MANLEY
LABORATORIES, INC.
OWNER'S MANUAL
75 / 150 SE / PP
807 MONOBLOCK
MANLEY LABORATORIES, INC.
13880 MAGNOLIA AVE.
CHINO, CA. 91710
TEL: (909) 627-4256
FAX: (909) 628-2482
email: [email protected]
INTRODUCTION
THANK YOU!...
for choosing the Manley 75 / 150 SE / PP 807 MONOBLOCK Amplifiers. Designed by David Manley, the 807
MONOBLOCK Amplifiers use only the best available components, with the shortest and cleanest signal path
possible. These amps have the exclusive Manley ability to switch from Single ended to Push-Pull topologies. This
amp is designed to provide our customers with a the unique combination of single ended triode topology, solid
power and remarkable specs. This includes flat frequency response, low distortion and optimum damping factor
that are uncommon for single ended designs. In Push-Pull mode there is more of everything - double the power
(150 watts), extended frequency response, and higher damping factor.
Let us start out by stating our opinions about amplifier topologies. Historically, we have been manufacturing very
highly regarded tube amplifiers since before tubes were considered the best option for hi-fi music reproduction.
We have manufactured a very wide range of amplifiers with power ranging from 18 watts to 1000 watts and with
a corresponding variety of tubes. This is not our first amp to feature 807's nor our first single ended triode amp.
We build a $15,000 25 watt single ended amp on a custom basis. In our experience, the more power an amplifier
is capable of - the better it will be at providing acceptable low frequency quality. It is not easy to produce a very
powerful amp with highs with the same quality as the lows. To do that we had to start manufacturing our own
transformers. This is the major development that allowed us to produce an amplifier that could switch from
single-ended to push-pull. We had to design and build a very unusual transformer first.
When several other manufacturers started selling single-ended amps with 5 to 9 watts of power, we understood
subjectively and objectively the good part of the story - the superb mid range - the delicate transient detail - the
inherent simplicity. The bad news was that there were almost no speakers efficient enough to be a dynamic viable
system. The worst news was that either these single-ended amps cost more than the condo and/or they had specs
that could only be a joke. As the triode fans increased, more efficient speakers became available and several
fanatics began to dismiss push-pull as a bad thing to be avoided at all costs. We objected to such blanket
generalities and stressed that the push-pull done right with truly balanced transformers, quality parts throughout
and well designed circuitry has proven to be a superb technique. We also like single ended amps, but only when it
is done right, mostly because we demand flat frequency response and low distortion out of an amplifier.
We set out to design an amplifier that would appeal to us and to you and to the critics. It would be single-ended
but with more power than most single ended amps. It would be switchable to push-pull for fans of that school and
for those who want it both ways - to compare for themselves, and to use each mode depending on the music. This
was the SE / PP 300B amplifiers. We recieved such great response to it that we followed it up with this 8 X 807
based gem that would appeal to people who need reasonable power for their speakers (average sensitivity) and
listening levels (including rock). Up to now, they have had no option of using single ended triodes without trading
in their favorite speakers. We are proud of these amplifiers and have been featuring them at hi-fi trade shows and
exhibitions.
There are other benefits to being an owner of an 807 based amplifier. A prime advantage is that these tubes are
some of the most reliable we have experienced - plus these tubes are readily available and not extremely costly.
These amplifiers have a highly polished look thanks to the gold and chrome finishes. These new metal
technologies were not available a few years ago. Built to last a lifetime. Designed to look elegant. Engineered by
David Manley who happens to love music enough to be his lifes career.
READ THIS PAGE BEFORE YOU SET UP THE AMPS, PLEASE
IMPORTANT Never operate this amp without a speaker or load connected. Never drive this amp into a short
circuit. Most solid state amps can be operated without a load or speaker and some can drive a short circuit because of
protection circuitry. These are different - Like most tube amps the output power is less affected by changing the load
impedance within the range of 4 to 16 ohms, however extremes like a short or open circuit are to be avoided. The result
could be damage to transformers, tubes. The warranty does not cover this damage if it occurs.
LOCATION & VENTILATION
IMPORTANT - PLEASE PROVIDE A SAFE LOCATION, SUCH AS A LOCKED
CABINET, IF THERE ARE CHILDREN OR PETS IN THE HOME.
At the top of the 807 tubes is a ceramic connector. This connector typically carries 630 VOLTS DC when the amplifier
is on and afterwards until the power supply discharges. With all the tubes in this is typically 30 seconds.
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.While these end caps provide sufficient insulation while attached to
the tube - there is a shock hazard if they are removed and children can remove them. Manley Labs can supply an optional
"Cover" for these amps if needed.
Besides the high voltage, there is another hazard - HEAT. A child, spouse or pet could get a mild burn by touching a hot
tube. Tubes produce heat but not as much as a light bulb. Most people do not put exposed light bulbs on the floor but
many audiophiles do put tube amplifiers on the floor. Beware that it may be possible to step on an amplifier in the dark
or trip on a cable and fall on one. Shades of "Help! I've fallen and can't get up!". The other thing to be aware of is poor
ventilation if the amp is on a carpet. There is ventilation holes in the bottom of the chassis that are essential for the long
and healthy life of the amp. Ventilation is also important if they are put in a cabinet with a door. 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.
