Rogue Audio Stereo Amplifier Stereo 90 User Guide

Stereo 90  
Vacuum Tube Power Amplifier  
Owner’s Manual  
Rogue Audio, Inc.  
3 Marian Lane  
Brodheadsville, PA 18322  
Issue date: 03/10/04  
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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.  
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Left Binding Post  
Right Binding Post  
Bias Meter  
V1  
V2  
V3  
V4  
Potentiometers  
Rotary Bias  
Switch  
12AX7  
Bias Tool  
6SN7  
Figure 1 Tube and Deck Layout  
INSTALLING THE STEREO 90 INTO YOUR SYSTEM  
Connecting the Stereo 90 to the Loudspeakers:  
The Stereo 90 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.  
To switch impedance setting:  
1) Using a ½” 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 leave the black wire with heat shrink on the post.  
3) Remove the polyurethane tubing from the unused 4 ohm wire (yellow) and  
lug.  
4) Place the 4 ohm wire onto the binding post and replace the outer nut.  
5) Place the polyurethane tubing on the 8 ohm wire and lug.  
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CAUTION – Do not operate the amplifier unless it is connected to a  
loudspeaker.  
Connecting the Stereo 90 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 –  
they do make a difference.  
Left Channel  
Binding Post  
Right Channel  
Binding Post  
RCA  
Inputs  
Ultra Linear/  
Triode Switch  
Power In  
Main Fuse  
Figure 2. Rear panel layout  
Connecting the Stereo 90 to the power outlet:  
Connect the IEC end of the detachable power cord (provided) to the amplifier,  
and plug the opposite 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 loop.  
Amplifier Location:  
The Stereo 90 depends on natural convection flow patterns for proper cooling. To  
ensure proper cooling, the unit should be located in a position so that the airflow  
is not impeded. The unit should not be placed in a fully enclosed shelf, and  
should have a minimum of 8 inches of free space above it, and 6 inches of free  
space on either side.  
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OPERATION OF THE AMPLIFIER  
After all proper connections have been made, you are now ready to turn the  
Stereo 90 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) Turn on all sources (CD, tuner, etc.) that you will be using.  
2) Turn on the preamplifier.  
3) Wait until preamp has stabilized.  
4) Power up Stereo 90 amplifier  
5) Select listening source and play music  
When powering down your system turn the amplifier off first.  
Note – Important! After turning off the amplifier, wait at least one minute to turn  
it back on. Do not turn it on then off and then on again in quick succession.  
Doing this will not allow the power supply to discharge between on/off cycling  
and may result in transient noises.  
Triode/Ultralinear switch:  
This switch is located on the back panel of the amp. See Figure 2. The output  
transformer of a tube amplifier acts as the electrical interface between the very  
different impedances of the loudspeaker and the tube circuitry. There are three  
fundamental 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 higher distortion levels.  
Practically speaking, this mode of operation is sonically inferior and has been  
disregarded in the Stereo 90 design.  
2) Triode connection – With this configuration, the lowest level of distortion is  
achieved but at the expense of output power. In the case of the Stereo 90, its  
power level in triode is high enough that it will likely provide plenty of power  
for almost any speaker load.  
3) Ultralinear operation – With this configuration, power levels near those of  
tetrode mode are achieved with low distortion levels that approach those of  
triode operation. For loudspeakers that demand very high levels of power,  
ultralinear should provide excellent sound and plenty of power.  
The triode/ultralinear switch allows the user to operate the Stereo 90 in either of  
the two modes. In general, the sonic differences are subtle but for a given  
loudspeaker one mode is likely to sound better than the other. There is a  
complex relationship between the output transformer and the crossover network  
so try both and see which one works best in your system. This switch can be  
operated while the amplifier is playing but you will hear a small relay noise  
through the loudspeaker.  
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SETTING THE TUBE BIAS  
Tools required: bias tool (provided with amplifier)  
The output tubes (the big ones) need to be “biased’ with a grid voltage that  
controls the flow of electrical current through the tube. Tube biasing on the Stereo  
90 amplifier has been designed to be both simple and effective. On some  
amplifiers biasing is done for two or more tubes simultaneously. With this  
method, the total current flowing through the group of tubes may be correct, but  
the current flow through any individual tube may vary significantly from the  
optimal value. With the Stereo 90 amplifier the bias is set individually for each  
tube so that the correct operating point is assured. An added benefit to this  
approach is that, should a tube fail prematurely, the single tube can be replaced  
without having to purchase a matched set. Use the following procedure to set the  
tube bias:  
WARNING – There are dangerous and potentially lethal voltages inside this  
amplifier. Do not touch any part of the amplifier other than as described  
below. If you are uncertain about 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 off so that no signal is entering the  
amplifier.  
