Manley Laboratories Microphone Preamplifier. We use this manual for both the MONO and DUAL MONO versions. They are identical except the DUAL has two of everything. These are all-tube Microphone Preamplifiers chock full of nice audiophile parts that combine flat frequency response, very high headroom, low noise, and low distortion with a big rich beefy sound.
MAINS CONNECTIONS Your preamplifier 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 or side panel. Check that this complies with your local mains supply. Export units for certain markets have a molded mains plug fitted to comply with local requirements.
BASICS This Microphone Preamp, like most mic preamps, is pretty easy to use. First we can discuss why outboard mic pre's have become "a must have item" in almost every studio even though your console probably has a bunch of them and that manufacturer claims that they are really great and you don't need outboard mic pre's.
(provided that the PHASE SWITCH is set to "0˚") There is a 1/4" (mono) jack on the front panel for plugging instruments in directly. It is not quite the same thing as a "Direct Box" designed for guitar or bass but it works fine and is remark- able with keyboards.
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This Mic Pre also has two outputs for each channel. One is balanced and one unbalanced. The XLR is a true transformer balanced output. The 1/4" mono (tip -sleeve) jack is unbalanced and gets its signal before the transformer. The XLR PIN OUT is: The 1/4"...
OPERATIONAL NOTES SWITCHING ON Allow this unit a few minutes for the tubes to warm up before use. It is not recommended that you leave your preamplifier permanently switched on. This only wastes electricity and tube life. Your preamplifier has solid state rectification and reaches peak operating condition in approximately 30 minutes.
CHANNEL B POWER CHANNEL A MANLEY 48V ON 48V ON 0º 0º DIRECT DIRECT DUAL MONO MICROPHONE PREAMPLIFIER 180º 180º PHANTOM DESIGNED BY DAVID MANLEY PHANTOM HANDCRAFTED IN CHINO, CALIFORNIA INPUT ATTENUATE INPUT ATTENUATE I J K LED PHANTOM INDICATOR Illuminates when 48V phantom power switch is activated on channel A.
GROUND normally joined together. Used for finding and fixing hum. BALANCED OUTPUT B (XLR) (transformer), PIN 1 = GROUND PIN 2 = HOT PIN 3 = LOW UNBALANCED OUTPUT B (1/4" MONO) , SLEVE = GROUND TIP = SIGNAL BALANCED OUTPUT A (XLR) (transformer), PIN 1 = GROUND...
SPECIFICATIONS Vacuum Tubes: 1 x 12AX7LPS, 1 x 6414 per channel Frequency Response 20 Hz - 60 KHz ( +/- 1 dB) .05% @ 1kHz, +4 dBv out Signal to Noise Ratio 80 dB or better typical depends on settings and tubes Maximum Output +32 dBv ( 70 volts RMS ! ) +15 dBm into 600 Ω...
TROUBLE-SHOOTING NO POWER, NO INDICATORS, NADA - Probably something to do with AC power. Is it plugged in? Murphy's Law. Check the fuse on the back panel. A blown fuse often looks blackened inside or the little wire inside looks broken. A very blackened fuse is a big hint that a short occured.
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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.
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.
PURCHASE DATE ______________ SUPPLIER ______________________ -------------------------------------------------------------------------------------------------------- PLEASE DETACH THIS PORTION AND SEND IT TO MANLEY LABORATORIES MONO MICROPHONE PREAMPLIFIER SERIAL No. ________________ DUAL MONO MICROPHONE PREAMPLIFIER PURCHASE DATE __________________________ SUPPLIER _______________________ NAME OF OWNER ___________________________________________________________ NAME OF STUDIO ___________________________________________________________ ADDRESS ___________________________________________________________________...
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