Vacuum Tube - 6550WE, Sovtek

Vacuum Tube - 6550WE, Sovtek

Apex Matched
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Starting at: $39.95
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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
SKU:
T-6550WE-SOVT
Item ID:
004604
Brand:
Apex Matched, Sovtek
Type:
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
SingleT-6550WE-SOVT683274021683
Product Measurements by Type
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 versionT-6550WE-SOV-MP5.3 in. × 4.3 in. × 2.2 in.
Apex Matched Quad versionT-6550WE-SOV-MQ5.5 in. × 4 in. × 4 in.
Apex Matched Sextet versionT-6550WE-SOV-MS6.5 in. × 5 in. × 4.25 in.
Single versionT-6550WE-SOVT2 in. × 2 in. × 5.5 in.
Weight (Packaging)Apex Matched Pair versionT-6550WE-SOV-MP0.46 lbs.
Apex Matched Quad versionT-6550WE-SOV-MQ0.92 lbs.
Apex Matched Sextet versionT-6550WE-SOV-MS1.38 lbs.
Single versionT-6550WE-SOVT0.23 lbs.
Product Measurements by Item
T-6550WE-SOV-MP - Apex Matched Pair versionBulb 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
T-6550WE-SOV-MQ - Apex Matched Quad versionBulb 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
T-6550WE-SOV-MS - Apex Matched Sextet versionBulb 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
T-6550WE-SOVT - Single versionBulb 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

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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
Staff Member
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 Anonymous on October 23rd, 2018.
BradWbr
October 23rd, 2018
Staff Member
Using the "5" rating from Groove Tubes, you will want to request a set with middle numbers. Changing a 6L6 to a 6550 may require rebiasing of the amp, yes.
Asked by Anonymous on October 23rd, 2018.
BradWbr
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.

Product Reviews

4.60 out of 5 based on 5 reviews
- July 17th, 2019
5 out of 5

Been repairing gear professionally for over 15 years and these are every bit as good in sound quality and construction as NOS. There are Sovtek 6550s that I have installed in gear over 8 years ago still going strong. Don't buy the NOS hype. Get new and keep these companies alive!

- May 24th, 2019
4 out of 5

Although it's difficult to rate tubes without proper time, I am very happy with these Sovtek 6550WE's. They biased as a perfect match in My 1975 Marshall 50 watt and made the amp sound better than with the sacked out GT's that were in it. My only concern is that one tube glows brighter on the heater filament before the standby is turned on, no matter what socket it's in. Upon closer inspection I noticed it has two humps or "nodes" at the top as opposed to only one on the dimmer glowing tube. They were manufactured about two months apart so maybe its a MFG change that happened at that time. Still great sounding tubes.....so far.

- August 17th, 2015
4 out of 5

Great Tubes! The duet I purchased were very well matched-within 2mA of each other-These 6550's removed the choked,straining sound of the previous set I was using. Tubes seem to be slightly compressed on the bottom and have good clarity on top. Just as good as the more expensive 6550 brands.

- June 13th, 2015
5 out of 5

I purchased these Sovtek 6550WE tubes to replace two tired old GE 6550's in a HP738BR Voltmeter calibrator that I am restoring. In this particular unit they are used in a push-pull configuration because of the high voltage output of the Hp calibrator. These tubes are powerhouses and can handle anything the calibrator needs. No noise, great heat dissipation and rock solid in output. If you need a matched set of great power tubes, these are the best.

- July 26th, 2014
5 out of 5

Received as requested fast service will use this company again