3) Remove the top cover. The bias tool is snap attached to the inside top of the  
deck lid.  
4) Locate the rotary switch and associated small potentiometers (they are blue  
and have a small screw in the top). There are four, one for each tube. Note the  
biasing meter.  
5) Position the rotary switch into the corresponding tube position (ie. V1 for  
output tube V1).  
Note – There is a small leakage current of 5mA that flows through the  
meter’s shunt resistor during the tube bias setting operation. To accurately  
account for this, set the bias current at 5 mA lower than the desired setting.  
6) Using the bias tool, slowly turn the screw on the potentiometer that is adjacent  
to the switch until the bias meter reads ~ 35 miliamps (actually 40mA.) Turn  
the screw clockwise to lower the bias and counterclockwise to raise the bias.  
Note that there are two ends on the bias tool. Using the end with the recessed  
screwdriver will greatly facilitate this operation.  
7) Repeat the above steps for each of the four output tubes.  
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8) Rotate the switch back into the null (first) position for operation.  
As it is a quick operation, the tube bias should be checked on a regular basis.  
TROUBLESHOOTING  
Speaker Hum – If hum can be heard from more than a few inches from the  
loudspeaker, there is probably a ground loop. Be sure to have both the amp and  
preamp plugged into the same outlet if possible.  
Tube will not bias – If the meter provides a reading but the tube will not bias, the  
tube is probably bad. If no 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 be  
replaced.  
Bias Meter reading is too high – Check that you do not have two of the bias  
switches turned on.  
Output sounds distorted - Check the bias on the output tubes to ensure that the  
tubes are operating properly.  
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 15 days of purchase to validate the warranty.  
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FUSE VALUES  
Main fuse located on rear panel (1) – 5 Amp slow blow  
Tube Fuses (4) – 2/10 Amp slow blow  
SPECIFICATIONS  
output power  
frequency response  
THD  
90 WPC  
5Hz – 50 kHz ± 1dB  
< 0.1% typ, < 1% at rated power  
1.0 V RMS  
input sensitivity  
dimensions  
14 ½” W x 19” D x 7” H  
60 pounds (25 Kg)  
65 lbs (27 Kg)  
weight  
shipping weight  
power requirements  
115/230V - 50/60Hz  
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LIMITED WARRANTY  
Warranty Period  
This product has been manufactured under the highest standards of quality and workmanship. Rogue Audio  
Inc. (hereinafter “Rogue Audio”) warrants this product against defects in material or workmanship as  
follows:  
With the exception of vacuum tubes, Rogue Audio warrants to the original purchaser of this product all  
parts of this product against defects in material and workmanship for a period of three years from the date of  
retail purchase. Rogue Audio warrants the vacuum tubes for a period of six months from the date of retail  
purchase. Any defective parts will be replaced free of charge, excluding shipping and handling.  
Proof of purchase in the form of a bill of sale or recited invoice which indicates that the product is within  
the warranty period must be presented to obtain warranty service. Rogue Audio suggests that the purchaser  
retain the dealer’s bill of sale as evidence of the date of retail purchase.  
What’s Not Covered  
This warranty does not cover cosmetic damage or any damage that results from product misuse, product  
abuse, installation error, connection to an improper voltage supply, accident, improper maintenance,  
alterations, modifications not authorized in writing by Rogue 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 provided without charge  
under this warranty, obtained from any source other than Rogue Audio.  
This warranty applies only to consumer use of this product and does not cover any product that is used in  
any trade or business, or in an industrial or commercial application.  
This warranty applies only to the original purchaser of this product when purchased from an Authorized  
Rogue Audio dealer. This warranty is not transferable.  
This warranty is valid only in the United States.  
YOUR RIGHTS  
ROGUE AUDIO LIMITS ITS OBLIGATIONS UNDER ANY IMPLIED WARRANTIES UNDER STATE  
LAWS TO A PERIOD NOT TO EXCEED THE WARRANTY PERIOD. SOME STATES DO NOT  
ALLOW LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY LASTS, AND SOME STATES  
DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL  
DAMAGES, SO THE ABOVE LIMITATIONS OR EXCLUSIONS MAY NOT APPLY TO YOU. THIS  
WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND YOU MAY HAVE OTHER  
RIGHTS WHICH MAY VARY FROM STATE TO STATE.  
To Obtain Service  
To obtain service, you must contact Rogue Audio and obtain a return authorization number. The product  
must be delivered to Rogue Audio in its original packaging prepaid at the following address:  
Rogue Audio Inc.  
3 Marian Lane  
Brodheadsville, PA 18322  
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