MANLEY
LABORATORIES, INC.
OWNER'S MANUAL
MANLEY REFERENCE
500 / 200 WATT
MONOBLOCK
MANLEY LABORATORIES, INC.
13880 MAGNOLIA AVE.
CHINO, CA. 91710 USA
TEL: (909) 627-4256
FAX: (909) 628-2482
email: [email protected]
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INTRODUCTION
THANK YOU!...
for choosing the Manley 500/200 Monoblock Amplifiers. Designed by David Manley, the Manley 500/
200 Monoblock Amplifiers use only the best available components, with the shortest and cleanest
signal path possible, and with the use of our own in-house CNC machine shop we can provide you with
a amplifier that looks as good as it sounds.
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 to switch between triode or tetrode operation which allows the user to choose between the
sonic benefits and seductive qualities of triode and the more powerful tetrode operation mode. 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. Careful use of the 'EVER-WARM'
power switching should also greatly increase the life of the output tubes as well as allow your
amplifiers to always be ready for pleasurable listening. Each output tube has its own bias adjust, and the
procedure for adjusting each tube's current draw is described in this manual. The FEEDBACK &
SLOPE controls featured on the 500/200 allow the user to optimise the amplifier-speaker interface.
The output transformer is a revolutionary new design by David Manley which is wound on the Manley
Labs factory premesis. Its stellar performance will be obvious upon first listening. The secret is in
keeping both phases of the push-pull halves always equal, and in this new output transformer design,
David has achieved just that. The output transformer has been factory set for an optimum 5 ohm load
which will drive most speakers.
Thank you again, and please enjoy!
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MAINS CONNECTIONS
GENERAL NOTES
LOCATION & VENTILATION
The Manley 440/200 Monoblock Amplifiers 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 a constant flow of air can flow.
Do not place amplifiers directly on high pile carpet or any other surface that will block the ventilation vents
underneath the amplifiers. If you have small children or pets, you should consider placing the amplifiers out of
reach 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, these amplifiers should not be used near water or moisture. If liquid enters the
amplifier, it must be immediately returned to your dealer 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, do not touch the tubes after the amplifier has been switched on, as the tubes
become very hot during operation and should only be handled after the power has been turned off and the tubes
have cooled.
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
EARTH terminal
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.
WARNING!
!
TO PREVENT THE RISK OF ELECTRIC SHOCK
DO NOT OPEN THE CABINET
REFER SERVICING TO
QUALIFIED PERSONEL
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CONNECTING YOUR AMPLIFIER
Setting up your amplifiers is rather easy.
1. Connect all source components (turntable, CD, Tuner, Tape DAT, etc.) to
your preamplifier.
2. If using an UNBALANCED output from your preamplifier, connect the
RCA interconnects from the output of the preamplifier or switching center to
the RCA input on the back of the amplifiers. Select the rear switch to the
UNBALANCED position.
3. If using a BALANCED output from your preamplifier, connect the 3 pin
XLR interconnects from the output of the preamplifier or switching center to
the XLR input on the back of the amplifiers. Select the rear switch to the
BALANCED position.
The pin out for the BALANCED input is as follows:
PIN 1: GROUND
PIN 2: POSITIVE GOING PHASE (+)
PIN 3: NEGATIVE GOING PHASE (-)
4. Please note: The correct input selection MUST be made.
3. Connect the hot or "+" speaker cable to the red binding post and the common
or "-" speaker cable to the black binding post. 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 break the connections inside the amplifier.
4. Ensure that the "mains" switch on the front panel is in the "off" or "0" posi-
tion and the OPERATE / STANDBY switch is in the STANDBY mode.
5. Turn on Preamplifier and any source components you plan to use.
6. Plug amplifier into wall outlet.
7. Switch the square mains power switch to the ON position and allow the
amplifier a minute or so to 'warm up'. The blinking LED will indicate that
the amplifier is in STANDBY mode.
8. Engage the soft-start swich to the OPERATE position. The blinking standby
LED will extinguish.
9. Turn up the volume and enjoy.
10. After your listening session, if you wish to leave the amplifier in the energy-
saving and 'EVER-WARM' STANDBY mode, engage the OPERATE/
STANDBY switch to the STANDBY position. The standby blinking LED
will remind you that the amplifier is in STANDBY mode.
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TOP VIEW
4
9
6414
6414
7
2
6
8
12AT7
10
3
5
1
Amplifier Overhead View
Tube Location
OUTPUT TUBES:10 x RUSSIAN 6550
The 6550's used are the Russian Svetlana 6550's. This has been proven to be the rugged and reliable of this type and
we strongly emphasize that only the RUSSIAN 6550's should be used in this amplifier. The MANLEY 440/200 WATT
MONOBLOCK has been thoroughly optimised around this tube. Use of unapproved tube types can and will void your warranty.
