Vacuum Tube - 5881 / 6L6WGC, Sovtek

Vacuum Tube - 5881 / 6L6WGC, Sovtek

Sovtek
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Starting at: $36.45
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The 5881 is a very reliable tube that is widely used in many current production tube amplifiers. It has a warm tone with good 'bite.' This modern version is able to tolerate higher voltages than its 5881 / 6L6 cousins. 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. Maximum plate voltage is 250 volts while maximum plate current is 73 mA. The 5881 has a Transconductance rating of 6000 micromhos and a maximum output power of 5.8 watts.

Apex Tube Matching
Matched versions of this tube use Apex Matching
SKU:
T-5881-SOVT
Item ID:
004545
Brand:
Sovtek, Apex Matched
Type:
RoHS Compliant
Part Numbers
Single or MatchedOur Part NumberUPC/EAN
Apex Matched PairT-5881-SOVT-MP609722124010
Apex Matched QuadT-5881-SOVT-MQ609722124027
SingleT-5881-SOVT683274021294
Product Measurements by Type
Capacitance, Cathode to Heater11 pF
Capacitance, Transfer1.0 pF
Capacitance, input11 pF
Capacitance, output6.7 pF
Cathode to Heater Insulation Resistance4 MΩ
Filament Current (If)840 - 920 mA
Grid 1 Insulation Resistance200 MΩ
Grid 1 Inverse Current0.5 mA
Grid 2 Current6 mA
Height, base to top3.25 in.
Internal Resistance (Ri)18 kΩ - 75 kΩ
Non-linear Harmonic Distortion15 %
Output Power (POut)5.8 W
Plate Current (Ia)60 mA - 86 mA
Readiness Time50 s
Transconductance (S)5.2 mA/V - 6.8 mA/V
Packaging Information
Packaging DimensionsApex Matched Pair versionT-5881-SOVT-MP5.1 in. × 3.5 in. × 1.8 in.
Apex Matched Quad versionT-5881-SOVT-MQ5.1 in. × 3.5 in. × 3.5 in.
Single versionT-5881-SOVT1.5 in. × 1.5 in. × 4 in.
Weight (Packaging)Apex Matched Pair versionT-5881-SOVT-MP0.294 lbs.
Apex Matched Quad versionT-5881-SOVT-MQ0.588 lbs.
Single versionT-5881-SOVT0.147 lbs.
Product Measurements by Item
T-5881-SOVT-MP - Apex Matched Pair versionCapacitance, Cathode to Heater11 pF
Capacitance, Transfer1.0 pF
Capacitance, input11 pF
Capacitance, output6.7 pF
Cathode to Heater Insulation Resistance4 MΩ
Filament Current (If)840 - 920 mA
Grid 1 Insulation Resistance200 MΩ
Grid 1 Inverse Current0.5 mA
Grid 2 Current6 mA
Height, base to top3.25 in.
Internal Resistance (Ri)18 kΩ - 75 kΩ
Non-linear Harmonic Distortion15 %
Output Power (POut)5.8 W
Plate Current (Ia)60 mA - 86 mA
Readiness Time50 s
Transconductance (S)5.2 mA/V - 6.8 mA/V
T-5881-SOVT-MQ - Apex Matched Quad versionCapacitance, Cathode to Heater11 pF
Capacitance, Transfer1.0 pF
Capacitance, input11 pF
Capacitance, output6.7 pF
Cathode to Heater Insulation Resistance4 MΩ
Filament Current (If)840 - 920 mA
Grid 1 Insulation Resistance200 MΩ
Grid 1 Inverse Current0.5 mA
Grid 2 Current6 mA
Height, base to top3.25 in.
Internal Resistance (Ri)18 kΩ - 75 kΩ
Non-linear Harmonic Distortion15 %
Output Power (POut)5.8 W
Plate Current (Ia)60 mA - 86 mA
Readiness Time50 s
Transconductance (S)5.2 mA/V - 6.8 mA/V
T-5881-SOVT - Single versionCapacitance, Cathode to Heater11 pF
Capacitance, Transfer1.0 pF
Capacitance, input11 pF
Capacitance, output6.7 pF
Cathode to Heater Insulation Resistance4 MΩ
Filament Current (If)840 - 920 mA
Grid 1 Insulation Resistance200 MΩ
Grid 1 Inverse Current0.5 mA
Grid 2 Current6 mA
Height, base to top3.25 in.
Internal Resistance (Ri)18 kΩ - 75 kΩ
Non-linear Harmonic Distortion15 %
Output Power (POut)5.8 W
Plate Current (Ia)60 mA - 86 mA
Readiness Time50 s
Transconductance (S)5.2 mA/V - 6.8 mA/V

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet444.19 KB

Questions and Answers

Click each question to see its answers.
Asked by Anonymous on November 19th, 2015.
JustinG
November 19th, 2015
Staff Member
Top Contributor
The Max Dissipation is 23.5 watts.
Asked by Anonymous on February 23rd, 2018.
Matt H.
February 28th, 2018
Staff Member
From the Line 6 Spider Valve mkii HD100 manual, your amp takes a pair of 5881's and these should work.
Asked by Anonymous on March 10th, 2020.
BradWbr
March 11th, 2020
Staff Member
Power tubes are electrically matched so each tube will have the same amount of “idle” plate current and amplification characteristics when used in an amplifier. This is done so the tubes can work together in your amp giving you optimal sound quality and tube longevity. Matched tubes also receive extra quality checks to reduce the possibility of getting a faulty power tube that may have slipped by the manufacturer.

Product Reviews

4.50 out of 5 based on 6 reviews
ku5qe.com - August 21st, 2021
2 out of 5

Recently received 4 of these supposedly matched. They don't appear to me that they are. Is this Apex Matching for real? I have my doubts, or someone made a mistake boxing them up. At a constant plate V of 495VDC, there is a difference of 10 to 12mA plate to cathode current between each tube. The amo is a SLO100. The problem is not the amp as this difference in plate current follows each tube no matter where they are placed in the amp's power section. Otherwise, they sound fine biased @ 25 to 35mA (this is the spread between all 4 tubes in the SLO100). I've never got a bad tube ever from Antique Electronic Supply, so I'll hang onto them, and see how long these hold up where I have them set. Which according to my figures is just under 70% of max rating.

JimmyZ - December 25th, 2019
5 out of 5

I bought matching quartet to replace my older Sovtek 5881`s...almost one full year one of these failed.Went full purple with HUGE hum from speakers.I removed the tubes and put the old pones back in...way better.They do not make tubes worth a crap anymore.I had exact same issue with RUBY...brand new,one failed in about 2 months.So far the MULLARD EL34`s are holding up.

bowthom - November 16th, 2019
5 out of 5

These Sovtek 5881 tubes are perfect for my 1966 Supro Thunderbolt. This amp runs the tubes hot and they just seem to like it that way. Nice crunch when pushed hard.

Adam 1000 - February 9th, 2019
5 out of 5

These things sound RAD! Tight, nice compression.

Jim Bilenda - January 29th, 2017
5 out of 5

Very pleased with the "sound" of these Sovteks. Smooth midrange and high end with solid bass. I like these better than some of the more expensive 6L6's

Rick Shaw - April 19th, 2015
5 out of 5

Good basic power 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.