The MP-3 preamplifier is based on the concepts pioneered by our MP-1 preamp in a single chassis. Recently updated to Mk 3.3, the MP-3 is a fully
differential all-tube preamplifier with a direct-coupled high current output capable of driving low-impedance balanced-lines. The MP-3 easily
drives interconnects over 200 feet long! The MP-3 extracts more ambient information with greater image specificity, bass definition and dynamic range than any
single-ended preamplifier, owing to its patented direct-coupled output. Furthermore, it perfectly complements the balanced design of our amplifiers or any
balanced power amplifier. The patented innovations, developed specifically for this preamplifier, make the MP-3 one of the best preamps made today.
Balanced line technology has been in use in the recording and broadcast industry for decades, and is why the high fidelity era began in the early 1950s,
long before exotic interconnects existed. Balanced lines sound better than single-ended cables; are dramatically more resistant to RF, hum, cable artifact
and cable length. The low impedance balanced line system is a means of preventing interconnect cables from having a sonic signature. The MP-3 supports
this system, so you can run long cables with no need for exotic interconnects and still get exemplery performance.
In addition to its remarkable line section, the MP-3 works well with low-output moving coil cartridges and uses a minimum of
connections in the front panel wiring and controls. A low number of gain stages (only three from phono input to line level output)
insures low distortion, wide bandwidth and superb dynamic range. The result is a truly musical package of exceptional value.
- Balanced Differential Design®
- XLR connectors for phono and auxiliary inputs (paralleled RCA inputs optional)
- Regulated high voltage standard with Mk3.3 iteration (this used to be a $700 option)
- 2-stage Constant Current Sources for each stage of gain (improves performance of each gain stage)
- Dual XLR outputs standard (RCA outputs optional)
- Patented direct-coupled Circlotronic® output
- Zero feedback design throughout
- Balanced differential passive phono equalization
- Precision 23 position stepped volume control built with 96 resistors on a custom built switch
- Two tape monitor inputs, tape functions use RCA jacks
- Precision components used throughout
- Total system phase switch
- Low-noise "star" grounding topology
- additional options; click on 'Order' above
- Three-year general coverage warranty with one year warranty on output tubes
- for options click on 'Order' above
Line stage frequency response
1 Hz-200 KHz, +0 dB, -2dB
Line stage gain
15 dB
Line stage input impedance
100 Kohm Ω single-ended / 200 Kohm Ω balanced
Line stage output
12V
Output impedance
250 Ohms from 2Hz to 400KHz
Phono stage input impedance
47 K Ω, adjustable with rear panel loading strip
Phono stage input overload
500 mV
Phono stage max output
( at clipping )
120 V peak-to-peak
Phono stage gain
55 dB
Phono bandwidth
.5 Hz-90 KHz within ½ dB
RIAA accuracy
Within .1 dB
RIAA Phono sensitivity
( for 0.5 V @ 1 KHz )
0.2 mV
Power Supply storage
50 Joules
Tube complement
7 x 12AT7
2 x 6SN7GT
2 x 12AU7
Dimensions
13" deep x 17" wide x 5.5" tall ( 33 x 43 x 14 cm )
Faceplate dimensions
( standard 3U rack, sans mounts )
19" wide x 6" tall ( 48 x 15 cm )
Weight
19 lbs. ( 8.6 kg )
Warranty
Three years, transferable
One year for tubes
For all support requests, or any questions about your Atma-Sphere product, contact us directly at (651) 690-2246 or send us an
email.
Available with Low Output Moving Coil phono section, or as line stage only.
Optional Features
V-CAP Copper foil capacitors for line stage
V-CAP Copper foil capacitors throughout
Caddock resistor package
Caddock volume control
Low output Moving-Coil step-up transformers
for cartridges under 0.2 mV
Damping package
Switchable Tape head input with EQ
Front Panel finish options
Black
Silver
Brushed Gold (Anodized)
Custom panel finishes available upon request
Cables
Balanced Interconnects
Balanced phono cables
1 meter, DIN to XLR or RCA with ground post to XLR
Pricing
Contact your local
dealer for pricing information.
Or, call (651) 690-2246 or
email us with any questions.
