D E S I G N E D A N D M A N U F A C T U R E D B Y 279 0 BR IG HTO N R OA D, O AK VIL LE , ONTA RIO , C A NA DA S o n i c F r on t i e r s c a n b e r e a ch e d 9 : 0 0 a m t o S O N I C L 6H 5T4 6 :0 0 p m F R O N T I E R S I N C O R P O R A T E D T EL: (9 0 5) 82 9 -383 8 ( E . S . T. ) o r 2 4 h ou r s FA X: (90 5) 8 29- 303 3 a d a y b y f a cs i mi l e .
ANTHEM PRE 1 OPERAT ING M A NU AL
TECHNICAL SPECIFICATIONS (AC line set at 117V 60Hz) FREQ UEN CY RE SPONSE: Line input: ± 0.5dB 10Hz to 85kHz, -3dB below 5Hz and above 200kHz Phono Input: ± 0.5dB of RIAA 20Hz to 20kHz CHANNE L SEPA R AT I O N : (Line Stage): < -75 dB Below 1V @ 1kHz, < -65dB Below 1V @ 20kHz, (Phono Input to Line Stage Output): < -55dB @ 1kHz, < -55dB Below 1V 10Hz to 20kHz P H A S E : Phono to Tape outputs: Non-inverting, Line in to Main output: Inverting HARMONIC DISTO RTION: (THD+N): Less than 0.
We at Sonic Frontiers hope you will derive many years of listening pleasure with your new Anthem Pre 1. This Operating Manual contains important information regarding the operation and care of the Pre 1. Be sure to read this manual carefully and follow these instructions in order to keep it performing and sounding its best. Please contact Sonic Frontiers if you have any questions, a Customer Service Representative will be pleased to assist you.
A B D E C F G H
CONTROL A FUNCTIONS SELECTOR S WIT CH E This knob is rotated to select a Line Level Input (N) or the Phono Input (P). The Selector Switch is bypassed when the Tape/EPL(External Processor Loop) mode is selected by depressing the Tape/EPL-Source button (D). B This Light Emitting Diode has three status conditions identified by different displays.
I J K L M N O P
CONNECTION I FUNCTIONS D E TACHABLE AC PO WER CO RD SOCKET Plug the Detachable Power Cord into this socket (see Figure 4). The Pre 1 is factory set for the correct operating voltage for the area in which it is sold (see shipping box for voltage setting). If a different operating voltage is required, please contact an authorized Sonic Frontiers or Anthem dealer, distributor or the factory directly.
WARNING- DISCONNECT THE AC DETACHABLE POWER CORD FROM THE PRE 1 AND WAIT 5 MINUTES BEFORE REMOVING COVER, TUBES OR FUSE. SETTING UP The Pre 1 comes with seven tubes, as follows: 5AR4 R ECTIFIER TUBE The tube socket for this tube is located in the power supply. This tube functions as a full wave rectifier, converting the AC supply to DC. A tube was chosen for this function because a semiconductor tends to sound harsh in this application.
FUSE FUSE LOCATION LOCATION LV1 LV1 & & V1 V1 6922s 6922s LV2 LV2 & & V2 V2 12AT7s 12AT7s LV3 LV3 & & V3 V3 6922s 6922s 5AR4 5AR4 Hi/Lo Hi/Lo gain gain switching switching SETT ING UP THE P HONO STA G E CARTR IDGE LOADING - RE SIS TA N C E Slide the high/low switches (labeled in the top view photo) to the desired gain setting. The High gain setting is typically for MC-Moving Coil or low to medium output cartridges of 0.2mV to 1.0mV; the Low setting for MMMoving Magnet cartridges of 1.0mV or greater.
CARTR IDG E L OADING - CAPA C I TA N C E With some phono cartridges (both MM and MC), the addition of some capacitance loading to the cartridge may prove beneficial in “taming” any high frequency resonance or response peaks inherent in the design of the cartridges. Typical capacitance values for MM cartridges are in the range of 100 to 250pf. We suggest that you discuss the possible loading requirements of your cartridge with the dealer where you purchased the cartridge or with the cartridge manufacturer.
Muting the Pre 1 is achieved by placing the Mute/Operate button (G) in the MUTE position (button depressed); the output signal is then cut off. To resume listening, place the button in the OPERATE position (not depressed). • The AC power fuse is intact and has not blown. If the fuse has blown, the thin metal conductor will have melted and the glass may appear “smoked”. If the fuse has blown, replace with a fuse of the same rating (1.5 Amp/250V fast-blo for 100 to 120 volt countries and .
PLACEMENT F OR PROPER VENTILAT I O N DISCLAIMER OF LI ABILITY Allow at least 4” (15 cm) of clear space above the Pre 1 chassis for proper ventilation, making sure the air vent slots in the chassis cover remain unobstructed. Also, be sure that the Pre 1 is placed on a secure, hard and level surface. Under no circumstances does Sonic Frontiers, Inc.
before any product is returned to our factory for any reason. This number must be visible on the exterior of the shipping container(s) for Sonic Frontiers to accept the return. Units shipped to us without a Return Authorization Number or without a visible RA Number on the exterior of the shipping container(s) will be returned to the sender, freight collect. Units to be repaired by Sonic Frontiers, Inc. must be sent shipping and insurance prepaid by the original purchaser in the original packing material.
U P D AT E T O T H E A N T H E M P R E 1 M AN U A L Changes to the location of the high and low gain switches - refer to “SETTING UP THE PHONO STAGE” in this manual. The high and low gain switches have been removed from the main board and moved to the sub circuit board which contain the Balance and Vo l u m e controls. Refer to this diagram to locate the switches when setting up the the Anthem pre 1 phono stage.