EAT - Exceptional Audio Tubes - KT88 Diamond Vacuum Tube- Matched Quad Box Set

EAT

A KT88 tube that is in a league of its own. This KT88 tube is available in factory-matched quartets. It's construction features include black plates, black metal base, and gold pins.


The E.A.T. KT88 has a designed maximum anode dissipation rating of 35W and is recommended for use in the output stage of an a.f. amplifier. Two valves in class AB1 give a continuous output of up to 100W. The KT88 is also suitable for use as a series valve in a stabilized power supply. The EAT KT88 is one of the best KT88 tubes in production. For a KT88 review

  • Valve Type: *KT88 DIAMOND*
  • Size – included socket: 5.2 × 12.5 cm / 2 × 4.9 inch

Characteristics:

  • Plate dissipation (Max.): 40 W
  • Grid dissipation (Max.) : 6 W
  • Cooling: radiation
  • Heater – Voltage: 6.3 V
  • Heater – Current: 1.6 A

Maximum ratings:

  • Anode voltage: 800 V
  • Screen grid voltage: 600 V
  • Va, g2: 600 V
  • - Vgl: 200 V
  • Pa: 35 W
  • Pg2: 6 W
  • Pa + g2: 40 W
  • Ik: 230 mA
  • Vh -k: 200 V
  • Tbulb: 250 °C

Capacitances (measured on a cold unscreened valve)

  • Triode connection
    • Cgl -a, g2: 7.9 pF
    • Cg1 -all less a, g2: 9.8 pF
    • Ca, g2 -all less g1: 17 pF
  • Tetrode connection
    • Cg 1 -a: 1.3 pF
    • Cg 1 -all less a: 17 pF
    • Ca -all less g1: 12 pF

Push – Pull, Class AB 1, Cathode Bias, Ultra-Linear Connection (40% Tapping Points).

  • Vag2 (b): 500 – 375 V
  • Vag2 (o): 436 – 328 V
  • Ia + g2 (o): 2 × 87 – 2 × 87 mA
  • Ia + g2 (max. sig): 2 × 99 – 2 × 96 mA
  • RL (a-a): 6 – 5 k Ohms
  • Rk*2 × 600 – 2 × 400 Ohms
  • - Vg1 (approx.): 52 – 35 V
  • Pout : 50 – 30 W
  • Dtot: 1,5 – 1 %
  • I.M.D. : 4 – 3 %
  • Wa + g2 (o): 2 × 38 – 2 × 28.5 W
  • Wa + g2 (max. sin): 2 × 17 – 2 × 16 W
  • V g1 – g1 ac: 104 – 71 V
  • Zout: 4.8 – 4.5 k Ohms*

*It is essential to use two separate cathode bias resistors. I.M.D. intermodulation distortion measured using two input signals at 50 and 6000 Hz (ratio of amplitudes 4:1)

Push – Pull, Class AB 1, Cathode Bias, Triode connection.

  • Vag2 (b): 400 – 485 V
  • Vag2 (o): 349 – 422 V
  • Ia + g2 (o): 2 × 76 – 2 × 94 mA
  • Ia + g2 (max. sig): 2 × 80 – 2 × 201 mA
  • RL (a – a): 4 – 4 k Ohms
  • -Vg1 (approx.): 40 – 50 V
  • Pout: 17 – 31 W
  • Dout: 1.5 – 1.5 %
  • I.M.D.: 5.6 – 5.6 %
  • Wa + g2 (o): 2 × 26.5 – 2 × 40 W
  • Wa + g2 (max. sin): 2 × 29 – 2 × 27 W
  • V g1 – g1 ac: 78 – 114 V
  • Rk: 2 × 525 – 2 × 525 Ohms
  • Zout: 4.8 – 4.5 k Ohms

I.M.D. intermodulation distortion measured using two input signals at 50 and 6000 Hz (ration of amplitudes 4:1).

Sold as a Matched Quad Box Set (4x KT88 Tubes)

Coming Soon!
  • Input impedance MC: 10,30,50,90,100,1000,47K Ohm
  • Output impedance: 100 ohms
  • Load capacity: 50,150,270,370,520,620,740 pF
  • Gain MM: 45 dB
  • Gain MC :45,50,55,65,70 dB
  • RIAA accuracy within 0,5dB/20Hz – 20kHz
  • Subsonic: 18 dB / Octave
  • Input: RCA
  • Output: RCA
  • Power supply: DC18V/1
  • Dimensions W × H × D 17.1" × 3.5" × 10.6"