Manley Labs MM/MC GRAMOPHONE CARTRIDGE PREAMPLIFIER manuale d’uso

MANLEY LABORA TORIES, INC. OWNER'S MANUAL MANLEY STEELHEAD V ersion 2 MM/MC GRAMOPHONE CAR TRIDGE PREAMPLIFIER MANLEY LABORA T ORIES, INC 13880 MAGNOLIA A VE. CHINO, CA. 91710 TEL: (909) 627-4256 F AX: (909) 628-2482 emanley@manleylabs.com http://www .manleylabs.com Rev . 8-24-2004 LH[...]

CONTENTS INTRODUCTION 3 INSTALLATION PRECAUTIONS 4 FEATURES AND APPLICATIONS 5 OPERATIONAL NOTES 9 TROUBLESHOOTING 12 SPECIFICATIONS 14 WARRANTY 15 WARRANTY REGISTRATION 16 SECTION P AGE[...]

THANK YOU!... ...for choosing The MANLEY STEELHEAD phono preamplifier . Please read over this manual carefully as it contains information essential to the proper operation and maximum enjoy- ment of this fabulous instrument. The MANLEY STEELHEAD is designed to provide that rare combination of maximized sonic performance coupled with a generous abil[...]

INST ALLA TION PRECAUTIONS a) Avoid locating the preamp where it will be exposed to direct sunlight, excessive humidity, dust or moisture. Extreme environments may temporarily or permanently degrade preamp performance. b) Keep the preamp housing away from sources of strong magnetic field radiation, such as large video display CRTs, large power line[...]

FEA TURES AND APPLICA TIONS 1. HIGH PERFORMANCE FRONT END The STEELHEAD preamplifier makes the best use of active and passive component and circuit developments generated over the past half-century. The hybrid cascode gain blocks simultaneously deliver wide-band high-gain, low noise and low distortion performance without having to resort to heavy-h[...]

3. SWITCH-SELECTABLE CARTRIDGE LOAD IMPEDANCE An effective means of varying the load seen by the MC cartridge has been included in the form of a 5-position rotary switch. This switch selects various taps on a specially manufactured dual-primary bi-filar wound, high-bandwidth low-resistance and multiple-shielded nickel-core step-up autoformer. A dra[...]

Each cartridge manufacturer’s product will work best in a laboratory sense when terminated (loaded) with a certain amount of resistance and capacitance. By lab sense it is meant that the signal developed by the cartridge is at maximum power transfer into the pre-amp, with minimum overshoot and ringing, flattest frequency response and gentle roll-[...]

7. LINE INPUT SELECT BUTTON The LINE switch routes external line level signals to the top of the feature switch stack, and through the VOLUME control. In this way, an external signal source may be manipulated by the SUM, DIM and MUTE switches, along with the volume control, before transmission to any downstream power amplifiers. Notice here that th[...]

OPERA TIONAL NOTES BEFORE POWER-UP Once placed, join the power supply cable to the pre-amplifier via the large16-pin circular connector. The 16-pin connectors are keyed and can only be mated when both halves are lined up correctly. Check and make sure the power supply is switched off, then attach the grounded IEC power cable jack to the IEC plug. K[...]

The winking MUTE lamp indicates the beginning of a 30 second warm-up mute delay, during which time the muting relay is engaged; no output will be heard from the preamp. DURING OPERATION Once audio is heard from the STEELHEAD the exploration for the ideal control settings can begin. However it would be best to allow about 15 minutes of warm-up time [...]

Let the preamp tube(s) cool down, if necessary, before handling. Tube heater filaments are somewhat more suceptable to damage when warm or hot. Each tube should require only moderate force for removal and replacement. Gently rock the tube back and forth a bit during removal or replacement. Avoid bending the circuit board. Notice that the heaters of[...]

TROUBLESHOOTING The STEELHEAD’s system architecture is designed with a variety of features so as to allow flexibility in accommodating as many cartridges and as much downstream gear as possible. Access to these capabilities rest on the assumption that all STEELHEAD systems are functioning properly. If trouble is encountered please review the foll[...]

Symptom Possible Cause Corr ective Action, cont’d Lights ON, no output Open 6922 filament, either Check for glowing 6922 either channel after warm channel. 6922 unplugged. filaments. Replace if up delay times out. necessary. Output MUTE function UnMUTE the preamp. activated. Hum heard on unused Input connectors are non- Avoid unused inputs; insta[...]

SPECIFICA TIONS Vacuum tube compliment: 6922 x 2 (gain) plus 7044 x 4 (output buffers) Fuse type and ratings: 117 VAC: 1.5 Amp 3AG slow-blow main 0.5 Amp 3AG slow-blow logic 234 VAC: 0.75 Amp 3AG slow-blow main 0.25 Amp 3AG slow-blow logic Moving Magnet input impedance: 5-step user adjustable via fixed low-noise resistors. 25, 50, 100, 200 and 4700[...]

W ARRANTY 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 transferrable warranty is available upon proper registration of ownership within 30 days of date of first purchase. [...]

W ARRANTY REGISTRA TION We ask, grovel and beg that you please fill out this registration form and send the bottom half to: MANLEY LABORATORIES REGISTRATION DEPARTMENT 13880 MAGNOLIA AVE. CHINO, CA. 91710 USA Or you may FAX this form in to: +1 (909) 628-2482 or you may fill in the online warranty registration form found in the Tech Support section [...]