Manley Labs Stereo Amplifier 100 WATT STEREO AMPLIFIER User Manual

MANLEY  
LABORATORIES, INC.  
OWNER'SMANUAL  
MANLEY 100 WATT  
STEREO AMPLIFIER  
MANLEY LABORATORIES, INC.  
13880 MAGNOLIA AVE.  
CHINO, CA. 91710  
TEL: (909) 627-4256  
FAX: (909)628-2482  
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INTRODUCTION  
THANK YOU!...  
for choosing the Manley Euro 100 Stereo Amplifier. Designed by David Manley, the Manley Euro 100 Stereo  
Amplifier uses only the best available components, with the shortest and cleanest signal path possible, and with the  
use of our own milling equipment we can provide you with a amplifier that looks as good as it sounds. For this  
amplifier design, we have chosen an interesting Russian military tube, the GammaY50. The circuit and the  
components used have been chosen carefully after years of development and refinement for reliability, constancy  
and most importanly, musical, accurate, and emotional delivery of the sound. The circuit topology is similar to  
other designs in the MANLEY range. This amplifier is configured for ULTRALINEAR or "partial-triode"  
operation which achieves the seductive quality of triode operation without the inefficiency and sacrifice in power  
of triode operation. We emphasize big, beefy resevoir capacitors in the high voltage supplies giving plenty of  
instant energy for dynamic performance of transient peaks and bass performance which often exceeds that of rival  
solid-state amplifiers. We run high voltages on the plates of the output tubes and are thus able to run them at lower  
current which will result in longer life for the output tubes. Each output tube has its own bias adjust, and the  
procedure for adjusting each tube's current draw is described in this manual. The output transformer has been  
factory set in series-parallel for an optimum 5 ohm load which will drive most speakers. Other output impedances  
can be achieved by changing the configuration of the transformer secondary. Please contact us at the factory should  
you need to do this.  
Thank you again, and please enjoy!  
GENERAL NOTES  
LOCATION & VENTILATION  
The Manley Stereo 100 Amplifier 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 amplifiers, such that constant movement of air can flow. Do  
not place amplifiers directly on high pile carpet or any other surface that will block the ventilation holes  
underneath the amplifiers. If you have small children or pets, you should consider placing the amplifiers out of  
reach or using the optional cages (covers) available as an option to prevent damage to the amplifier or damage to  
your small children or pets by the amplifier as the tubes do get hot during operation.  
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  
SPECIAL NOTES  
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!  
!
TO PREVENT THE RISK OF ELECTRIC SHOCK  
DO NOT OPEN THE CABINET  
REFER SERVICING TO  
QUALIFIED PERSONEL  
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MAINS CONNECTIONS  
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 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.  
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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 the RCA input on the top rear of the amplifier.  
3. Connect the hot or "+" speaker cable to the red binding post and the common or "-  
" speaker cable to the black binding post (See diagarm 2). 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. Ensure that the "mains" switch on the front panel is in the "off" or "0" position.  
5. Turn on Preamplifier and any source components you plan to use.  
6. Plug amplifier into wall outlet.  
7. Turn on the amplifier and allow it a minute or so to 'warm up' before playing any  
audio signal.  
8. Turn up the volume and enjoy.  
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BIAS PROCEDURES  
The Manley Euro Stereo 100 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 2, which depicts the top panel of the amplifier, you can see 4 black tip jacks  
and 1 green tip jack. To measure the current draw of each output tube place the positive probe  
(red) into the black tip jack for the tube you wish to measure and the negative probe (black) in  
the green (GROUND) tip jack and set the meter to read 'millivolts'.  
2.  
Each of the four (4) output tubes can have its own bias adjusted by altering its own bias  
adjust pot. On diagram 2, you can see the numbering sequence for the 4 output tubes, the  
corresponding tip jack (measurement point) and bias adjust pot.  
3.  
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 you leave the amplifier on long enough to ensure that the tubes  
have reached their stable current draw.  
5.  
Place the probes in the first black tip jack (negative probes remains in the green tip jack  
for whole biasing proceedure) and adjust the first bias trip pot (see diagram 2) until you measure  
300 to 350 mV. Since you are measuring across a 10 ohm cathode resistor, this would  
correspond to a 30 to 35 mA bias current.  
6.  
If you are unable to bring the bias voltage down to 300 to 350 mV 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  
Whenever replacing an output tube, or when retubing the unit, use  
be in perfect operation.  
tubes of the same type and quality as was fit by the factory. Watch and adjust the bias for the  
specific output tube or tubes you are replacing as soon as you turn on the amplifier, then check  
again after a half hour, and again in a few hours. Should you have any questions, or wish to  
purchase approved tubes from us here at Manley Labs, please do not hestitate to call.  
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OPERATIONAL NOTES  
SWITCHING ON  
The power switch is located on the lower left 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.  
The LED on the right side of the front panel will illuminate indicating that the amplifier is  
operating.  
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.  
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 amplifier checked every 3-4  
years, depending on usage, usually the amplifier will require re-tubing after this time has  
elapsed.  
PANEL LAMP  
The lamp which illuminates the front panel insert is easily replacable should it ever burn out. To  
replace it use only the same type with the same or greater voltage rating. In these amplifiers, the  
lamp is a FUSE LAMP STYLE 8V 0.15mA. Dimensions are 1/4" x 1 1/4". To replace the  
lamp, first turn off the amplifier and unplug the power cord!  
Remove the bottom cover and locate the lamp holder which sets behind the pront panel insert.  
Do not touch any other components inside the amplifier as high voltages may be present even  
after the amplifier is unplugged, sometimes for weeks! Carefully pry out the old lamp from the  
clips and firmly replace with the new lamp of the same type and rating. Replace the bottom  
cover after you are through.  
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SPECIFICATIONS  
Vacuum Tubes:  
4 x GY50 (Output), 2 x 6350 (Driver), 2 x 12AT7 (Input)  
Output Power  
88 Watts @1Khz 1.5%THD, into 5 ohms  
Frequency Response, +/- .5 dB  
Input Sensitivity  
10 Hz - 35 KHz  
800 mV  
Input Impedance  
100 KOhm  
5 Ohm  
Load Impedance  
S/N Ratio @350W  
Power Consumption  
-80 dB  
220 Watts  
420 Watts  
Quiescent  
Full Power  
Mains Fuse  
B+ Fuse  
100, 110, 120V  
220, 240 V  
6 A (Slo-Blo)  
3 A (Slo-Blo)  
1A  
Dimensions  
Weight  
W=19, D=13, H=7 inches  
46 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 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 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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