Rogue Audio Atlas Vacuum Tube Power Amplifier Owner’s Manual Rogue Audio, Inc.
TABLE OF CONTENTS 1) Introduction 2 2) Unpacking the Atlas power amplifier 2 3) Installing the Atlas into your system 3 4) Operation of the amplifier 5 5) Setting the tube bias 5 6) Troubleshooting 7 7) Fuse values 8 8) Specifications 8 9) Product Registration and Warranty 9 INTRODUCTION 1
Congratulations on your purchase decision! We at Rogue Audio truly believe that our amplifiers provide the “smartest” value in high-end audio. If you have never owned a vacuum tube amplifier you will be thrilled by the silky-smooth sound and incredible detail that only a tube amplifier can provide. And with the Atlas amplifier, you can be sure that you are getting the very best in tube amplification. We at Rogue Audio are extremely proud of our products and want you to enjoy them to their fullest potential.
Left Channel Binding Post Right Channel Binding Post Potentiometers Bias Meter Bias Switches Figure 1 Tube and Deck Layout INSTALLING THE ATLAS INTO YOUR SYSTEM Connecting Atlas to the Loudspeakers: The Atlas provides options for either 4 or 8 ohm speakers. The impedance selected will depend on the speakers used. Consult either the owner’s manual for your speaker or your local dealer to determine the correct choice. The amplifier is factory set to 8 ohm.
CAUTION – Do not operate the amplifier unless it is connected to a loudspeaker. Connecting ATLAS to the preamplifier: The input connections from the preamplifier are made via RCA jacks on the rear of the amplifier. See figure 2. Be sure to use high quality interconnect cables as they do make a difference Note that if you have a variable output CD player you can drive the ATLAS with it directly. Main Fuse Right Channel Binding Post Left Channel Binding Post RCA Inputs Power In Figure 2.
OPERATION OF THE AMPLIFIER After all proper connections have been made, you are now ready to turn the Atlas amplifier on. The power on/off switch is on the front of the amp. Some preamplifiers and sources can generate dangerous transients that can damage loudspeakers. To avoid letting dangerous transients reach your loudspeakers turn your system on in the following order: 1) 2) 3) 4) 5) Turn on all sources (CD, tuner, etc.) that you will be using. Turn on the preamplifier. Wait until preamp has stabilized.
Figure 3. Removable hatchplate 1) Allow the amplifier to warm up for at least 30 minutes. 2) Turn the preamplifier volume completely off so that no signal is entering the amplifier 3) Loosen the 2 captive screws on the top hatch cover. 4) Remove the hatch cover. 5) The bias tool is snap attached to the top deck cover behind the power transformer. Refer to Figure 1. 6) Locate the toggle switches and associated small potentiometers (they are blue and have a small screw in the top).
9) Flip the switch back into the “run” position thus disengaging the tube from the meter circuit. 10) Repeat the above steps for each of the tubes in both channels. As it is a quick operation, the tube bias should be checked on a regular basis. Note that the bias will change slightly on a day to day basis as the wall voltage fluctuates. Constant biasing will wear out the bias potentiometers prematurely so do not adjust the bias unless it is more than 4-5 mA from the correct setting.
FUSE VALUES Main fuse located on rear panel (1) – 5 Amp slow blow Tube Fuses (4) – 1/4 Amp slow blow Power Supply Fuse on PCB (1) – ¾ Amp slow blow SPECIFICATIONS output power 55 WPC frequency response 5Hz – 50 kHz ± 1dB THD < 0.1% typ, < 1% at rated power input sensitivity 1.0 V RMS dimensions 18” W x 17” D x 5.
OWNER AND WARRANTY REGISTRATION FORM Included with this manual is an Owner and Warranty Registration Form. Please take a minute to fill out this card and return it to Rogue Audio. This card must be returned within 30 days of purchase to validate the warranty. LIMITED WARRANTY Warranty Period This product has been manufactured under the highest standards of quality and workmanship. Rogue Audio Inc.
