MANLEY
LABORATORIES, INC.
OWNER'S MANUAL
STUDIO STANDARD
350 WATT MONOBLOCK
AMPLIFIER
CONTENTS
SECTION PAGE
INTRODUCTION 3
MAINS CONNECTIONS 4
CONNECTING YOUR AMPLIFIER 5
FIGURE 1 FRONT PANEL 6
FIGURE 2 TOP PANEL 7
FIGURE 3 REAR PANEL 8
BIAS PROCEDURES 9
OPERATIONAL NOTES 10
SPECIFICATIONS 11
WARRANTY 12
WARRANTY REGISTRATION 13
NOTES 14
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
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
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 EARTH terminal
BLUE 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.
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 nutdriver (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.
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 meter to read '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
their stable current draw.
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
perfect operation.
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.
OPERATIONAL NOTES
SWITCHING ON
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.
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.
SPECIFICATIONS
Vacuum Tubes: 8 x 6550, 1 x 6350, 1x 12AT7
Output Power
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
Slope Adjustment
20 KHz, (Ref. to 0dB @ 1K) +1 dB slope = MINIMUM
+0.97 dB slope = STANDARD
+0.88 dB slope = MAXIMUM
Input Sensitivity
Full power, feedback MAX 1.8 Vrms
STAND 1.44 Vrms
MIN 1.2 Vrms
Input Impedance 82 Kohm
Load Impedance 5 ohm / 2.5 ohm
S/N Ratio @350W
feedback MIN. -90.69 dB (120Hz)
STAND. -91.90 dB (120Hz)
MAX -93.70 dB (120Hz)
Power Consumption 300 W Quiescent
900 W Full Power
Mains Fuse 100, 110, 120V = 10A (Slo-Blo)
220, 240 V = 5A (Slo-Blo)
B+ Fuse 1.5 A
Dimensions W=19, D=10, H=8.5 inches
Weight 75 lbs
WARRANTY
All Manley Laboratories equipment is covered by a limited warranty against defects in materials
and workmanship for a period of 90 days from date of purchase to the original purchaser only. A
further optional limited 5 year warranty is available to the original purchaser upon proper
registration of ownership within 30 days of date of first purchase.
Proper registration is made by filling out and returning to the factory the warranty card attached to
this general warranty statement, along with a copy of the original sales receipt as proof of the
original date of purchase. Only 1 card is issued with each unit, and the serial number is already
recorded on it.
If the warranty registration card has already been removed then this is not a new unit, and is
therefore not warranted by the factory. If you believe this to be a new unit then please contact the
factory with the details of purchase.
This warranty is provided by the dealer where the unit was purchased, and by Manley Laboratories,
Inc. Under the terms of the warranty defective parts will be repaired or replaced without charge,
excepting the cost of tubes. No warranty is offered on tubes, unless:
1. a Manley Laboratories preamplifier is used with a Manley Laboratories amplifier, and
2. the warranty registration card is filled out.
In such a case a 6 month warranty on tubes is available with the correct recording of the serial
number of the preamplifier on your warranty registration card.
If a Manley Laboratories product fails to meet the above warranty, then the purchaser's sole
remedy shall be to return the product to Manley Laboratories, where the defect will be repaired
without charge for parts and labour. The product will then be returned via prepaid, insured freight,
method and carrier to be determined solely by Manley Laboratories. All returns to the factory must
be in the original packing, (new packing will be supplied for no charge if needed), accompanied by
a written description of the defect, and must be shipped to Manley Laboratories via insured freight
at the customer's own expense. Charges for unauthorized service and transportation costs are not
reimbursable under this warranty, and all warrantees, express or implied, become null and void
where the product has been damaged by misuse, accident, neglect, modification, tampering or
unauthorized alteration by anyone other than Manley Laboratories.
The warrantor assumes no liability for property damage or any other incidental or consequental
damage whatsoever which may result from failure of this product. Any and all warrantees of
merchantability and fitness implied by law are limited to the duration of the expressed warranty.
All warrantees apply only to Manley Laboratories products purchased and used in the USA.
Some states do not allow limitations on how long an implied warranty lasts, so the above
limitations may not apply to you. Some states do not allow the exclusion or limitation of incidental
or consequential damges, so the above exclusion may not apply to you.
This warranty gives you specific legal rights and you may also have other rights which vary from
state to state.
WARRANTY REGISTRATION
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 ___________________
________________________________________________________________
NOTES
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