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Elekit TU-8500DX 12AU7 Pre-Amplifier Kit

  • 52500



Description

The TU-8500 is an exceptionally well designed pre-amplifier kit including phono stage. This is a special edition exclusively for the diyAudio store that includes 5% AMTRANS carbon 1/4 W resistors. 

The front features a power switch, volume control and 4 way input selector (Line 1/2/3/Phono).

The rear features a pair of RCAs for each input of Line 1, 2, 3 and  Phono, and pre-out. There's also a 3.5mm jack bound to Line 3. Switches are offered for MC/MM cartridge selection and a unity gain toggle switch for use with sources that already have enough gain.

It's a perfect match for the TU-8200 power amplifier.

Phono stage features:

  • Precision RIAA equalization (CR not NF)
  • Supports both MM and MC cartridges
  • Low noise Opamps using sockets to allow for the easy substitution of alternative Opamps

Line stage features:

  • Two 12AU7 (ECC82) tubes
  • Switchable unity gain or 3x gain
  • Reduced hum/background noise circuitry
  • Low flux leakage R-core transformer
  • FET ripple filter for B-power
  • Tubes powered by the DC power supply

Other features

  • DIY friendly PCB with room for larger coupling capacitors
  • 100/115/220/230V input voltage selectable during assembly

 

    Reviews:

    Tools required

    • Phillips screwdriver
    • Diagonal cutter
    • Longnose pliers
    • Scissors
    • Scotch tape
    • Hex wrench
    • Soldering iron

    Specifications

    • Stock tube: 2 x 12AU7 (ECC82)
    • Opamp: 2 x NJM2068DD
    • Dimensions: 252 x 73 x 270mm including projections
    • Weight: ~3.1kg assembled
    • Line stage
      • Gain: x3.1 (9.8dB) / x1.15 (1.2dB) selectable
      • Frequency Response: 2Hz-70kHz / 2Hz - 280kHz (-3 dB)
      • SN ratio (IHF-A): 122dB / 129dB
      • Max Output Voltage: 22V rms (1kHz)
    • Phono equalizer stage
      • RIAA equalization: +/- 0.5dB tolerance (20Hz - 280kHz)
      • Cartridge: MM / MC selectable
      • Gain (1kHz): MM 37dB / MC 63dB
      • SN ratio (IHF-A): MM 108dB / MC 88dB
      • Input resistance: MM 50kΩ / MC 100Ω
      • Max output voltage: 7.4V rms (1kHz)
    • Audio Inputs
      • Phono (2 x RCA)
      • Line 1 (2 x RCA)
      • Line 2 (2 x RCA)
      • Line 3 (2 x RCA or 3.5mm jack)
    • Audio Outputs
      • Pre-Out (2 x RCA)
    • Input Power: 110/115/200/230V via IEC inlet
    • Included tubes: NOS GE 5965

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