Manley Labs 500/200 WATT MONOBLOCK AMPLIFIER User's Manual
Contents
1. The MANLEX 500 200 is equipped with a SOFT START circuit which lessens the initial stress the amplifier takes upon turn on We recommend that vou use this soft start facilitv whenever vou 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 120V AC 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 4402. 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 Please note The correct input selection MUST be made 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 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 Turn on Preamplifier and any source components you plan to use Plug amplifier into wall outlet 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 Engage the soft start swich to the OPERATE position The blinking standby LED will extinguish 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 w
3. 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 amp 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
4. 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 emanley netcom com CONTENTS SECTION INTRODUCTION MAINS CONNECTIONS CONNECTING XOUR AMPLIFIER DIAGRAM VIEW DIAGRAM REAR VIEW DIAGRAM FRONT VIEW BIAS PROCEDURES OPERATIONAL NOTES SPECIFICATIONS WARRANTY WARRANTY REGISTRATION INTRODUCTION THANK YOU for choosing the Manlev 500 200 Monoblock Amplifiers Designed bv David Manlev the Manlev 500 200 Monoblock Amplifiers use onlv 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 vou 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 performan
5. WITCH LED SWITCH BLINKING READ BIAS FEEDBACK SLOPE MINIMUM STANDARD GY MAXIMUM 2244101010100 2 3 4 5 6 7 8 9 FRONT VIEW OF AMPLIFIER WITH BIAS COVER PLATE REMOVED SHOWING BIAS ADJUST POTS BIAS PROCEDURES The Manlev 500 200 Monoblock Amplifiers uses a fixed bias svstem that requires verv little attention We recommend checking the bias everv 2 3 months or anv time vou replace an output tube To adjust or check the bias follow the following steps For this procedure vou 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 vou 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 vou read a negative reading reverse the meter probes Set the meter to read millivolts DC direct current gt 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 corres
6. 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 SPECIFICATIONS Vacuum Tubes Output Power Frequency Response 5 dB Input Sensitivity Input Impedance Load Impedance S N Ratio 440W Power Consumption Mains Fuse B Fuse Dimensions Shipping Weight 10 x 6550 Output 2 x 6414 Drivers 1 x 12AT7 Input TETRODE 500Watts 01 5 THD 5 ohm load TRIODE 250 Watts 01 5 THD 5 ohm load 10 Hz 80 KHz IV 100 KOhm 5 Ohm fixed 80 dB 30 Watts 1320 Watts Quiescent STANDBY MODE Full Power 01 5 THD 502 load 100 110 120V 220 240 V 10A Slo Blo 8 A Slo Blo 1 1 2A 250V SLO BLO W 19 D 13 H 11 inches 82 Ibs EACH WARRANTY AlI Manley Laboratories equipment is covered by a limited warrantv against defects in materials and workmanship fora period of 90 days from date of purchase to the original purchaser only A further optional limited 5 y
7. ce 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 amp 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 MAINS CONNECTIONS GENERAL NOTES LOCATION amp VENTILATION The Manlev 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 di
8. ct will then be returned via prepaid insured freight method and carrier to be determined solely by Manley Laboratories All returns to the factory must bein the original packing new packing will be supplied for no charge if needed accompanied by a written description ofthe defect and must be shipped to Manley Laboratories via insured freight atthe customer s ownexpense 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 unauthorizedalteration by anyone otherthan 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 inthe 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 orconsequential damges so the above exclusion may notapply to you This warranty gives you specific legal rights and you may also have otherrights which vary from state to state WARRANTY REGISTRATION We ask t
9. d 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 WARNING TO PREVENT THE RISK OF ELECTRIC SHOCK DO NOT OPEN THE CABINET REFER SERVICING TO QUALIFIED PERSONEL CONNECTING XOUR AMPLIFIER Setting up vour amplifiers is rather easv 1 2 9 Connect all source components turntable CD Tuner Tape DAT etc to your preamplifier 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 If using a BALANCED output from your preamplifier connect the 3 pin XLR interconnects
10. ear 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 onit If the warranty registration card has already been removed then this is not anew 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 aManley Laboratories preamplifier is used with a Manley Laboratories amplifier and 2 the warranty registration card is filled out In such acase a 6 month warranty on tubes is available with the correct recording of the serial number of the preamplifier on your warranty registrationcard Ifa 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 produ
11. hat vou please fill out this registration form and send the bottom half to MANLEV LABORATORIES REGISTRATION DEPARTMENT 13880 MAGNOLIA AVE CHINO CA 91710 Registration entitles vou to product support full warrantv 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 Manlev 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
12. ill remind you that the amplifier is in STANDBY mode TOP VIEW 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 tvpe and we stronglv 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 warrantv DRIVER TUBES 2 x 6414 The 6414 is an American military uprated version of the I2BH7A with increased current drive INPUT TUBE 12AT7WA The 12AT7WA has several equivalent numbers 12AT7 12AT7A 6201 ECCSI etc Any of these types may be used We have selected this IZAT7WA very carefully for noise microphonics and constancy Replacement tubes of premium quality are always available from MANLEY LABORATORIES REAR VIEW UNBALANCED BALANCED MAINS IN MAINS B FUSE RCA XLR SPEAKER IEC FUSE SLO BLO UNBALANCED BALANCED OUTPUT SLO BLO INPUT INPUT BINDING UNBALANCED POSTS BALANCED SELECT FRONT VIEW FEEDBACK SLOPE MINIMUM STANDARD 7 MAXIMUM e MANLEY or DESIGNERS REFERENCE SERIES 500 200 WATT MONOBLOCK DES GNED BY DAVID MANLEY TETRODE Handcrafted in Chino California STANDBV U TO SET BIAS REMOVE THIS COVER PLATE y POWER TRIODE OPERATE MAINS LED TETRODE STANDBY POWER SWITCH EVER WARM ON OFF STANDBY SOFT START S
13. ponds 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 3 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 1 Follow step five with the remaining tubes switching to the next tube and adjusting the next trim pot each time After vou have adjusted all the output tubes recheck and repeat the procedure as thev will drift a little bit during adjustment Once thev are all set vour amplifier should be in perfect operation OPERATIONAL NOTES SWITCHING ON SOFT START
14. rectly 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 amp 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 shoul
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