Isolation from vibration is worth considering because this will help to reduce tube microphonic noise and very likely
allow the maximum sonic potential that these amps are capable of. Lastly, be aware that some equipment can radiate a
strong electromagnetic field. Hum and noise problems are often cured by avoiding stacking electroic gear on top of each
other. Distance helps greatly.
GENERAL NOTES
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
Before turning the amps on - Connect your preamp to the amp inputs. Tubes may become loose during transit.
Straighten and press down each tube before plugging the amplifier into the mains socket. Once connections are secure
turn the preamp on, wait a minute, turn the power amps on last. Always turn the amplifiers off first, then other gear. This
prevents damage to equipment - particularily speakers. 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.
WARNING!
TO PREVENT THE RISK OF ELECTRIC SHOCK DO NOT OPEN THE CABINET.
REFER SERVICING TO QUALIFIED PERSONEL.
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
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 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
CONNECTIONS HAVE BEEN MADE.
CONNECTING YOUR AMPLIFIER
Setting up your amplifiers is rather easy.
1. Connect all source components (turntable, CD, Tuner, Tape DAT, etc.) to
your preamplifier or switching center.
2. Connect the interconnects from the output of the preamplifier to the RCA input
on the top rear of the amplifiers.
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
break the connections inside the amplifier.
4. Ensure that the "mains" switch on the front panel is in the "off" or "0" position. If
the 807s are not inserted - do it now - .
5. Turn on Preamplifier and any source components you plan to use.
6. Plug Amplifiers into wall outlets.
7. Set both amps up at the same SE or PP settings. SE is a good place to start.
8. Switch the square mains power switch to the ON or "1" position and allow the
amplifier a minute or so to 'warm up'. The glowing panel and glowing tubes will
indicate that the amplifier is on.
9. Turn up the volume on the preamp and enjoy. If something is "humming" don't
panic. All you need to do is use a "3 pin to 2 pin AC adapter" or "cheater". The
problem is too many grounds - you should only have one. Check out the next
section for help with hum.
10. Now, while music is playing, try switching to PUSH / PULL. The difference
may or may not be subtle. Choose the mode you like best with this music. There
may be a distressing "click" as you switch - this is normal.
GROUNDING and POWER:
In the event of HUM we suggest that you alter the ground scheme. Electronic gear
often has 3 pin grounds for safety reasons and international regulations. Unfortu-
nately audio equipment is also prone to sensitivity to ground loops. The usual
cure is to use 3 pin to 2 pin AC adapters availble at most hardware stores for
about a dollar. Do not break off the AC ground pin.
With the power off, try an adapter on ONE of the amps. If you have other units such
as preamps or CD players with 3 pin AC plugs, use adapters here as well. The
goal is to have ONLY ONE piece of equipment connected to AC ground via AC
plugs. Other gear is grounded via the RCA interconnects. Only after all connec-
tions have been made should you turn on the power with the amplifiers being last
on and first off always.
A different alternative is to ground the preamp and to use adapters on every other
piece of gear with 3 pin AC plugs. Alas, few preamps have AC ground pins.
A third alternative is to use "balanced AC" (60-0-60) transformers to power all the
equipment. The latest revision of the USA electrical codes allows this as a "legal"
technique. It works very well at reducing many types of noise 10 to 15 dB.
MANLEY 75 / 150 SE / PP 807 TRIODE MONOBLOCK
B
E
C D
A
F
G
M
1 2 3 4
5 6 7 8
H
5
H
2
H
7
H
4
J
H
6
H
1
H
8
H
3
I
1
2
3
4
N
5
6
7
8
K
Amplifier Overhead View
L
A
B
C
D
E
F
G
H
I
RCA Input Jack
Speaker Terminals
B PLUS FUSE - Replace only with same type and value (MDL 1.5)
Mains fuse - Replace only with same type and value
IEC Mains socket
Output Transformer
Power Transformer
Power Tube 807 s
Input Tube 5751
J
Driver Tube 7044
K
L
M
N
Single-Ended / Push- Pull Switch
Power Switch
Bias Adjustment Trimmers (each 807 has a trim and test point numbered)
Bias Test Points (Black test point is Ground)
REPLACING FUSES & LAMPS
The fuses are accessable without removing any panels. Be sure the IEC AC power cable is
removed before checking the Mains Fuse. Often a bad fuse will look blackened internally but
occasionally will look OK. Replace only with the same type and rating ! For 100 or 120 volt countries
the fuse should be a 10 AMP SLO-BLO. For 220 or 240 volt countries it should be 5 AMP SLO-BLO.
If a new fuse blows then it is likely there is another problem. Remove the 807s and try again. If the
indicator lights, then a tube is bad. At least one of them is the problem.If the fuse blew again - The
amplifier needs to be repaired by a competent technician or the factory.
