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INTRODUCTION 

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 Stereo 
90 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.   So please, take the time to read 
through this short manual so that you can be confident that you have set up your 
amplifier properly. 

UNPACKING THE STEREO 90 POWER AMPLIFIER 

Tools required:

  #  2 Philips Screwdriver 

WARNING - This amplifier uses voltages that could cause injury or 
death. Never open the amplifier while it is plugged in, and always wait 
at least one hour after turning the unit off to unplug and open the unit.  

Lethal

 voltages can remain in the electronics after the unit is 

unplugged. 

The Stereo 90 amplifier has been painstakingly inspected for cosmetic flaws 
during and after assembly.  In order not to damage the cosmetic appearance of 
your amplifier it is important that you follow the unpacking instructions carefully. 

1.

 

Remove the Styrofoam packing material from the box, and remove the two 
small white boxes. One of the boxes contains the Output Tubes, while the 
other contains the power cord.  

2.

 

Lift the unit from the box, and carefully remove the protective plastic bag. 
Remove the shipping pallet from the bottom of the amp. The pallet serves two 
purposes. First, and foremost it acts to tie down the mechanically isolated 
transformer platform. Secondly, it provides strength to the main chassis. Both 
of these are critical to ensure that no damage occurs in transit. 

3.

 

Save the packing materials. The packing materials and box have been 
carefully designed to protect your valuable equipment during shipping so you 
don’t want to throw them away.   

4.

 

Remove the top cover of the amp using a #2 phillips screw driver to remove 
the 10 cover screws. Using a glove or a clean dry cloth , install the tubes using 
the diagram in Figure 1. The Output Tubes will have a label designating their 
proper locations.  

Summary of Contents for Stereo 90

Page 1: ...Stereo 90 Vacuum Tube Power Amplifier Owner s Manual Rogue Audio Inc 3 Marian Lane Brodheadsville PA 18322 Issue date 03 10 04...

Page 2: ...g the Stereo 90 power amplifier 2 3 Installing the Stereo 90 into your system 3 4 Operation of the amplifier 5 5 Setting the tube bias 6 6 Troubleshooting 7 7 Owner and Warranty Registration Form 7 8...

Page 3: ...ugged The Stereo 90 amplifier has been painstakingly inspected for cosmetic flaws during and after assembly In order not to damage the cosmetic appearance of your amplifier it is important that you fo...

Page 4: ...et to 8 ohm To switch impedance setting 1 Using a wrench remove the outermost nut from the positive red binding post 2 Remove the 8 ohm tap green wire marked 8 from the binding post Be careful to leav...

Page 5: ...posite end into the power outlet It is recommended that the Stereo 90 and your preamp are plugged into the same wall outlet if possible perhaps using a power outlet strip to avoid creating a ground lo...

Page 6: ...ways that the output transformer can be connected to the tube circuit 1 Tetrode or Pentode connection In this configuration the highest power level is achieved but at the expense of significantly hig...

Page 7: ...bout any of these instructions please contact your dealer and have them bias the amplifier for you 1 Allow the amplifier to warm up for at least 30 minutes 2 Turn the preamplifier volume completely of...

Page 8: ...meter reading can be attained check the fuse 1 4 Amp fast blow If the fuse is bad replace the fuse and then set the bias If the bias will not maintain itself and the fuse blows again the tube should b...

Page 9: ...Fuses 4 2 10 Amp slow blow SPECIFICATIONS output power 90 WPC frequency response 5Hz 50 kHz 1dB THD 0 1 typ 1 at rated power input sensitivity 1 0 V RMS dimensions 14 W x 19 D x 7 H weight 60 pounds 2...

Page 10: ...ue Audio lightening power surges or acts of God Use of any other than Rogue Audio factory parts may void this warranty This warranty does not cover the cost of parts and labor which would be otherwise...

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