ShuGuang Treasure KT66-Z regular version a pair vacuum tube

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ONE-YEAR WARRANTY !!!

Description：
Beam power tetrode KT66, limit its anode dissipation power is 25W, for A1, AB1 audio amplifier , AB2 class amplification .
Hot wire heating
U H ............ 6.3V
I H ............ 1.27A

Recommended operating status ( reference value )
Push-pull Class A1 zoom ( self-bias )
Ua ........................ 390 250 V
Ug2 ..................... 275 250 V
-Ug1 ..................... 22.5 17.5 V
Rk (per tube) ...... 500 200 Ω
RL (a-a) ............... 8 4 kΩ
ü (g1-g1.pk) ......... 70 36 V
Ia (0) ............... 2 × 52 2 × 81 mA
Ia (max.sig) ...... 2 × 62.5 2 × 82.5 mA
Ig2 (0) ............... 2 × 2.5 2 × 6 mA
Pout ..................... 30 17 W
Dtot ..................... 6 4%

Driving AB1 zoom , ultra- linear connection fixed bias
Self-bias Ua ..................... 552 --- 450 V
Ug2 .................. 525 --- 425 V
-Ug1 .................. 67 --- 35 VRk (pcr tube) ... ----- 560 Ω
RL (a-a) ............ 8 ----- 7 kΩ
ü (g1-g1.pk) ...... 127 ---- V
Ia + g2 (0) ............ 2 × 35 - 2 × 62.5 mA
Ia + g2 (max.sig) ... 2 × 80 - 2 × 72.5 mA
Pout ..................... 50 32 W
Dtot ..................... 3 --- 2%
UH ........................... 6.3 V

Limit Ratings:Tetrode connection transistor connection
Anode voltage：500V 400 V
Anode dissipation power： 25W 、 25W
The second gate voltage： 400V
The second gate power dissipation：3.5W
Cathode Current ： 200mA
Between hot wire cathode voltage： ± 100 V

The first gate resistor
Fixed bias 0.1 MΩ
Since the bias voltage: 0.5 MΩ

Capacitances：
Tetrode connection transistor
The input capacitor： 16PF 8.7PF
Output capacitance ： 11.5PF 15.8 PF
Cross Road capacitance： 1.1PF 7.2-PF

Static parameters
Ua ................................. 250 V
Ug2 .............................. 250 V
-Ug1 .............................. 15 V
Ia ................................. 85 mA
Ig2 .............................. 6.3 mA
Gm .............................. 6.3 mA / V
ri ................................. 22.5 kΩ
RL ................................. 2.2 kΩ
Pout .............................. 7.25 W
Dtot .............................. 9.0%