MANLEY LABORATORIES, INC. OWNER'S MANUAL ENHANCED PULTEC EQP1-A EQUALIZER MANLEY LABORATORIES, INC. 13880 MAGNOLIA AVE. CHINO, CA. 91710 USA TEL: (909) 627-4256 FAX: (909) 628-2482 email: emanley@netcom.com http://www.manleylabs.
CONTENTS SECTION PAGE INTRODUCTION 3 EQ HINTS 4 FRONT PANEL 5 REAR PANEL 6 MAINS CONNECTIONS 7 TECH NOTES 8 TROUBLESHOOTING 9, 10 CURVES 11, 12 WARRANTY 13 WARRANTY REGISTRATION 14 APPENDIX: WIRING YOUR OWN CABLES ? TEMPLATE FOR STORING SETTINGS
INTRODUCTION THANK YOU!... for purchasing the Manley Laboratories Enhanced Pultec EQP-1A Equalizer. The Enhanced Pultec Equalizer utilizes the original WESTERN ELECTRIC passive-equalization circuit found in the long-out-of-production and justifiably famous PULTECS. According to experts, Western Electric developed the passive EQ in the 30's to allow music to pass through a typical telephone system.
EQ HINTS We usually give a few hints about tricks commonly used with our products. With an EQ of this type it is not so likely you need much help. The most common question we get asked about our Pultecs is "Why both a boost and a cut knob in the lows?". We don't know why it was designed that way for sure. It was designed in the 1930's by Western Electric to improve music fed through telephone lines. We believe it was done this way because it was the most practical in a simple passive design.
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 - Shelf - Provides continuously variable BOOST from 0dB to +15dB to the selected low frequency (control C). Check out the curves on pages 15 & 16.
REAR PANEL DIRECT IN CIRCUIT BALANCED UNBALANCED OUTPUT GROUND 180º CHASSIS A B C 0º D E F G H I A IEC MAINS SOCKET - Accepts standard 50/60 Hz AC mains voltage. Check that the voltage indicated on the back is the same as the mains in your country. B FUSE HOLDER - To remove the fuse, push and turn the fuse holder cap. Use a 1 Amp SLO-BLO fuse. Always replace fuse with same value and type. C GROUND TERMINALS - Use these to minimise hum. See troubleshooting section.
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.
TECH NOTES SWITCHING ON The power switch is located on the right hand corner of the front panel. When one first turns on the power the LED next to the switch is red, indicating "mute"- after about twenty seconds it turns green and audio can pass. This prevents thumps or pops during warm-up and shut-down. The circuit is smart enough to ignore short black-outs. The audio does not pass through the relay involved - the relay, when muted, simply shorts the output.
TROUBLE-SHOOTING There are a number of possible symptoms of something not quite right, some may be interfacing, others we will touch on as well. On the back panel are balanced and unbalanced inputs and outputs. Usually we connect balanced outputs to balanced inputs (same with unbalanced) but usually we can also patch an unbalanced to balanced or balanced to unbalanced with no problem (especially true with transformers) but some gear you can't. Check the manuals if you find a problem.
IT MAKES NOISES WHEN THE FRONT PANEL IS TAPPED - An easy one. Some tubes become microphonic over time. That means they start acting like a bad microphone. Vibration has caused the supports for the little parts in the tube to loosen and now the tube is sensitive to vibration. Easy - Replace the tube. Which one? The one that makes the most noise when you tap it - probably the 5814. It will have to be on , connected and speakers up but not too loud (save the speakers). IT GOT HISSY - Also easy.
SPECIFICATIONS Manley Enhanced Pultec EQP1-A Equalizer Maximum Input (Bypass through Line Amplifier) +30 dBv Maximum Output +30 dBv Headroom (referenced to +4 dBv) 26 dB Frequency Response: 10 Hz to 70 kHz +/- 0.5 dB THD & Noise (1kHz @ +4 dBm) .
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 Or you may fax this page to: (909) 628-2482 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.
