MANLEY LABORATORIES, INC. OWNER'S MANUAL MANLEY NEO-CLASSIC 250 / 100 WATT MONOBLOCK AMPLIFIER MANLEY LABORATORIES, INC. 13880 MAGNOLIA AVE. CHINO, CA. 91710 TEL: (909) 627-4256 FAX: (909) 628-2482 REV.
CONTENTS SECTION PAGE INTRODUCTION 3 MAINS CONNECTIONS 4 CONNECTING YOUR AMPLIFIER 5 TOP, REAR, FRONT VIEW OPERATIONAL NOTES 6,7,8 9 BIAS PROCEDURE 10 REPLACING TUBES 11 TROUBLESHOOTING 12 SPECIFICATIONS 13 WARRANTY 14 WARRANTY REGISTRATION 15
INTRODUCTION THANK YOU!... for choosing the Manley Neo-Classsic 250/100 Monoblock Amplifiers. The Manley 250/100 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.
MAINSCONNECTIONS 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.
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. Connect the interconnects from the output of the preamplifier or switching center to the RCA input on the top rear of the amplifiers. IF your source has a truly BALANCED output, connect TO the XLR input and select the balanced input. This switch is a locking type to prevent inadvertant or accidental switching (say, while cleaning).
OVERHEAD VIEW INPUT INPUT BAL/UNBAL. B+, & MAINS IEC MAINS IN FUSES XLR RCA SWITCH OUTPUT 3 1 2 4 12BH7 12BH7 10 8 6 5 7 9 12AT7 Tube Location & Type OUTPUT TUBES:10 x EL34 The EL34 types we recommend are the Sovtek EL34G, EL34G+, EL34WXT, or the Electro-Harmonix EL34EH . These have been proven to be the most rugged, reliable, and best sounding for these amplifers and we strongly emphasize that only these types should be used in this amplifier.
REAR VIEW ce N9512422 MAINS IN IEC MAINS B+ FUSE FUSE SLO-BLO SLO-BLO BALANCED UNBALANCED SWITCH 7 RCA XLR INPUT BALANCED INPUT SPEAKER OUTPUT BINDING POSTS
FRONT VIEW MANLEY 250 TRIODE MUTE TETRODE 1 2 3 4 5 6 7 8 9 10 GROUND FRONT VIEW OF AMPLIFIER WITH INSERT REMOVED OPERATE STANDBY EVER-WARM SOFT START SWITCH SHOWING BIAS MEASUREMENT POINTS AND BIAS ADJUST POINTS 8 MAINS POWER ON / OFF SWITCH
OPERATIONAL NOTES SWITCHING ON -- SOFT START The MANLEY NEO-CLASSIC 250/100 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.
BIAS PROCEDURE The Manley 250/100 Monoblock Amplifier uses a fixed bias system that requires very little attention. The term "bias" as used here refers to an externally adjustable voltage applied to each of the output tubes. This voltage setting optimizes the operation of the tubes; proper adjustment ensures the best sonic performance and longest tube life. We recommend that this adjustment be performed upon initial receipt of the amps, and every 2-3 months thereafter.
REPLACING TUBES (Also refer to page 6) How long will these tubes last? We can't say for sure. Some die prematurely and some tubes last more than 30 years. The average for the tubes in the 250 seems to be 4 to 5 years depending on useage. As with all tubes, their quality degrades with age. This is due to decreasing cathode emission, a natural process found in all tubes.
TROUBLESHOOTING It is rare that any of these problems occur but if they do here is some things to try. HUM - Try a mains ground adapter if they are legal in your country. They are also called 3 pin to 2 pin adapters or "cheaters" and are available in hardware stores. There should be one ground in your system and only one. If two or more pieces of gear have 3 pin AC cables a ground loop can occur which will usually cause hum.
SPECIFICATIONS Vacuum Tubes: Output Power 10 x EL34 (Output), 2 x 12BH7A (Driver), 1 x 12AT7 (Input) TETRODE: 250 Watts (@1.5% THD 5 ohm load) TRIODE: 100 Watts (@1.5% THD 5 ohm load) Frequency Response, +/- .5 dB 10 Hz - 80 KHz Input Sensitivity 1V Input Impedance 100 KOhm Load Impedance 5 Ohm (fixed) S/N Ratio @250W -80 dB Power Consumption 30 Watts Quiescent (STANDBY MODE) 815 Watts Full Power (@1.
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.
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.
