www.radialeng.com J33 Phono Preamp DI User Guide Radial Engineering 1638 Kebet Way, Port Coquitlam BC V3C 5W9 Tel: 604-942-1001 Fax: 604-942-1010 email: info@radialeng.com Radial Engineering is a division of C•TEC (JP CableTek Electronics Ltd.
True to the Music Radial J33 Phono Preamp DI Users Guide Table of Contents Page Introduction 2 Feature Set 3 Input panel 4 Output panel 5 Making Connections 6 FAQ 7 Specifications 9 Warranty Back cover WELCOME Congratulations on your purchase of the Radial J33 combination phono preamp and turntable direct box.
True to the Music INTRODUCTION Since the advent of the compact disc, the use of long-playing records has become so sparse that it has become difficult to find a hi-fi receiver that is equipped with a phono input. With literally millions of albums floating around the world, a need has emerged to capture these recordings and transfer them to today’s digital formats.
True to the Music RIAA RESPONSE CURVE FEATURE SET The J33 features a pair of stereo inputs for the turntable. A ground lug is provided to properly ground the turntable to avoid system noise. This signal then feeds the RIAA preamp that boosts the phono signal while introducing the RIAA equalization curve. Next to the turntable inputs are a series of unbalanced -10dB consumer line-level outputs.
True to the Music INPUT PANEL FEATURES 1 2 3 4 6 5 7 1. LED power indicator For left and right channels. Lights when the 15VDC power supply is connected or when phantom power is applied from a mixing console. 2. Rumble filter Applies a high pass filter when pushed in. 3. Gound lug Attatch the turntable ground lug here. 4. 3.5mm stereo output (thru-put) Paralleled stereo output for direct connection to computer sound cards, laptops or any device with a 3.5mm input. 5.
True to the Music OUTPUT PANEL FEATURES 8 11 9 10 8. Bookend design 14 gauge steel outer shell creates protected zone around connectors and switches and wraps around a welded case with I-beam construction for maximum durability. Finished in tough baked enamel. 9. Left and right XLR outputs Balanced and low impedance (600Ω) microphone level output. Connect to sound system inputs or main mixing console. 10. 15V DC power supply connection The 15VDC supply is connected here for powering the J33.
True to the Music MAKING CONNECTIONS Using the Radial J33 is easy. Before connecting, start by making sure all volume levels are set to zero and the audio system is turned off. This will avoid any loud pops in your sound system that could cause system damage. Begin by connecting the turntable outputs to the J33 using the RCA connectors and securing the ground lead from the turntable to the ground lug on the J33.
True to the Music Mixing Console MP3 Player Dashed line represents turntable ground wire. CD-R Recorder FAQ What is an RIAA pre-amp and why do I need one with a turntable? Because when the album was produced, a preset EQ curve was introduced so that on playback you would get better sound. Keep in mind that when stereo long-play records first appeared some 60 years ago, the transfer was vibration caused by minute bumps inside the groove.
True to the Music What should I do if I depress the rumble filter and still have feedback? Try using an isolation pad such as the Primacoustic IsoPlane (www.primacoustic.com). This will reduce the vibration going into the turntable and help eliminate low frequency resonant feedback. Can I use the Radial J33 for other devices such as keyboards or computer sound cards? No. The J33’s input is pre-equalized with the RIAA curve.
J33 BLOCK DIAGRAM J33 Specifications (subject to change without notice) Freq. Response (RIAA curve) +19.15dB @ 20Hz to 19.65dB @ 20kHz (Ref: 0dB @ 1 KHz) Total harmonic distortion 0.005 % @ 1 KHz RIAA deviation +/- .5dB maximum Max. phono input level 50mV @ 1 KHz High pass filter 200Hz cut off, -3dB at 100Hz Unbalanced outputs 10kOhm, -10dB line-level Balanced outputs 600 ohms, -60dB mic-level, pin 2 hot Power (auto-switching) 15v DC or 48v phantom Size (W x D x H) 3.25”x 5”x1.
RADIAL ENGINEERING 3 YEAR LIMITED WARRANTY RADIAL ENGINEERING (a division of J.P Cabletek Electronics Ltd.) “Radial” warrants this product to be free from defects in material and workmanship to the original owner and will remedy any such defects free of charge according to the terms of this warranty.
