Atma-Sphere Music Systems
160
So.
Wheeler
St.
Paul,
MN
55105
Phone:
651-690-2246
FAX:
651-699-1175
ATMA-SPHERE® MUSIC PREAMPLIFIER
Model
MP-3
OWNER'S
MANUAL
Please study this document carefully before using equipment
Page 1: ... Sphere Music Systems 160 So Wheeler St Paul MN 55105 Phone 651 690 2246 FAX 651 699 1175 ATMA SPHERE MUSIC PREAMPLIFIER Model MP 3 OWNER S MANUAL Please study this document carefully before using equipment ...
Page 2: ... do not have to wait all you have to do is set the preamplifier up by following the simple instructions in this manual Every part of the preamplifier has been extensively tested and engineered so the product will perform flawlessly for years to come with little if any service Please read the manual carefully and follow the instructions closely If you have any questions do not hesitate to contact y...
Page 3: ... a return authorization number from Atma Sphere Music Systems You are responsible for transporting the unit to Atma Sphere Music Systems 160 So Wheeler St St Paul Minn 55105 You must pay the initial shipping charges but Atma Sphere Music Systems will pay the return charges if the repairs are covered by the warranty All products MUST be shipped in the original carton s or in replacement cartons sup...
Page 4: ...nge a record etc After the preamplifier is turned on it takes about 30 seconds before it is ready for use During the warmup of the preamplifier one or both of the DC OFFSET LEDs on the front panel may light up This indicates that the servo circuit has detected a DC voltage at the output of the preamp and is trying to correct it If the indicator stays lit for more than a minute a fault is indicated...
Page 5: ...one arm cable with the right connections from almost any cable manufacturer If your arm has RCA connectors at the output an adaptor cable can be made that will work The shield connection of the RCA must become the connection to pin 3 of the XLR connector and the tone arm ground connection should be made as described above ON NO ACCOUNT should you allow the shield connection of the RCA to become th...
Page 6: ...high quality cable for best results and keep the cable as short as possible The minimum drive impedance is 20K ohms The tape 2 output is inverted while tape 1 is non inverted The tape monitors are a single ended non inverting high impedance input MP 3 tube locations NOTES ON TUBES 1 The 12AT7s in the upper left of the board are the most critical 6 NEVER use Tweek on vacuum tubes for low noise phon...
Page 7: ...side the associated 6SN7 They are in sockets and the ICs are available from Radio Shack or other electronic supply houses NEVER EVER USE TWEEK ON TUBE SOCKETS Tweek is an organic compound and is capable of forming resistance paths if it breaks down If none of these suggestions help please contact your dealer or ATMA SPHERE MUSIC SYSTEMS MORE TIPS AND TWEAKS You can reduce the noise level beyond th...
Page 8: ...NOTES ...
Page 9: ...________________________________________________________ Comments concerning this product _________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ ________________________________________________________________________...
Page 10: ...MAIL TO ATMA SPHERE MUSIC SYSTEMS 160 So Wheeler St St Paul MN 55105 USA ...
