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Elekit TU-8600E 300B Power Amplifier / Headphone Amplifier Kit

  • 1,23000

This is a pre-order. Shipping estimate is December 15th 2018. Please see our pre-order information page for more information about how diyAudio Store pre-orders work.


>>> Please note that tubes are not included in this kit <<<

>>> Stock clearance! Now on sale for $1099, regular price $1230 <<<

The TU-8600E is a 300B single ended audio power amplifier kit.

This is a special edition for the diyAudio store that includes 2% REX50G Takman resistors.


    Power circuit enhancement

    • High efficiency, low magnetic flux leakage R-core transformer
    • Schottky barrier diodes for shorter recovery time
    • Individual windings for the filament heater (A power), high voltage (B power), and bias to stabilize the negative feedback circuitry (C power)
    • All power stabilized to reduce residual noise as much as possible, resulting in a noise level as low as 1/10th of the TU-8300R

    Stable NFB circuit for high quality audio

    • Improvement to various parts and circuits including OPT to make the most of 300B tubes
    • NFB applied to cathode of 300B by the third winding of the OPT as well as to the voltage amplifying stage
    • NFB is minimized as well as transient response

    New active automatic bias adjustment

    • Bias power is supplied separately
    • New "Active automatic bias" used where the amp detects plate current and automatically adjusts the grid voltage, rendering the TU-8600 both self-biasing as well as having fixed bias.
    • Current detecting circuit moved from cathode side to the B power side for better sound quality

    Full power use of 300B tubes

    • Orthodox voltage amplification stage to make the most of the 300B's outstanding sonic characteristics
    • 12AU7 (ECC82) used in parallel for 2nd stage to drive the 300B tubes to full power resulting in 200Vp-p without clipping

    Tube friendly design

    • Warm up times for directly heated and indirectly heated tubes differ. Most designs warm up both at the same rate.
    • The TU-8600 heats up the directly heated 300B tubes after the indirectly heated 12AU7 / 12AX7 indirectly heated tubes have warmed up. 
    • This is a very tube friendly design that will not overload tubes that have not warmed up fully 

    Output level section for headphones

    • There are jumpers on the board to allow for headphone impedance matching

      DIY friendly design

      • The TU-8600 comes with high quality polymer hybrid electrolytic caps and polypropylene film caps, however extra space has been designed into the PCB for audiophiles to add (larger) after market caps


      • The TU-8600 operates at very high voltages, and includes a safety cover


      • Tubes: 300B x 2, 12AX7x1, 12AU7x2 (TUBES ARE NOT INCLUDED)
      • Rated output: 9.2W + 9.2W (10% THD)
      • Rated input: 320mV
      • Residual noise: 36uV (IHF-A)
      • Frequency response: 7Hz-40kHz (-3dB)
      • Input impedance: 50kΩ
      • Output impedance: 4-6.3Ω, 8-16Ω selectable
      • Input: Line1 (2 x RCA)
      • Output: Gold plated speaker output terminals (banana plug compatible)
      • Power input: 100/115/200/230V 50/60Hz (IEC inlet)
      • Power Consumption: 90W
      • Dimensions: 385x217x325mm (including projections)
      • Weight: ~12.6kg assembled

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