MANLEY LABORATORIES, INC. OWNER'S MANUAL ENHANCED MID FREQUENCY PULTEC 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 WARRANTY 13 WARRANTY REGISTRATION 14 APPENDIX: WIRING YOUR OWN CABLES ? TEMPLATE FOR STORING SETTINGS
INTRODUCTION THANK YOU!... for purchasing the Manley Laboratories Enhanced Pultec Mid Frequency Equalizer. The all-tube Mid Equalizer utilizes the original WESTERN ELECTRIC passive-equalization circuit found in the long-out-ofproduction and justifiably famous PULTECS. According to experts, Western Electric developed the passive EQ in the 30's to improve speech quality in a typical telephone system. This may help to explain the choice of curves and frequencies.
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 not a boost/cut knob in each band?". We don't know why it was designed that way for sure. It was designed in the 1930's by Western Electric to improve voice through telephone lines. We believe it was done this way because it was the most practical in a simple passive design.
PEAK 200 300 500 700 1000 IN 4 .7 1 1.5 2 8 9 1 DIP 4 7 3 2 BYPASS 3 5 6 .4 4 1.5 2 3 4 PEAK 5 6 4 7 8 3 2 1 10 5 6 7 8 3 2 9 1 10 5 9 10 MID - FREQUENCY EQUALIZER HANDCRAFTED IN CHINO, CALIFORNIA Hz LOW FREQUENCY .3 .2 kHz 7 5 HIGH FREQUENCY kHz A IN / BYPASS - Bypass, of course, disables the EQ function. The signal always passes through the tubes. B Hz LOW FREQUENCY - Determines frequency at which maximum low frequency PEAK occurs.
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 mains voltage as 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 normally 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 (usually 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 Mid Frequency 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.