While not inexpensive, these are by far the best tubes I've heard in my Leben amplifier. Like night and day from the Gold Lions I had. Deeper, richer sound, great soundstage. unbelievable. Best improvement in sound I've heard in a long time in my system. Thanks, Marc. Great product.
EAT KT88 Vacuum Tubes. Better than a KT88 Should Sound.
Now at True Audiophile.
WOW. Yes they had a massive price increase. A case of being recognized as the finest KT88 ever made.
They're in insanely short supply and very hard to produce, hence the new pricing. Nothing we can do.
Please inquire first to make sure we have them or can get them. Thanks for your understanding.
Price is for a Factory Match QUAD
We're pretty excited about these tubes. The plate structure reminds us of earlier and far better sounding KT88's...TA
The Absolute Sound is a believer. "If you believe upmarket tubes merely bring differences rather than improvements in sound, these Czech KT-88 tubes will make you think again...It took all of, oh, two seconds to justify their existence." Read the full review here.
Soundstage 2019 Fall is a believer: I began with the KT88 Diamonds in the VM60s, then replaced them with the Gold Lions, then swapped them in and out several more times, listening again after each swap. The results were the same as with Totem’s Tribe Towers: regardless of the recording played, the Gold Lions didn’t have the same propulsion in the bass and midrange, certainly didn’t sound as smooth through the midrange, and produced a loss of cleanness and air in the highs. The sound with the Genalexes wasn’t bad -- it just wasn’t nearly as good as with the EATs. As Ken said, it’s easy to justify their existence.
"Are they worth it?"
"Outwardly, EAT’s KT88 Diamond tube doesn’t look as if it should cost $448.75 (actually, $1795/four). Sonically, it’s a different story. Eight KT88 Diamonds considerably improved the sound of my JE Audio VM60 monoblocks. The JEAs didn’t become completely different-sounding amps, but they sure sounded better than before. What’s more, the level of improvement was far greater than any change of speaker cable, interconnect, or power cord I’ve ever tried. Still, was that improvement worth more than seven times the cost of my Gold Lions? In my opinion, it comes down to how in love you are with the sound of your tube amplification -- and if you have the money.
This 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.
- Valve Type: *KT88 DIAMOND*
- Size – included socket: 5.2 × 12.5 cm / 2 × 4.9 inch
- Plate dissipation (Max.): 40 W
- Grid dissipation (Max.) : 6 W
- Cooling: radiation
- Heater – Voltage: 6.3 V
- Heater – Current: 1.6 A
- 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)
These are presently on backorder. If you would like a set please email us and we will check status.
The Absolute Sound is a believer. "If you believe upmarket tubes merely bring differences rather than improvements in sound, these Czech KT-88 tubes will make you think again." Read the full review here.
- 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"