**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**