DRIVER TUBES: 2 x 6414
The 6414 is an American military uprated version of the 12BH7A with increased current drive.
INPUT TUBE: 12AT7WA
The 12AT7WA has several equivalent numbers, (12AT7, 12AT7A, 6201, ECC81, etc.) Any of these types may be
used. We have selected this 12AT7WA very carefully for noise, microphonics, and constancy. Replacement tubes of premium
quality are always available from MANLEY LABORATORIES.
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REAR VIEW
UNBALANCED
BALANCED
XLR
BALANCED
INPUT
RCA
UNBALANCED
INPUT
SPEAKER
OUTPUT
BINDING
POSTS
MAINS IN MAINS
B+ FUSE
SLO-BLO
IEC
FUSE
SLO-BLO
UNBALANCED
BALANCED
SELECT
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FRONT VIEW
READ BIAS
SLOPE
FEEDBACK
MINIMUM
STANDARD
MAXIMUM
OPERATE
STANDBY
TRIODE
MANLEY
DESIGNERS' REFERENCE SERIES
500 / 200 WATT MONOBLOCK
DESIGNED BY DAVID MANLEY
Handcrafted in Chino, California
TO SET BIAS REMOVE THIS COVER PLATE
TETRODE
POWER
LED
TRIODE
TETRODE
SWITCH
OPERATE
STANDBY
EVER-WARM
SOFT START
SWITCH
MAINS
POWER
ON / OFF
SWITCH
STANDBY
LED
(BLINKING)
READ BIAS
SLOPE
FEEDBACK
MINIMUM
STANDARD
MAXIMUM
1 2 3 4 5 6 7 8 9 10
FRONT VIEW OF AMPLIFIER
WITH BIAS COVER PLATE REMOVED
SHOWING BIAS ADJUST POTS
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BIAS PROCEDURES
The Manley 500/200 Monoblock Amplifiers uses a fixed bias system that requires very little
attention. We recommend checking the bias every 2-3 months or any time you replace an
output tube. To adjust or check the bias, follow the following steps.
For this procedure you will need a voltmeter (a hand held autoranging DMM digital
multimeter is the easiest) and a small flat screwdriver.
1.
On page 8, which shows the FRONT panel of the amplifier, you can see 2 black tip
jacks labeled READ BIAS. To measure the current draw of each output tube place the meter
probes into the black tip jacks. (If you read a negative reading reverse the meter probes.)
Set the meter to read 'millivolts' DC (direct current).
2.
Each of the ten (10) output tubes can have its own bias adjusted by adjusting its own
bias adjust pot. On the top view picture on page 6, you can see the numbering sequence for
the 10 output tubes. The corresponding reading for the tip jacks (measurement points) is
selected by the 10 position switch under the tip jacks. Start with the switch in the one o'clock
position. This switch reads like a clock where one o'clock is tube #1 and corresponds to the
left-most adjustment pot. Two o'clock is tube #2 and corresponds to the second from the left
adjustment pot, and so on.
3.
The first step to setting the bias is to turn on the amplifier and ensure that there is
zero signal input, either leave the preamplifier or source signal turned off or unplug the
amplifier input. Also, leave your loudspeakers connected as these provide an ideal load on
the output. (DO NOT EVER OPERATE YOUR AMPLIFIER WITHOUT SPEAKERS
CONNECTED!) It is recommended that you leave the amplifier on long enough to ensure
that the tubes have reached their stable current draw, at least 1/2 hour is recommended.
5.
Place the meter probes in the black tip jacks where they will remain for whole biasing
procedure and switch the select switch to position #1 (one o'clock). Adjust the first bias trim
pot slowly until you measure 275mV to 300 mVDC (0.275V to 0.300VDC). Since you are
measuring across a 10 ohm cathode resistor, this would correspond to a 27 to 30 mA current
draw for each tube by Ohm's law.
6.
If you are unable to bring the bias voltage down to 300 mV on any tube then we
recommend that the tube be carefully watched or replaced.
7.
Follow step five with the remaining tubes, switching to the next tube and adjusting
the next trim pot each time. After you have adjusted all the output tubes, recheck and repeat
the procedure as they will drift a little bit during adjustment. Once they are all set, your
amplifier should be in perfect operation.
