Vacuum Tube - 5881WXT, Sovtek
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Starting at: $41.70
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The Sovtek 5881WXT is the same as the 5881 but with a full size base for easy installation in vintage amp designs. The Sovtek 5881 delivers a warm, round tone that "sweetens" any vintage or modern guitar amp design.
Built to rigid military standards, the 5881 will tolerate higher voltages than any other 6L6. In fact, they're frequently used as replacements for the old 7027 model in vintage Ampegs. Extremely consistent from piece to piece.
The Sovtek 5881 has a heater voltage of 6.3 volts at 0.88 amperes.
Matched versions of this tube use Apex Matching
RoHS Compliant
Accessory Items:
| Single or Matched | Our Part Number | UPC/EAN |
|---|---|---|
| Apex Matched Pair | T-5881WXT-SV-MP | 609722124041 |
| Apex Matched Quad | T-5881WXT-SV-MQ | 609722124058 |
| Single | T-5881WXT-SOVT | 683274021324 |
| Capacitance, Cathode to Heater | 11 pF | |
| Capacitance, Transfer | 1.0 pF | |
| Capacitance, input | 11 pF | |
| Capacitance, output | 6.7 pF | |
| Cathode to Heater Insulation Resistance | 4 MΩ | |
| Filament Current (If) | 840 - 920 mA | |
| Grid 1 Insulation Resistance | 200 MΩ | |
| Grid 1 Inverse Current | 0.5 mA | |
| Grid 2 Current | 6 mA | |
| Height, base to top | 3.5 in. | |
| Internal Resistance (Ri) | 18 kΩ - 75 kΩ | |
| Non-linear Harmonic Distortion | 15 % | |
| Output Power (POut) | 5.8 W | |
| Plate Current (Ia) | 60 mA - 86 mA | |
| Readiness Time | 50 s | |
| Transconductance (S) | 5.2 mA/V - 6.8 mA/V |
| Packaging Dimensions | Apex Matched Pair version | T-5881WXT-SV-MP | 5.1 in. × 3.5 in. × 1.8 in. |
| Apex Matched Quad version | T-5881WXT-SV-MQ | 5.1 in. × 3.5 in. × 3.5 in. | |
| Single version | T-5881WXT-SOVT | 1.5 in. × 1.5 in. × 4 in. | |
| Weight (Packaging) | Apex Matched Pair version | T-5881WXT-SV-MP | 0.266 lbs. |
| Apex Matched Quad version | T-5881WXT-SV-MQ | 0.532 lbs. | |
| Single version | T-5881WXT-SOVT | 0.133 lbs. |
| T-5881WXT-SOVT - Single version | Capacitance, Cathode to Heater | 11 pF |
| Capacitance, Transfer | 1.0 pF | |
| Capacitance, input | 11 pF | |
| Capacitance, output | 6.7 pF | |
| Cathode to Heater Insulation Resistance | 4 MΩ | |
| Filament Current (If) | 840 - 920 mA | |
| Grid 1 Insulation Resistance | 200 MΩ | |
| Grid 1 Inverse Current | 0.5 mA | |
| Grid 2 Current | 6 mA | |
| Height, base to top | 3.5 in. | |
| Internal Resistance (Ri) | 18 kΩ - 75 kΩ | |
| Non-linear Harmonic Distortion | 15 % | |
| Output Power (POut) | 5.8 W | |
| Plate Current (Ia) | 60 mA - 86 mA | |
| Readiness Time | 50 s | |
| Transconductance (S) | 5.2 mA/V - 6.8 mA/V | |
| T-5881WXT-SV-MP - Apex Matched Pair version | Capacitance, Cathode to Heater | 11 pF |
| Capacitance, Transfer | 1.0 pF | |
| Capacitance, input | 11 pF | |
| Capacitance, output | 6.7 pF | |
| Cathode to Heater Insulation Resistance | 4 MΩ | |
| Filament Current (If) | 840 - 920 mA | |
| Grid 1 Insulation Resistance | 200 MΩ | |
| Grid 1 Inverse Current | 0.5 mA | |
| Grid 2 Current | 6 mA | |
| Height, base to top | 3.5 in. | |
| Internal Resistance (Ri) | 18 kΩ - 75 kΩ | |
| Non-linear Harmonic Distortion | 15 % | |
| Output Power (POut) | 5.8 W | |
| Plate Current (Ia) | 60 mA - 86 mA | |
| Readiness Time | 50 s | |
| Transconductance (S) | 5.2 mA/V - 6.8 mA/V | |
| T-5881WXT-SV-MQ - Apex Matched Quad version | Capacitance, Cathode to Heater | 11 pF |
| Capacitance, Transfer | 1.0 pF | |
| Capacitance, input | 11 pF | |
| Capacitance, output | 6.7 pF | |
| Cathode to Heater Insulation Resistance | 4 MΩ | |
| Filament Current (If) | 840 - 920 mA | |
| Grid 1 Insulation Resistance | 200 MΩ | |
| Grid 1 Inverse Current | 0.5 mA | |
| Grid 2 Current | 6 mA | |
| Height, base to top | 3.5 in. | |
| Internal Resistance (Ri) | 18 kΩ - 75 kΩ | |
| Non-linear Harmonic Distortion | 15 % | |
| Output Power (POut) | 5.8 W | |
| Plate Current (Ia) | 60 mA - 86 mA | |
| Readiness Time | 50 s | |
| Transconductance (S) | 5.2 mA/V - 6.8 mA/V |
 Specification Sheet | All Models |
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Questions and Answers
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1 answers
In the description, it says "Built to rigid military standards, the 5881 will tolerate higher voltages than any other 6L6." Then later, it says "max plate voltage is 250V. Other 6l6s are rated for 500 plate volts. This doesn't make any sense. Please explain. Thank you.
Asked by Anonymous on November 23rd, 2016.
November 23rd, 2016
Staff Member
Hello, this tube is 500 volts.
1 answers
Hi, which one is the best for a jcm900 100 w dual reverb 2000 year made, this one or the Sovtek 6L6WXT+? what is the diference?
or another brand and number.
Thanks
Asked by Anonymous on October 2nd, 2021.
October 4th, 2021
Staff Member
Tube tone is subjective and our 6L6 comparison chart should help you determine what choice is best for you and your playing. https://www.amplifiedparts.com/tech-articles/6l6gc-comparison-current-made-tubes
Substitute Products
The following items can be substituted for this product. While not necessarily exactly the same, they will function as replacement items in your project.
Product Reviews
Perfectly matched pair. Excellent performance.
Rugged tube. Able to withstand v4 plate voltage. But made for russian military. We don't buy Russian tubes anymore.
My tubes were in perfect working order. Packaged well and reliable. You all have become my new go to store for tubes, above all others.
Very satisfied with your service.