiding  
extension cords and other devices which restrict the current supply to amplifier. If extension cables are  
required, be certain that they are high quality, heavy duty (14-12 guage) cables.  
Your amplifier 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  
BLUE  
BROWN  
EARTH  
NEUTRAL  
LIVE  
terminal  
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 CONNEC-  
TIONS HAVE BEEN MADE.  
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CONNECTING YOUR AMPLIFIER  
Setting up your amplifier is rather easy.  
1. Connect all source components (turntable, CD, Tuner, Tape DAT, etc.) to your preamplifier.  
2. Connect the interconnects from the output of the preamplifier or switching center to RCA  
input.  
3. Connect the hot or "+" speaker cable to the top binding post and the common or "-" speaker  
cable to the bottom binding post (See diagarm III). Ensure that the other end of the cable is  
connected correctly to the speaker. Tighten the binding posts by hand. If you use a nut-  
driver (3/8") do not over-tighten the posts or you may breaak the connection inside the  
amplifier.  
4. Turn on Preamplifier and any source components you plan to use.  
5. Ensure that the "mains" switch on the front panel is in the "off" or "0" position.  
6. Plug amplifier into wall outlet.  
7. Turn on one amplifier at a time so as not to trip a circuit breaker or blow a fuse.  
8. Turn up the volume and enjoy.  
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BIAS PROCEDURES  
The Manley Studio Standard 350 is a fixed bias system that requires very little attention. If you wish to  
adjust or check the bias, follow the following steps.  
1.  
On diagram 1, which depicts the front panel of the Manley 350, you can see two measurement  
tip jacks labled "READ BIAS". Place the probes of a standard volt meter in these sockets and set the  
volt metertoread 'millivolts'.  
2.  
Directly below these tip jacks is a knob labeled with sixteen points. Since the Manley Studio  
Standard 350 only has 8 output tubes, only half of these sixteen positions can be obtained. The switch  
when set at 1 o'clock will read output tube ones's voltage drop across the cathode resistor. Simularly,  
as you continue clockwise you will continue until you reach tube eight's bias voltage.  
3.  
On diagram 2, which depicts the top view of the Manley 350, you will see the tube numbering  
sequence and the bias adjust pots used to alter the bias of each tube.  
4.  
The first step to setting the bias is to turn on the amplifier and ensure that there is zero signal  
input. Also, leave your loadspeakers connected as these provide an ideal load on the output. It is  
recommended that tha you leave the amplifier on long enough to ensure that the tubes have reached  
theirstablecurrentdraw.  
5.  
Set the switch to the one o'clock position and adjust the first trim pot (furthest left) until you  
measure 300 to 350 mV. Since you are measuring across a 10 ohm cathode resistor, this would  
correspond to 30 to 35 mA of bias current.  
6.  
If you are unable to bring the bias down to 30 to 35 mA on any tube then we recommend that  
the tube be carefully watched or replaced.  
7.  
Follow step five with the remaining tubes. Once they are all set, your amplifier should be in  
perfectoperation.  
NOTE: There are two red tip jacks and one pot on the top of the amplifier which should not be  
altered. These tip jacks are used to measure the AC balance which is factory set and should never need  
adjustment.  
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OPERATIONAL NOTES  
SWITCHINGON  
The power switch is located on the lower right hand corner of the front panel. Push the top of the  
rocker switch (1) to turn on the amplifier and the bottom of the rocker to turn off the amplifier.  
With monoblocks we suggest that you turn on one amplifier first allowing about thirty seconds to pass  
before powering the other one. Also, ALWAYS turn ON your preamplifier or consule FIRST and let  
this settle before turning on the amplifiers.  
RUNNING  
It is not recommended that you leave your amplifier permanently switched on. This only wastes  
electricity and tube life. Your amplifier has solid state rectification and reaches peak operating  
condition in approximately 30 minutes.  
TUBELIFE  
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 amplifier checked every 3-4 years, depending  
on usage, usually the amplifier will require re-tubing after this time has elapsed.  
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SPECIFICATIONS  
VacuumTubes:  
8 x 6550, 1 x 6350, 1x 12AT7  
OutputPower  
20 Hz - 20 KHz, 4 Ohm Load  
380 W 3%T.H.D. feedback MAXIMUM  
376 W 3%T.H.D. feedback STANDARD  
360 W 3%T.H.D. feedback MINIMUM  
SlopeAdjustment  
20 KHz, (Ref. to 0dB @ 1K)  
+1 dB  
+0.97 dB  
+0.88 dB  
slope=MINIMUM  
slope=STANDARD  
slope=MAXIMUM  
InputSensitivity  
Full power, feedback  
MAX  
STAND  
MIN  
1.8  
Vrms  
1.44 Vrms  
1.2  
Vrms  
InputImpedance  
LoadImpedance  
82 Kohm  
5 ohm / 2.5 ohm  
S/N Ratio @350W  
feedback  
MIN.  
STAND.  
MAX  
-90.69 dB (120Hz)  
-91.90 dB (120Hz)  
-93.70 dB (120Hz)  
PowerConsumption  
Mains Fuse  
300 W Quiescent  
900 W FullPower  
100, 110, 120V  
220, 240 V  
= 10A (Slo-Blo)  
= 5A (Slo-Blo)  
B+ Fuse  
1.5 A  
Dimensions  
Weight  
W=19, D=10, H=8.5 inches  
75 lbs  
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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.  
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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 warrenty 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 to use Manley Laboratories.  
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 ___________________  
________________________________________________________________  
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NOTES  
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