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OPERATIONAL NOTES
SWITCHING ON -- SOFT START
The MANLEY 500/200 is equipped with a SOFT-START circuit which lessens the initial stress the amplifier
takes upon turn-on. We recommend that you use this soft start facility whenever you turn the amplifier on
and especially when cold.
1. Ensure that the "mains" switch on the front panel is in the "off" or "0" position
and the OPERATE / STANDBY switch is in the STANDBY mode.
2. Turn on preamplifiers and all source components you plan to use and let them warm up for a
minute.
3. Switch the square mains power switch to the ON position and allow the amplifier a minute or so
to 'warm up'. The blinking LED will indicate that the amplifier is in STANDBY mode.
4. Engage the soft-start swich to the OPERATE position. The blinking standby LED will extin-
guish.
5. Turn up the volume and enjoy.
THE EVER-WARM MODE
After your listening session, if you wish to leave the amplifier in the energy-saving and 'EVER-WARM'
STANDBY mode, engage the OPERATE/STANDBY switch to the STANDBY position. The standby
blinking LED will remind you that the amplifier is in STANDBY mode. The amplifier will draw only 400mA
(30 watts @120VAC) from the mains outlet-- certainly an energy saving way to keep your amplifiers always
ready for a listening session!
TRIODE / TETRODE OPERATION:
With the TRIODE / TETRODE switch, the amplifier may be set for TRIODE or TETRODE
operation. When the switch is in the lower position, the amplifier is in TETRODE mode which will produce
well over 440 watts. When the switch is in the upper position, the amplifier is in TRIODE mode which will
produce half the power of TETRODE operation but as fans of triodes know, nothing can match that sweet
seductive sound of triodes! For some more demanding energetic music, large rooms, or for power hungry
inefficient loadspeakers, you might find you will need the extra power of tetrode operation. Other times and
other situations will find you very well satisfied with the triode mode. One major rule applies for switching
between triode and tetrode:
THE AMPLIFIER MUST BE TURNED OFF OR IN STANDBY MODE BEFORE SWITCHING
BETWEEN TRIODE AND TETRODE!!!!
Follow turn on SOFT START procedure above when re-powering up the unit.
FEEDBACK & SLOPE CONTROLS
The FEEDBACK control varies the global feedback resistor of the amplifier in 2dB steps. This will change
the gain and slew rate of the amplifier. The SLOPE control varies the feedback 'slope' capacitor value which
changes the amplifier's intended roll-off points at supersonic frequencies. The best way to take advantage of
these controls is to let your ears decide which combination works best for your system, speakers, and taste.
Feel free to experiment with different settings to custom-tailor the sound to suit.
TUBE LIFE
You should expect extended life from the tubes in your MANLEY 500/200 if you adhere to the procedures
described above and check your bias at least once every 2-3 months. We stock all the tubes in these
amplifiers should you ever need replacements (and at very reasonable prices too!)
FUSES
The fuses used in your amplifier are standard 1/4" x 1 1/4" SLO-BLO types. The correctly rated fuse has
been installed at the factory for your country's voltage. If replacing a fuse, always unplug the amplifier's
power cord from the wall outlet and always use the exact same type and ampere rating fuse as the one you are
replacing. Failure to do so will void your warranty and can be a dangerous fire hazard. NEVER replace a fuse
with thick wire, tin foil, gum wrappers, or anything else other than the correct fuse!
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SPECIFICATIONS
Vacuum Tubes:
Output Power
10 x 6550(Output), 2 x 6414 (Drivers),
1 x 12AT7 (Input)
TETRODE: 500Watts (@1.5% THD 5 ohm load)
TRIODE: 250 Watts (@1.5% THD 5 ohm load)
Frequency Response, +/- .5 dB
Input Sensitivity
10 Hz - 80 KHz
1V
Input Impedance
100 KOhm
5 Ohm (fixed)
-80 dB
Load Impedance
S/N Ratio @440W
Power Consumption
30 Watts
Quiescent (STANDBY MODE)
1320 Watts Full Power (@1.5% THD 5W load)
Mains Fuse
100, 110, 120V
220, 240 V
10 A (Slo-Blo)
8 A (Slo-Blo)
B+ Fuse
1 1/2A (250V)SLO-BLO
W=19, D=13, H=11 inches
82 lbs EACH
Dimensions
Shipping Weight
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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: MANLEY REFERENCE 500/200 MONOBLOCK
SERIAL No. ______________________________
PURCHASE DATE ______________ SUPPLIER _______________________
NAME OF OWNER _______________________________________________
ADDRESS ______________________________________________________
CITY, STATE, ZIP________________________________________________
TELEPHONE NUMBER ___________________________________________
Comments????________________________________ ___________________
________________________________________________________________
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