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Summary of Contents for Manley Langevin ELOP
- Page 1 OWNER'S MANUAL LANGEVIN ELECTRO-OPTICAL LIMITER MANLEY LABORATORIES, INC. MANLEY LABORATORIES, INC. 13880 MAGNOLIA AVE. CHINO, CA. 91710 TEL: (909) 627-4256 FAX: (909) 628-2482 email: emanley @ netcom.com http://www.manleylabs.com...
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Page 2: Table Of Contents
CONTENTS SECTION PAGE INTRODUCTION MAINS CONNECTIONS OPERATION NOTES 5 & 6 FRONT PANEL REAR PANEL TROUBLE SHOOTING 9 & 10 INTERNAL ADJUSTMENTS SPECIFICATIONS WARRANTY WARRANTY REGISTRATION... -
Page 3: Introduction
BALANCE control to "fine tune" the stereo image in LINK mode. Around Manley Labs we call the unit "The Langevin ELOP". Please take a few moments to read through this manual carefully as it contains information essential to proper operation of this unit. -
Page 4: Mains Connections
Note: This unit has been factory wired for your country. If you plan to take the unit to countries with a different mains voltage you will need to send the Limiter to Manley Labs for the correct power transformer - or use AC voltage converters. -
Page 5: Operation Notes 5
OPERATION NOTES The Langevin Electo-Optical Limiter follows certain traits and traditions established by the UREI LA-3A and similar levelling amplifiers. These traits can be divided into two aspects - electronic and operation. The electronic concept is simple and rather clean. Use the audio to light up LEDs which shine onto photo-resistors. - Page 6 There is not many options for adjustment and fine tuning. The good news is that at least the Manley is clean enough to pass a good mix.
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Page 7: Front Panel
FRONT PANEL NOTE: Right channel is a mirror image of the Left We do this to preserve exact similarity of the audio electronics (path length, PCB layout, etc) IN / BYPASS. Audio still flows through the tubes in BYPASS but at Unity Gain. Switching to IN provides the Limiting controls and functions. -
Page 8: Rear Panel
REAR PANEL 1/4" INPUT (BALANCED) (RIGHT) TIP: HOT SLEEVE: GROUND Any of the "balanced inputs can be used with unbalanced sources XLR INPUT (BALANCED) (RIGHT) PIN 1: GROUND PIN 2: HOT (+) PIN 3: GROUND 1/4" OUTPUT (UNBALANCED) (RIGHT) TIP: HOT SLEEVE: GROUND Use only 1/4"... -
Page 9: Trouble Shooting 9
Manley uses the professional standard of +4 dBm = Zero VU = 1.23 volts AC RMS. A lot of semi-pro gear uses the hi-fi reference of -10 dBm = Zero VU. This is a 14 dB difference that will certainly look goofy and may tend to distort. Often there are switches on the semi-pro gear to choose the pro reference level. - Page 10 HUM - Let's assume it knows the words. Once again - several possibilities - several cures. Most likely it is a ground loop. The two most common procedures are: try a 3 pin to 2 pin AC adapter (about a dollar at the hardware store) which is better than messing up the power cable by bending the ground pin until it breaks off.
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Page 11: Internal Adjustments
INTERNAL ADJUSTMENTS +36 Volt DC adjust with meter from ground to resistor marked by arrow. Check this first and adjust if needed. It is the power supply regulator adjustment. Now for the audio ..You will have to start out by setting front panel controls to these settings. BYPASS mode, SEP ( LINK OFF ), REDUCTION controls counter clockwise (MIN), GAIN to 1:00 or unity, Balance at 12:00. -
Page 12: Specifications
SPECIFICATIONS Langevin Electro- Optical Limiter Maximum Input (Bypass through Line Amplifier) +30 dBv (with Limit "IN" the maximum is entirely variable) Maximum Output +30 dBv Headroom (referenced to +4 dBv) 26 dB Frequency Response: 10 Hz to 70 kHz +/- 0.5 dB THD &... -
Page 13: Warranty
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. -
Page 14: Warranty Registration
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 to use Manley Laboratories. MODEL ____________________ SERIAL No.
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