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Table of Contents
MANLEY
LABORATORIES, INC.
Neo-Classic
250 & 500 WATT
AMPLIFIERS
OWNER'S MANUAL
TUBES
brought to you by the clever folks at:
MANLEY LABORATORIES, INC.
13880 MAGNOLIA AVE.
CHINO, CA. 91710 USA
TEL: (909) 627-4256
FAX: (909) 628-2482
email: emanley@manleylabs.com
website: www.manleylabs.com
RULE
Revision 9-28-2007 by CD
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Summary of Contents for Manley AMPLIFIERS
- Page 1 MANLEY LABORATORIES, INC. Neo-Classic 250 & 500 WATT AMPLIFIERS OWNER'S MANUAL TUBES brought to you by the clever folks at: MANLEY LABORATORIES, INC. 13880 MAGNOLIA AVE. CHINO, CA. 91710 USA TEL: (909) 627-4256 FAX: (909) 628-2482 email: emanley@manleylabs.com website: www.manleylabs.com...
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Page 2: Table Of Contents
SECTION INTRODUCTION MAINS CONNECTIONS CONNECTING YOUR AMPLIFIER TOP VIEW & TUBE LOCATION FRONT & REAR VIEW OPERATIONAL NOTES BIAS PROCEDURE REPLACING TUBES TROUBLESHOOTING SPECIFICATIONS WARRANTY WARRANTY REGISTRATION PACKAGING CONTENTS PAGE 12,13... -
Page 3: Introduction
We run high voltages on the plates of the output tubes but operate them at lower current which will result in their longer life. Although each output tube has its own bias-adjust, we carefully fit each amplifier with computer-batched tubes for best performance. -
Page 4: Mains Connections
(Using a Fast Blow fuse when we have specified a SLO-BLO fuse is one reason...) If you have no idea why a fuse might have just blown on its own, you might want to consult with Manley Labs or your dealer for further advice as to what Very Bad Thing might have occured, like the power transformer might have decided to retire early or protest its oppressive conditions. -
Page 5: Connecting Your Amplifier
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 on the switch. If using a standard UNBALANCED source, select and use the unbalanced RCA connector. -
Page 6: Top View & Tube Location
The MANLEY NEO-CLASSIC 250 & 500W MONOBLOCKS have been thoroughly optimised around these tubes. Use of unapproved tube types can and will void your warranty. -
Page 7: Front & Rear View
FRONT VIEW TRIODE MUTE TETRODE 1 2 3 4 5 FRONT VIEW OF AMPLIFIER WITH INSERT REMOVED SHOWING BIAS MEASUREMENT POINTS AND BIAS ADJUST POINTS REAR VIEW N9512422 MAINS IN B+ FUSE MAINS SLO-BLO FUSE SLO-BLO MANLEY 6 7 8 9 10 GROUND BALANCED/ INPUT... -
Page 8: Operational Notes
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 warmed up and always ready to listen to! TRIODE / TETRODE OPERATION: With the TRIODE / TETRODE switch, the amplifier may be set for TRIODE or TETRODE operation. -
Page 9: Bias Procedure
BIAS PROCEDURE The Manley 250 & 500 watt Amplifiers use 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 grids. This voltage sets the correct current draw for each output tube. Proper adjustment ensures the best sonic performance and longest tube life. -
Page 10: Replacing Tubes
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's & 500's seems to be 4 to 5 years depending on usage. As with all tubes, their quality degrades with age. -
Page 11: Troubleshooting
HISS - Throw the MUTE switch and listen. Did the hiss stop? If so, then the source of the hiss is UPSTREAM from the amplifiers, being generated by your preamps or source components. Some amount of hiss is to be expected from any gear that is amplifying. If the noise level stayed the same when you engaged the MUTE switch, and it is too hissy for you, then try replacing the 12AT7 input tube with a quieter one. -
Page 12: Specifications
SOFT-START turn on mode: minimizes in-rush current by first powering up amplifier to half voltages EVER-WARM mode: for standby keeps tubes warmed up at half voltages MANLEY Precision Output Transformer: designed and wound at Manley Labs Front panel bias measurement and adjust: Concealed under the black oval insert Output Tube Standing Current: 27.5mA... - Page 13 SPECIFICATIONS (500W) ALL-TUBE monoblock design 10 x KT90 or 6550C output tubes High current double 6414W driver stage 12AT7EH large plate Electro-Harmonix Russian input tube BALANCED & UNBALANCED inputs MUTE switch TRIODE / TETRODE switching S0FT-START/ EVER-WARM standby mode MANLEY Precision output transformer Factory set for 5 ohms nominal Front panel bias measurement and adjust (hiding under the black insert) Large filter / reservoir capacitors 3800uF x 2...
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Page 14: Warranty
Factory original packaging can be ordered from Manley Labs. Customer will be charged for new factory original packaging if customer fails to ship product to Manley Labs in the original factory packaging. After repair, the product will then be returned to customer via prepaid, insured freight, method and carrier to be determined solely by Manley Laboratories. -
Page 15: Warranty Registration
WARRANTY REGISTRATION We ask, grovel and beg that you please fill out this registration form and send the bottom half to: Or you may FAX this form in to: +1 (909) 628-2482 or you may fill in the online warranty registration form found in the Tech Support section of our website www.manleylabs.com or you can be really diligent and register your warranty three times to see if we get confused! Registration entitles you to product support, full warranty benefits, and notice of product... -
Page 16: Packaging
Amplifier Pre-packing Instructions: Step 1: Remove the perforated top cover. Use a #2 Phillips screwdriver to remove nine philips 6-32 screws: Three per side, two on the top, and one in the back of the cage, in front of the two big B+ capacitors.