MADE IN JAPAN

ELEKIT TU-8800

PENTODE SINGLE-ENDED TUBE AMP DIY KIT

HIGH QUALITY DIY (DO-IT-YOURSELF) KIT

ELEKIT TU-8800

PENTODE SINGLE-ENDED TUBE AMP

The TU-8800 is a single-ended power amp kit that supports many popular octal-base pentode and beam power tubes. By simply changing the power mode, 6V6, 6L6/EL34 and most of the KT series tubes can be used. The TU-8800 is the culmination of ELEKIT's best designs and circuitry from their previous amp models.

  • Support various pentode and beam tubes
    Select from three power modes with the switch on the top of the chassis. The amp supports various commercially available pentode and beam tubes. An ELEKIT feature - select Triode or Ultralinear modes by a switch on the top of the amp chassis.

  • Active Automatic bias adjustment system
    The ELEKIT original "Active automatic bias adjustment system" is used. Depending on selected power mode and tube type, correct level of bias current is set. The accuracy and stability of this feature has been improved from past models.

  • Stable NFB circuit for great audio quality
    The NFB loop is separated to the output stage and voltage amplification stage for maximum amp stability. Especially for the output stage, cathode NFB is applied from the third winding of the OPT. This circuitry minimizes NFB and the amp achieves high stability without adjustment.

  • Ample space for larger coupling caps
    Capacitors play an important role in sound quality. For TU-8800, conductive polymer hybrid electrolytic capacitors and PP film capacitors are used. Although they are small in size, the PP film caps are of very high performance. For those who wish to use other even higher quality caps, there is ample space provided on the PCB for mounting larger caps.

  • Selectable output levels for headphones
    From low to high impedances, the headphone output level can be selected from 6 levels by simply changing the jumper location.

  • DAC Kit
    Our USB-DAC kit (PS-3249R) can be built-in.

TU-8800 with KT88 tubes installed

TU-8800 with KT150 tubes installed

TUBES

Comes with ECC81 (12AT7) and KT88 tubes. Works with 18 other power tube models !

WORKING MODES

Two switchable power amp working modes - Triode or Ultralinear

ACTIVE BIAS

Original ELEKIT Active automatic bias adjustment system

HEADPHONES

Six jumper selectable headphones output levels for best impedance matching

TU-8800 Connections

TECHNICAL SPECIFICATION
STOCK TUBES JJ Electronic KT88 x 2 + ECC81 (12AT7) x 2
CIRCUIT CONFIGURATIONS Output stage
A-class, single, active automatic bias, power mode SW, connection mode selectable from TRIODE and UL.
Heater power
Voltage amplification tube : DC-power, Output tube : AC-power
B-power
MOSFET ripple filter (Right and left channel independently)
MAX. OUTPUT KT88, 8Ω load, THD 10%
HIGH, UL: 2 x 12,5 W
MID, UL: 2 x 6,8 W
LOW, UL: 2 x 4,5 W
HIGH, TRIODE: 2 x 7,2 W
RATED INPUT 360 mV RMS (KT88, HIGH, UL)
FREQUENCY RESPONSE 12 - 55000 Hz (-3 dB)
RESIDUAL NOISE 90 µV RMS (IHF-A, 8Ω load)
INPUT TERMINAL RCA jack, stereo 2 lines (INPUT 1, INPUT 2)
3-pole mini (∅ 3,5mm) jack 1 line (INPUT 2 has a priority)
OUTPUT TERMINAL Binding terminal (gold-plated, banana plug compatible)
Headphone output : 3-pole standard (∅ 6.3mm) jack
SPEAKER IMPEDANCE 4 to 16 Ω
HEADPHONE IMPEDANCE 8 to 600 Ω unbalanced
POWER VOLTAGE AC 115V or 230V 50/60Hz (selected upon assembly)
IEC standard 3P inlet type
RATED POWER CONSUMPTION 95 W
DIMENSIONS W 350 mm x H 204 mm x D 324 mm (inc. projections)
WEIGHT Approx. 12 kg (assembled, inc. tubes, exc. power cord)

DIY - DO IT YOURSELF

Please remember that this is a DIY kit. It means that YOU will have to build it yourself using assembly manual. The kit includes all electronic and mechanical parts (including tubes and housing) required to build a ready to work, high quality tube preamplifier. It should take 4-5 hours to construct and it will need soldering. You should have some tools and soldering skills. There is not included interconnects and the power cable is Japanese type, you will need a proper cable for your country.

TOOLS REQUIRED

Although building this kit is not hard, you will need some skills and tools. A multimeter is not required but can be useful.

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

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