Inputs:

  • Line: 3 selectable at front panel, plus phono select
  • Phono: MC and MM, selectable at rear panel. Optional dual MC also possible.
    • MC configurable at factory for +9/+15dB step up.
    • MM switch at rear panel to select load of 1K / 47K / 100K

Outputs:

  • Standard professional +4dB compatible (Main 1)
  • Consumer Level -10db compatible (Main 2)
  • Record Out for Phono or pass through for Line
  • Max undistorted output: approximately +14dB
  • Max input level: approx. 8VRMS (22Vp-p) or +20dBm

Phono Section:

  • Passive RIAA with hand selected components. 18Hz to 25KHz +/- 1 dB
  • +40 dB gain MM; +49dB / +55dB MC depending on step-up configuration, to Record-Out out jacks. Total system gain possible: +64dB MM, +78dB MM.
  • One 12AX7 tube per channel for RIAA filter and input boost.
  • One 12AU7 tube, single section, for post RIAA boost.
  • Hum and Noise: approximately 85db down, depending on tubes and other parameters like cable configuration, power supply placement, etc.

Line Section:

  • One 5687 tube per channel –choke loaded with Coffman Labs custom choke.
  • Approximately 24 dB maximum possible gain, input volume control padded
  • Up to +14 dB output possible without distortion
  • Hum and Noise: not audible at full gain if setup properly.
  • Dual lines outputs, Standard and Low (-4.5 dB – or user customizable)

Power Supply:

  • One 5AR4 tube into double PI filter choke input design. No solid state regulation.
  • 100-240V capable: Specified at build time.
  • Separate chassis with 55” umbilical cable.
  • Maximum separation (18” or more) is always recommended.

Parts and Components:

  • Vintage Oil in Paper capacitors (OIP) for all audio paths
  • Military Spec Switch for input.
  • Cryo-treated wire throughout.

Chassis:

  • Handmade by local machinist.
  • Artisan chassis available: Call for information
  • Separate Power Supply and Amplifier: 55” umbilical
  • Power Supply size: Approximately 6.25” Wide X 12” Deep X 5.5” High
  • Amplifier Size: Approximately 9.25” Wide X 13” Deep X 8” High (with tubes)

Frequency & Distortion Response: (approximate—will vary with tubes)

  • Line Section:
    • Flat 20Hz to 40KHz
    • -1 dB at 10Hz and 100Khz
    • 2nd Harmonic = -40dB at +10 dBu output (2.8V RMS)
    • 2nd Harmonic = –45dB at +4 dBu output (1.23V RMS)
    • 2nd Harmonic un-measurable at -8 dBu output which is greater than typical maximum required to drive power amplifier to maximum volume. (Note this allows you to tune the listening experience by selecting the #1 or #2 main output—the #2 output will give you a slightly warmer sound.)
  • Bass Boost: Bass volume set to maximum for all specifications below.
    Frequency selected at three points: Minimum, Center, and Maximum
    Note that most of the sensitivity for frequency is in lower half of potentiometer range, where most of your tuning for speakers will be(15Hz to 25Hz).

    • Bass Frequency set to minimum (15Hz)
      • Gain at 20Hz = +6.5dB
      • Gain at 50Hz = +5dB
      • Gain at 100Hz = +2 dB
    • Bass Frequency set to mid-point (25Hz)
      • Gain at 20Hz = +7dB
      • Gain at 50Hz = +5.5dB
      • Gain at 100Hz = +2.5 dB
    • Bass Frequency set to maximum (75Hz)
      • Gain at 20Hz = +9.5dB
      • Gain at 50Hz = +11 dB
      • Gain at 100Hz = +8 dB
    • Recommended starting point is bass frequency set to minimum, and bass volume set to 9 AM.
  • RIAA Section:
    • Better than +/- 0.1dB accuracy 100Hz to 50KHz
    • -0.5db at 40Hz; – 0.8 dB at 30Hz
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