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Vacuum Tube - 6550WE, Sovtek

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SKU:	T-6550WE-SOVT
Item ID:	004604

Starting at: $39^.95

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Type

Power

Vacuum Tubes Apex Matched

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.

Matched versions of this tube use Apex Matching

Part Numbers
Single or Matched	Our Part Number	UPC/EAN
Apex Matched Pair	T-6550WE-SOV-MP	609722129749
Apex Matched Quad	T-6550WE-SOV-MQ	609722129756
Apex Matched Sextet	T-6550WE-SOV-MS	609722129763
Single	T-6550WE-SOVT	683274021683

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Specifications, Files, and Documents

Specification Sheet

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Product Measurements by Type (click to expand)

Product Measurements by Type
Bulb Temperature		250°C
Cathode Current, Tetrode		230 mA
Cathode Current, Triode		192.5 mA
Cathode to Filament Voltage, Negative		300 V
Cathode to Filament Voltage, Positive		200 V
Filament Voltage (U_f)		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 (R_g), Fixed Bias		0.051 MΩ
Grid Circuit Resistance (R_g), Self Bias		0.24 MΩ
Plate Current (I_a)		190 mA
Plate Dissipation (W_a)		44 W
Plate Voltage, tetrode (U_a)		800 V
Plate Voltage, triode (U_a)		440 V
Screen Dissipation		6.6 W
Screen Voltage, tetrode		440 V

Packaging Information
Packaging Dimensions	Apex Matched Pair version	5.3 in. × 4.3 in. × 2.2 in.
	Apex Matched Quad version	5.5 in. × 4 in. × 4 in.
	Apex Matched Sextet version	6.5 in. × 5 in. × 4.25 in.
	Single version	2 in. × 2 in. × 5.5 in.
Weight (Packaging)	Apex Matched Pair version	0.46 lbs.
	Apex Matched Quad version	0.92 lbs.
	Apex Matched Sextet version	1.38 lbs.
	Single version	0.23 lbs.

Product Measurements by Item (click to expand)

Product Measurements by Item
T-6550WE-SOV-MP - Apex Matched Pair version	Bulb Temperature	250°C
	Cathode Current, Tetrode	230 mA
	Cathode Current, Triode	192.5 mA
	Cathode to Filament Voltage, Negative	300 V
	Cathode to Filament Voltage, Positive	200 V
	Filament Voltage (U_f)	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 (R_g), Fixed Bias	0.051 MΩ
	Grid Circuit Resistance (R_g), Self Bias	0.24 MΩ
	Plate Current (I_a)	190 mA
	Plate Dissipation (W_a)	44 W
	Plate Voltage, tetrode (U_a)	800 V
	Plate Voltage, triode (U_a)	440 V
	Screen Dissipation	6.6 W
	Screen Voltage, tetrode	440 V
T-6550WE-SOV-MQ - Apex Matched Quad version	Bulb Temperature	250°C
	Cathode Current, Tetrode	230 mA
	Cathode Current, Triode	192.5 mA
	Cathode to Filament Voltage, Negative	300 V
	Cathode to Filament Voltage, Positive	200 V
	Filament Voltage (U_f)	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 (R_g), Fixed Bias	0.051 MΩ
	Grid Circuit Resistance (R_g), Self Bias	0.24 MΩ
	Plate Current (I_a)	190 mA
	Plate Dissipation (W_a)	44 W
	Plate Voltage, tetrode (U_a)	800 V
	Plate Voltage, triode (U_a)	440 V
	Screen Dissipation	6.6 W
	Screen Voltage, tetrode	440 V
T-6550WE-SOV-MS - Apex Matched Sextet version	Bulb Temperature	250°C
	Cathode Current, Tetrode	230 mA
	Cathode Current, Triode	192.5 mA
	Cathode to Filament Voltage, Negative	300 V
	Cathode to Filament Voltage, Positive	200 V
	Filament Voltage (U_f)	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 (R_g), Fixed Bias	0.051 MΩ
	Grid Circuit Resistance (R_g), Self Bias	0.24 MΩ
	Plate Current (I_a)	190 mA
	Plate Dissipation (W_a)	44 W
	Plate Voltage, tetrode (U_a)	800 V
	Plate Voltage, triode (U_a)	440 V
	Screen Dissipation	6.6 W
	Screen Voltage, tetrode	440 V
T-6550WE-SOVT - Single version	Bulb Temperature	250°C
	Cathode Current, Tetrode	230 mA
	Cathode Current, Triode	192.5 mA
	Cathode to Filament Voltage, Negative	300 V
	Cathode to Filament Voltage, Positive	200 V
	Filament Voltage (U_f)	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 (R_g), Fixed Bias	0.051 MΩ
	Grid Circuit Resistance (R_g), Self Bias	0.24 MΩ
	Plate Current (I_a)	190 mA
	Plate Dissipation (W_a)	44 W
	Plate Voltage, tetrode (U_a)	800 V
	Plate Voltage, triode (U_a)	440 V
	Screen Dissipation	6.6 W
	Screen Voltage, tetrode	440 V

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Product Reviews

4.60 out of 5 based on 5 reviews

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!

Branson SoundWorks - July 17th, 2019

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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.

Mark M. - May 24th, 2019

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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.

Dave Sims - August 17th, 2015

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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.

Wilson Electronics - June 13th, 2015

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5 out of 5

Received as requested fast service will use this company again

Mal - July 26th, 2014

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Questions and Answers

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Why get a matched set? I want to replace 4 tubes in a jolida amp. Thanks 1 answers

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Asked by Anonymous on January 5th, 2017.

Answers (1)

Matt H.

Staff Member

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.

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Will a matching pair of the Sovtek 6550WE replace a red level 5 matching pair of the GT 6L6R? If so will the intended 1987 Fender Concert Amp need to be rebiased?1 answers

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Asked by Anonymous on October 23rd, 2018.

Answers (1)

BradWbr

Staff Member

October 23rd, 2018

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.

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Are the Sovtek 6550WE tubes performance level rated with the Apex matching? If so what levels are available at AP?1 answers

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Asked by Anonymous on October 23rd, 2018.

Answers (1)

BradWbr

Staff Member

October 23rd, 2018

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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