# Vacuum Tube - 2A3, JJ Electronics

The JJ Electronic 2A3 features a robust construction in a beautiful thick glass envelope. The JJ 2A3 offers 40 Watts of plate dissipation which far surpasses the headroom of other 2A3 tubes by 25 Watts. The single plate build and increased ratings give this tube the highest reliability. The JJ 2A3 has amazing detail and clarity with excellent separation.

RoHS Compliant

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

Matched Pair | T-2A3-40-JJ-MP | 609722122733 | |

Matched Quad | T-2A3-40-JJ-MQ | 609722122740 | |

Single | T-2A3-40-JJ | 609722122726 | 2A3-40 |

Body Height | 150 mm | |

Filament Current (I_{f}) | 2.5 A | |

Filament Voltage (U_{f}) | 2.5 V | |

Gain (μ) | 4.2 | |

Grid Voltage (U_{g}) | -45 V typical | |

Grid capacitance (c_{g1}) | 17 pF | |

Grid to Plate Capacitance (c_{a/g}) | 7.5 pF | |

Internal Resistance (R_{i}) | 800 Ω | |

Item Diameter | 63 mm | |

Item Height | 165 mm | |

Plate Capacitance (c_{a}) | 11 pF | |

Plate Current (I_{a}) | 60 mA | |

Plate Dissipation (W_{a}) | ≤ 40 W | |

Plate Voltage (U_{a}) | ≤ 450 V, 250 V typical | |

Transconductance (S) | 5.25 mA/V |

Packaging Dimensions | Matched Pair version | T-2A3-40-JJ-MP | 7.4 in. × 6.9 in. × 3.5 in. |

Matched Quad version | T-2A3-40-JJ-MQ | 7.4 in. × 6.9 in. × 6.9 in. | |

Single version | T-2A3-40-JJ | 3.5 in. × 3.8 in. × 7.3 in. | |

Weight (Packaging) | Matched Pair version | T-2A3-40-JJ-MP | 0.89 lbs. |

Matched Quad version | T-2A3-40-JJ-MQ | 1.78 lbs. | |

Single version | T-2A3-40-JJ | 0.445 lbs. |

T-2A3-40-JJ-MQ - Matched Quad version | Body Height | 150 mm |

Filament Current (I_{f}) | 2.5 A | |

Filament Voltage (U_{f}) | 2.5 V | |

Gain (μ) | 4.2 | |

Grid Voltage (U_{g}) | -45 V typical | |

Grid capacitance (c_{g1}) | 17 pF | |

Grid to Plate Capacitance (c_{a/g}) | 7.5 pF | |

Internal Resistance (R_{i}) | 800 Ω | |

Item Diameter | 63 mm | |

Item Height | 165 mm | |

Plate Capacitance (c_{a}) | 11 pF | |

Plate Current (I_{a}) | 60 mA | |

Plate Dissipation (W_{a}) | ≤ 40 W | |

Plate Voltage (U_{a}) | ≤ 450 V, 250 V typical | |

Transconductance (S) | 5.25 mA/V | |

T-2A3-40-JJ-MP - Matched Pair version | Body Height | 150 mm |

Filament Current (I_{f}) | 2.5 A | |

Filament Voltage (U_{f}) | 2.5 V | |

Gain (μ) | 4.2 | |

Grid Voltage (U_{g}) | -45 V typical | |

Grid capacitance (c_{g1}) | 17 pF | |

Grid to Plate Capacitance (c_{a/g}) | 7.5 pF | |

Internal Resistance (R_{i}) | 800 Ω | |

Item Diameter | 63 mm | |

Item Height | 165 mm | |

Plate Capacitance (c_{a}) | 11 pF | |

Plate Current (I_{a}) | 60 mA | |

Plate Dissipation (W_{a}) | ≤ 40 W | |

Plate Voltage (U_{a}) | ≤ 450 V, 250 V typical | |

Transconductance (S) | 5.25 mA/V | |

T-2A3-40-JJ - Single version | Body Height | 150 mm |

Filament Current (I_{f}) | 2.5 A | |

Filament Voltage (U_{f}) | 2.5 V | |

Gain (μ) | 4.2 | |

Grid Voltage (U_{g}) | -45 V typical | |

Grid capacitance (c_{g1}) | 17 pF | |

Grid to Plate Capacitance (c_{a/g}) | 7.5 pF | |

Internal Resistance (R_{i}) | 800 Ω | |

Item Diameter | 63 mm | |

Item Height | 165 mm | |

Plate Capacitance (c_{a}) | 11 pF | |

Plate Current (I_{a}) | 60 mA | |

Plate Dissipation (W_{a}) | ≤ 40 W | |

Plate Voltage (U_{a}) | ≤ 450 V, 250 V typical | |

Transconductance (S) | 5.25 mA/V |

Specification Sheet | All Models |

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## Specifications, Files, and Documents

## Questions and Answers

Click each question to see its answers.

1 answers
Will these JJ 2A3 40 WATT tubes be suitable for a SET DHT (3 W) amp?

Asked by

*Anonymous*on March 17th, 2019.
If your amp calls for 2A3 tubes, these will work.

## Product Reviews

Lives up to its reputation. Easily trumps my other 2A3 tubes' sound and power. Took my 2A3 SET amp from mmmmm-good to ahhhh-superb!