OWNER'S MANUAL LANGEVIN ALL-DISCRETE PULTEC EQP1-A TYPE EQUALIZER MANLEY LABORATORIES, INC. MANUFACTURED BY MANLEY LABORATORIES, INC. 13880 MAGNOLIA AVE. CHINO, CA. 91710 TEL: (909) 627-4256 FAX: (909)628-2482 email: emanley@netcom.com http://www.manleylabs.
CONTENTS SECTION PAGE INTRODUCTION 3 MAINS CONNECTIONS 4 OPERATION 5 CONNECTIONS 6 FRONT PANEL 7 REAR PANEL 8 SERVICE 9 SPECIFICATIONS 10 WARRANTY 11 WARRANTY REGISTRATION 12 APPENDIX "1" WIRING YOUR OWN CABLES
INTRODUCTION THANK YOU!... for choosing the Langevin All-discrete Pultec Type Equalizer. The Langevin Pultec Equalizer utilizes the original WESTERN ELECTRIC passive-equalization circuit found in the long-out-of-production and justifiably famous PULTECS. It is also the exact EQ section found in our MANLEY Enhanced Pultec EQ, the difference being that the Manley unit uses and all-tube make up gain amplifier while the Langevin employs an all discrete make up gain amplifying circuit.
MAINS CONNECTIONS Your Pultec 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.
OPERATION The Langevin EQP1-A is another variation of the Pultec EQP1-A. Manley Labs is the only company today with permission from Eugene Shenk (founder of Pulse Technologies) to use the original Western Electric passive EQ circuitry that Pultec licensed and were given Eugene's personal blessing in the endeavor. We have improved on the circuit by increasing the number of frequencies and by using an all discrete solid state 10 dB make-up gain amplifier / line driver.
CONNECTIONS The Langevin products are very easy to connect in most studio situations. There are both XLR balanced inputs and outputs as well as 1/4 inch jacks for unbalanced inputs and outputs. Please read this section because there is some special considerations and notes. The XLR Inputs and Outputs are transformerless.
FRONT PANEL IN BOOST SELECT CUT BANDWIDTH D E SELECT BOOST SELECT CUT POWER BYPASS A B C LOW FREQUENCY SECTION F G HIGH FREQUENCY BOOST SECTION H I J K HIGH FREQ. CUT SECTION A IN / BYPASS - This switch in BYPASS mode bypasses the EQ section while the amplifier remains in circuit. B L.F. BOOST - Provides continuously variable BOOST from 0dB to +12dB to the low frequency selected by control C.
REAR PANEL A B C D E F G H A IEC MAINS SOCKET - Accepts standard 50/60 Hz AC mains voltage. The third pin earth is tied to chassis in this unit. Inside the unit (if the top is removed) is a switch next to the power transformer for selecting mains voltage for either 110 or 220 VAC. This is factory set for your country but if you do a lot of international recording it is nice to know this unit can go with you. B FUSE HOLDER - To remove the fuse, push and turn the fuse holder cap.
SERVICE NOTES GAIN The gain of the makeup amplifier is factory preset for unity gain from input to output in bypass mode (which is also the same as all boost & cut controls set at minimum positions, fully counter-clockwise). If for some reason your EQ needs to be re-trimmed for unity gain or you need other than unity gain the trimmer is labelled VR1 and it adjusts the basic gain of the output line amplifiers.
SPECIFICATIONS Circuit All discrete transistor used only for gain EQ is passive - no transistors in EQ Transformerless Regulated low noise supply Frequency response ±0.5 dB 10Hz to 60KHz THD >.04% Noise (w/ 80KHz filter) 0.25 mV (-70dB) S/N ratio (Ref.
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.
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 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.
