# Vacuum Tube - KT66, JJ Electronics

The JJ Electronic KT66 is a sonically faithful reproduction of the original tubes with a robust construction encased in a thick glass envelope. The JJ KT66 delivers a powerful 25 Watts with plenty of headroom. This tube has a tone that is warm, thick, and straightforward. With a more balanced sound than the 6L6GC, the JJ KT66 is an excellent choice for a full bodied tone.

Matched versions of this tube use Apex Matching

RoHS Compliant

Single or Matched | Our Part Number | UPC/EAN |
---|---|---|

Apex Matched Pair | T-KT66-JJ-MP | 609722123136 |

Apex Matched Quad | T-KT66-JJ-MQ | 609722123143 |

Single | T-KT66-JJ | 609722123129 |

Body Height | 110 mm | |

Cathode Current (I_{k}) | ≤ 150 mA | |

Filament Current (I_{f}) | 1.3 A | |

Filament Voltage (U_{f}) | 6.3 V | |

Grid 1 voltage (U_{g1}) | ≥ -200 V, -15 V typical | |

Grid 2 current (I_{g2}) | ≤ 7 mA | |

Grid 2 dissipation (W_{g2}) | 3.5 W | |

Grid 2 voltage (U_{g2}) | ≤ 550 V, 250 V typical | |

Grid capacitance (c_{g1}) | 16 pF | |

Grid to Plate Capacitance (c_{a/g}) | 2.3 pF | |

Internal Resistance (R_{i}) | 22.5 kΩ | |

Item Diameter | 52 mm | |

Item Height | 125 mm | |

Plate Capacitance (c_{a}) | 10 pF | |

Plate Current (I_{a}) | 85 mA | |

Plate Dissipation (W_{a}) | ≤ 25 W | |

Plate Voltage (U_{a}) | ≤ 550 V, 250 V typical | |

Transconductance (S) | 6 mA/V |

Packaging Dimensions | Apex Matched Pair version | T-KT66-JJ-MP | 5.3 in. × 4.5 in. × 2.3 in. |

Apex Matched Quad version | T-KT66-JJ-MQ | 5.3 in. × 4.5 in. × 4.5 in. | |

Single version | T-KT66-JJ | 2.3 in. × 2.3 in. × 5.3 in. | |

Weight (Packaging) | Apex Matched Pair version | T-KT66-JJ-MP | 0.512 lbs. |

Apex Matched Quad version | T-KT66-JJ-MQ | 1.024 lbs. | |

Single version | T-KT66-JJ | 0.256 lbs. |

T-KT66-JJ-MP - Apex Matched Pair version | Body Height | 110 mm |

Cathode Current (I_{k}) | ≤ 150 mA | |

Filament Current (I_{f}) | 1.3 A | |

Filament Voltage (U_{f}) | 6.3 V | |

Grid 1 voltage (U_{g1}) | ≥ -200 V, -15 V typical | |

Grid 2 current (I_{g2}) | ≤ 7 mA | |

Grid 2 dissipation (W_{g2}) | 3.5 W | |

Grid 2 voltage (U_{g2}) | ≤ 550 V, 250 V typical | |

Grid capacitance (c_{g1}) | 16 pF | |

Grid to Plate Capacitance (c_{a/g}) | 2.3 pF | |

Internal Resistance (R_{i}) | 22.5 kΩ | |

Item Diameter | 52 mm | |

Item Height | 125 mm | |

Plate Capacitance (c_{a}) | 10 pF | |

Plate Current (I_{a}) | 85 mA | |

Plate Dissipation (W_{a}) | ≤ 25 W | |

Plate Voltage (U_{a}) | ≤ 550 V, 250 V typical | |

Transconductance (S) | 6 mA/V | |

T-KT66-JJ-MQ - Apex Matched Quad version | Body Height | 110 mm |

Cathode Current (I_{k}) | ≤ 150 mA | |

Filament Current (I_{f}) | 1.3 A | |

Filament Voltage (U_{f}) | 6.3 V | |

Grid 1 voltage (U_{g1}) | ≥ -200 V, -15 V typical | |

Grid 2 current (I_{g2}) | ≤ 7 mA | |

Grid 2 dissipation (W_{g2}) | 3.5 W | |

Grid 2 voltage (U_{g2}) | ≤ 550 V, 250 V typical | |

Grid capacitance (c_{g1}) | 16 pF | |

Grid to Plate Capacitance (c_{a/g}) | 2.3 pF | |

Internal Resistance (R_{i}) | 22.5 kΩ | |

Item Diameter | 52 mm | |

Item Height | 125 mm | |

Plate Capacitance (c_{a}) | 10 pF | |

Plate Current (I_{a}) | 85 mA | |

Plate Dissipation (W_{a}) | ≤ 25 W | |

Plate Voltage (U_{a}) | ≤ 550 V, 250 V typical | |

Transconductance (S) | 6 mA/V | |

T-KT66-JJ - Single version | Body Height | 110 mm |

Cathode Current (I_{k}) | ≤ 150 mA | |

Filament Current (I_{f}) | 1.3 A | |

Filament Voltage (U_{f}) | 6.3 V | |

Grid 1 voltage (U_{g1}) | ≥ -200 V, -15 V typical | |

Grid 2 current (I_{g2}) | ≤ 7 mA | |

Grid 2 dissipation (W_{g2}) | 3.5 W | |

Grid 2 voltage (U_{g2}) | ≤ 550 V, 250 V typical | |

Grid capacitance (c_{g1}) | 16 pF | |

Grid to Plate Capacitance (c_{a/g}) | 2.3 pF | |

Internal Resistance (R_{i}) | 22.5 kΩ | |

Item Diameter | 52 mm | |

Item Height | 125 mm | |

Plate Capacitance (c_{a}) | 10 pF | |

Plate Current (I_{a}) | 85 mA | |

Plate Dissipation (W_{a}) | ≤ 25 W | |

Plate Voltage (U_{a}) | ≤ 550 V, 250 V typical | |

Transconductance (S) | 6 mA/V |

Specification Sheet | All Models |

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