**Please note extended handling time of 30 days on this listing as we work to clear our backlog of orders from our main website. Sales are extremely strong!!** - KPR 3/29/24
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MP7B: Fully-Discrete, Zero Negative Feedback, Single-Ended Class-A High-Voltage Pure J-FET (Junction Field Effect Transistor) Phono Preamplifier
Get truly high end, truly musical sound with hand-built USA quality, from an engineering team with 50+ years experience.
Zero Feedback, Single-Ended Class-A Gain Stages - No Op-Amps (Integrated Circuits) and no Differential FET operation - for more natural sound, cleaner crescendos and minimal listening fatigue
Enhanced Power Supply Regulation - Derived directly from the most elegant and technically sophisticated power supply ever utilized in a DLabs product (our MP8B). The MP7B uses a single version of this great power supply regulator. It allows a higher rail voltage that the predecessor, provides increased resilience against poor AC power, and provides superior clarity of sound, great ‘punch', soundstaging, power and dynamics.
LOMC capabilities built in
High Headroom Passive RIAA equalization
High-Voltage J-FETs -Hand-matched with hand-tuned operating points deployed in a maximum-inherent-linearity configuration
Extensive local decoupling networks provide deep, wide and immersive soundstaging
LED Color is (Blue) only, on the eBay listing - you can adjust the brightness with an internal setting.
Hand-soldered, assembled and calibrated by experienced US-paid craftsmen
Through-hole construction for electrolytic capacitors and other critical parts, conservatively rated, long life audiophile quality components
Listen 5 to 7dB louder without strain or fatigue than competitive products for greater perceived dynamics and musical immersion
Invites comparison to products up to $3000 or more
Detailed Feature List:
Gain is variable between +35dB, +37dB, +40dB, +49dB, +51dB, +54dB, +61dB, +63dB, +66dB, +67dB, +69dB, +72dB
LF EQ Trim (+0.75dB and +1.5dB at 20Hz, shelving response)
HF EQ Trim (-4dB to +4dB at 20kHz in shelving response, with many intermediate steps)
Subsonic Filter (switchable): Flat, or 16Hz HPF at 6dB/octave or 12dB/octave.
Variable Resistive loading for MM-level: 38K, 44K, 47K, 62K, 92K, 150K, 240K or 1Meg
Variable Resistive loading for LOMC-level: 60 ohm, 69 ohm, 82 ohm, 100 ohm, 150 ohm, 220 ohm, 470 ohm, or 62K.
Variable capacitance MM: 0pF, 50pF, 100pF, 150pF, 200pF, 250pF, 300pF, 350pF
Balanced output capability (with user-supplied custom connecting cable)
Balanced Power Supply Generation (BSG) for minimum background hum even in difficult or noisy AC line conditions
+68V Main Voltage Rail with 30V LOMC voltage rail.
Full-time Mono input strapping via internal jumper
User-variable LED Brightness.
SPECS:
Distortion: 0.07% THD, 1kHz at 0.5V out into 10K load; 0.007% 3HD and higher, 1kHz at 0.5V into 10K load
S/N: >78dB A-Wtd re: 5mV input with simulated inductive standard MM type cartridge as a source (40dB gain); >71dB A-Wtd re: 0.5mV input with 10 ohm load for LOMC input.
Maximum Output: 19V RMS (27.5dBu or 52V pk-pk) at 1kHz into 10K load.
Frequency Response: RIAA: +/-0.2dB from 20Hz to 20kHz
Bandwidth: -1dB at 7Hz and 70kHz.
Input Overload: 145mV at 1kHz input.
Size: 7” D x 5 1/8” W x 1 9/16” H. Weight: 2.5 lbs. Packed weight: 3.5 lbs.
External Power Supply Cube: 24VAC 500mA, available in US 120V, EU 230V, UK 230V or AUS/NZ 230V AC input.
**NOTE: AVAILABLE MORE INEXPENSIVELY THROUGH A DIFFERENT DISTRIBUTION CHANNEL**
**OTHER OPTIONS ALSO AVAILABLE ON THAT OTHER CHANNEL, INCLUDING BLACK FRONT PANEL, MONO SWITCH, AND UPGRADED JACKS.** (due to eBay policy, we are unable to link to it here, but, using traditional web search techniques, we are confident that you will locate it easily)
**PRICES HIGHER ON EBAY DUE TO EBAY FEES**