742 Selby Av. St. Paul, MN 55104 6516902246 atmasphere.
CONGRATULATIONS! You have purchased one of the world's finest preamplifiers and certainly one of the most unique. It was over fifteen years in development and represents a level of performance that others will be struggling to achieve for years to come. At the time of this writing, it is the only fully balanced differential vacuum tube design in the world and undoubtedly heralds a new breed.
LIMITED WARRANTY ON Atma-Sphere Music Systems, Inc. Products This warranty on your Atma-Sphere Music Systems, Inc. product, which is distributed and warranted by Atma-Sphere Music Systems, Inc., shall remain in effect for three (3) years from the date of consumer purchase, provided the enclosed registration form is completed and returned to Atma-Sphere Music Systems, Inc. within ten days of purchase. WHAT IS COVERED: Except as specified below, this warranty covers all defects in materials and workmanship.
MUSIC PREAMPLIFIER SETUP AND OPERATION Unpack the preamplifier carefully and save the packaging containers for future shipment if required. During operation, the MP3 gets warm. Adequate ventilation is mandatory. If the preamplifier is to be placed in a shelf or rack mount system, allow for at least 2 inches of open space above the unit. Make sure that the preamplifier is at least a foot away from any power supply, to avoid hum problems.
generate a temporary DC offset while they are operated. This effect will vary depending on the balance of the sections in the 12AU7 used in the high level section. Due to the nature of the MP3, expensive cables between the preamplifier and power amplifier are less important. The cable differences you hear will be minor compared to single-ended cables. Thus we have no recommendation for cables to be used between the preamplifier and power amplifier.
High-Level Hookup The auxiliary inputs are high impedance. Thus you may use any input as a source for the MP3. If you are using a low impedance source, a low impedance termination is recommended for better sound. A single-ended source can also be used, by applying the signal between either pin two or pin three of the input XLR, and ground. The unused input (pin three or pin two, respectively), may have to be shorted out to prevent noise.
Ringing or 'bell' sound when operating volume (microphonics): Usually the 12AU7 in the line stage is the most likely to cause this fault. The 12AT7s in the phono section can do this too. If the MP3 is OK on AUX inputs, but rings on the phono, then a 12AT7 is most likely at fault. LED lit up continuously: Check the 6SN7 in the channel associated with the LED. If only channel is lit, try swapping the left and right 6SN7s. The lit LED should now be in the other channel.
WARRANTY REGISTRATION FORM IMPORTANT: This form must be filled out and returned to Atma-Sphere Music Systems, Inc. within 10 days of purchase to validate the warranty! Please type or print clearly.
