Vacuum Tube - 6550WE, Sovtek

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Vacuum Tube - 6550WE, Sovtek

Starting at: $32.95
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The Sovtek 6550WE was designed to be the finest 6550 ever produced. Thicker plates, improved heat dissipation, higher transconductance, and increased linearity are just some of the inherent aspects of the new Sovtek super 6550s. The resulting performance advantages include 5% higher output power, increased reliability, greater headroom, and superior tone. The 6550WE features a metal-ringed base for increased power-handling capabilities.

Apex Tube Matching
Matched versions of this tube use Apex Matching
Item ID:
Sovtek, Apex Matched
Part Numbers
Single or MatchedOur Part NumberUPC/EAN
Apex Matched PairT-6550WE-SOV-MP609722129749
Apex Matched QuadT-6550WE-SOV-MQ609722129756
Apex Matched SextetT-6550WE-SOV-MS609722129763
Product Measurements
Bulb Temperature250°C
Cathode Current, Tetrode230 mA
Cathode Current, Triode192.5 mA
Cathode to Filament Voltage, Negative300 V
Cathode to Filament Voltage, Positive200 V
Filament Voltage (Uf)5.7 V - 6.9 V
Grid 1 Voltage-300 V
Grid 2 Voltage, Tetrode-600 V
Grid 2 Voltage, Triode-440 V
Grid Circuit Resistance (Rg), Fixed Bias0.051 MΩ
Grid Circuit Resistance (Rg), Self Bias0.24 MΩ
Plate Current (Ia)190 mA
Plate Dissipation (Wa)44 W
Plate Voltage, tetrode (Ua)800 V
Plate Voltage, triode (Ua)440 V
Screen Dissipation6.6 W
Screen Voltage, tetrode440 V
Packaging Information
Packaging DimensionsApex Matched Pair version5.3 in. × 4.3 in. × 2.2 in.
Apex Matched Quad version5.5 in. × 4 in. × 4 in.
Apex Matched Sextet version6.5 in. × 5 in. × 4.25 in.
Single version2 in. × 2 in. × 5.5 in.
Weight (Packaging)Apex Matched Pair version0.46 lbs.
Apex Matched Quad version0.92 lbs.
Apex Matched Sextet version1.38 lbs.
Single version0.23 lbs.

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Specifications, Files, and Documents

PDF: Specification Sheet Specification Sheet403.65 KB

Questions and Answers

Click each question to see its answers.
Asked by Anonymous on January 5th, 2017.
Matt H
January 5th, 2017
In order for most amplifiers to function properly, amps need to have a similar cathode current. Matching power tubes allows this to occur.
Asked by John Anthony Menanno on October 21st, 2018.
October 23rd, 2018
Staff Member
Apex matched tubes are rated by plate current and transconductance. Similar to Groove Tubes, we have low. medium, and high ratings available and would be happy to supply you with the type of set you prefer. Please include an order note when making an order.

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