ShuGuang Treasure KT66-Z vacuum tube Collection Version

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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%