Before removing the B+ Fuse let the power supply fully discharge - this will take at least 1
minute. The cap is removed with a proper sized screwdriver and 1/4 turn anti-clockwise while gently
pressing down.The B+ Fuse we use is ceramic and not able to be visually checked - a VOM meter is
needed. The symtom will be - lit indicators and glowing tubes but no sound.
The indicator is a fuse style lamp 1.25" X .25", 8 volt, 0.3 amp. The bottom must be removed
to access the lamp. Again, wait until the supply discharges.
BIAS ADJUSTMENT TRIMMERS
See the next page for full details - Read the voltage between the black test point and
each of the numbered red points. If the reading is not 0.340 volts or 340 mV then adjust the
corresponding numbered trimmer.
OPERATIONAL NOTES
SWITCHING SINGLE-ENDED 75 / PUSH-PULL 150 This amplifier has a feature exclusive to
Manley Labs of being able to choose between two circuit topologies. You are able to switch
between each mode while the amplifier is turned on and playing music. In SINGLE-ENDED mode
the amplifier uses eight 807s in parallel. The advantage is a minimalist circuit requiring no "phase
splitter",The disadvantage is a less efficient circuit that produces half the power of PUSH-PULL. In
PUSH-PULL mode each tube works in opposite phase to the other and relies on the output
transformer to make the polarities work together. This has advantages in efficiency and in the
distortion and noise cancellation properties of a balanced circuit. Both ways are operated in "Class
A" bias throughout and both are PURE TRIODE and both modes have a similar short signal path.
ADJUSTING BIAS
The amplifier has been factory adjusted and should not need adjustment more than once a month.
This does more for tube life than it does for sound quality. You will need a DC voltmeter and a
small flat screwdriver. This should be checked every few months but does not need to be
necessarily adjusted unless an 807 pwer tube is replaced. Checking verifies that each tube is stable
and operating properly. It may be the first hint that a tube is needing replacement.
1) Let the amp warm up in SINGLE-ENDED mode for about an hour, then with no music
playing.... Set the volt meter to a low DC range such as 1 or 2 volts DC.
2) Put negative or black probe of the voltmeter to the black test point (ground),front and center of
the amplifier and the red or positive probe in the small red socket most left front near the 807s. See
the diagram on the previous page that indicates which test point and trimmer relates to which tube.
3) The meter should read 340 mV or 0.34 volts DC. If not -then you can adjust the trimmer
without opening the chassis. It is located in the hole near the transformer and is blue. Adjust it
gently and fairly slowly. A little "drift" is normal.
4) Now check and/or adjust the other tube's bias. Use the next right red probe socket and the next
right trimmer and adjust the same way. Continue for all 8 power tubes.
5) You may want to re-check each tube's test point and re-adjust if needed. There may be some
small interaction - particularly if a tube was replaced.
TUBE LIFE
You should expect many years of life from the tubes in your MANLEY SE / PP 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. For 120 volts the correct fuses are MDL10 for the mains. For 240
volts the correct fuses are MDL5 for the mains.
INDICATOR LAMP
The lamp is a 1/4" X 1 1/4" fuse style rated at 8 volts and 0.3 amps. Power should be disconnected,
the power supply discharged (1 minute). The bottom panel will have to be removed, The lamp is
clearly accessable directly behind the semi-translucent Manley logo panel. Gently pry out one end
to remove the lamp for replacement.
SPECIFICATIONS
Vacuum Tubes:
8 x 807 (Output), 1 x 7044 (Driver),
1 x 5751 (Input)
Output Power @ 3% THD
SINGLE-ENDED: - 72 Watts
PUSH-PULL: - 150 Watts
Frequency Response +/- 1 dB
(measured at 5 watts)
SINGLE-ENDED: 18 Hz - 20 KHz
PUSH-PULL: 10 Hz - 50 KHz
1 V nominal
Input Sensitivity
Input Impedance
Load Impedance
40 KOhm
4 to 12 Ohm appropriate for 4 & 8 ohm speakers
12 to 20 Ohm appropriate for 16 ohm speakers
S/N ratio @ 33 watts
Power Consumption
Mains Fuse
Typically 86 dB or a -76 db noise floor 10Hz-30K
250 Watts
100, 110, 120V
220, 240 V
10 A (Slo-Blo)
5 A (Slo-Blo)
Lamp
1/4 X 1 1/4 Fuse lamp - 8 volt, 0.3 amp
W=19", D=13", H=8" inches
75 lbs EACH
Dimensions
Shipping Weight
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 ____________________ SERIAL No. ______________________
PURCHASE DATE ______________ SUPPLIER ______________________
---------------------------------------------------------------------------------------------------
PLEASE DETACH THIS PORTION AND SEND IT TO MANLEY LABORATORIES
MODEL: MANLEY SE / PP 300B MONOBLOCK
SERIAL No. ______________________________
PURCHASE DATE ______________ SUPPLIER _______________________
NAME OF OWNER _______________________________________________
ADDRESS ______________________________________________________
CITY, STATE, ZIP________________________________________________
TELEPHONE NUMBER ___________________________________________
Comments???? ___________________________________________________
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