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 (If) | 2.5 A | ||
| Filament Voltage (Uf) | 2.5 V | ||
| Gain (μ) | 4.2 | ||
| Grid Voltage (Ug) | -45 V typical | ||
| Grid capacitance (cg1) | 17 pF | ||
| Grid to Plate Capacitance (ca/g) | 7.5 pF | ||
| Internal Resistance (Ri) | 800 Ω | ||
| Item Diameter | 63 mm | ||
| Item Height | 165 mm | ||
| Plate Capacitance (ca) | 11 pF | ||
| Plate Current (Ia) | 60 mA | ||
| Plate Dissipation (Wa) | ≤ 40 W | ||
| Plate Voltage (Ua) | ≤ 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 | 0.8466 lbs. |
| Matched Quad version | T-2A3-40-JJ-MQ | 1.6932 lbs. | |
| Single version | T-2A3-40-JJ | 0.4233 lbs. |
| T-2A3-40-JJ-MQ - Matched Quad version | Body Height | 150 mm |
| Filament Current (If) | 2.5 A | |
| Filament Voltage (Uf) | 2.5 V | |
| Gain (μ) | 4.2 | |
| Grid Voltage (Ug) | -45 V typical | |
| Grid capacitance (cg1) | 17 pF | |
| Grid to Plate Capacitance (ca/g) | 7.5 pF | |
| Internal Resistance (Ri) | 800 Ω | |
| Item Diameter | 63 mm | |
| Item Height | 165 mm | |
| Plate Capacitance (ca) | 11 pF | |
| Plate Current (Ia) | 60 mA | |
| Plate Dissipation (Wa) | ≤ 40 W | |
| Plate Voltage (Ua) | ≤ 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 (If) | 2.5 A | |
| Filament Voltage (Uf) | 2.5 V | |
| Gain (μ) | 4.2 | |
| Grid Voltage (Ug) | -45 V typical | |
| Grid capacitance (cg1) | 17 pF | |
| Grid to Plate Capacitance (ca/g) | 7.5 pF | |
| Internal Resistance (Ri) | 800 Ω | |
| Item Diameter | 63 mm | |
| Item Height | 165 mm | |
| Plate Capacitance (ca) | 11 pF | |
| Plate Current (Ia) | 60 mA | |
| Plate Dissipation (Wa) | ≤ 40 W | |
| Plate Voltage (Ua) | ≤ 450 V, 250 V typical | |
| Transconductance (S) | 5.25 mA/V | |
| T-2A3-40-JJ - Single version | Body Height | 150 mm |
| Filament Current (If) | 2.5 A | |
| Filament Voltage (Uf) | 2.5 V | |
| Gain (μ) | 4.2 | |
| Grid Voltage (Ug) | -45 V typical | |
| Grid capacitance (cg1) | 17 pF | |
| Grid to Plate Capacitance (ca/g) | 7.5 pF | |
| Internal Resistance (Ri) | 800 Ω | |
| Item Diameter | 63 mm | |
| Item Height | 165 mm | |
| Plate Capacitance (ca) | 11 pF | |
| Plate Current (Ia) | 60 mA | |
| Plate Dissipation (Wa) | ≤ 40 W | |
| Plate Voltage (Ua) | ≤ 450 V, 250 V typical | |
| Transconductance (S) | 5.25 mA/V |
 Specification Sheet | All Models |
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Questions? Contact us at [email protected], or give us a call at 480-820-5411
Product Reviews
These are the absolute best 2A3 tubes and made to take higher voltages. They share plate size with the 300B.
My B+ voltage is 345v , 56 ma. and I'm seeing 4w RMS.
They run cool and sound fantastic with pleanty of low end bass . They are also very fast ,best pace, rythum and timing than any mono blocks I've ever owned.
These tubes could take 450v so at 345v they should last for years too.
These 2A3-40 tubes do not have the upper midrange glare / that bark,honk in your face peak. They are very linear and offer a big open sound stage , they have more attack and decay . Music has pace ,rhythm and timing and a full bodied sence of presence, never sounding thin.
They have a large generously over sized single directly heated cathode.
Everything about these tubes are just extra including their physical size.
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!