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Vintage Svetlana 6550B-3 "clear top" - precision matched
 These distinctive early 1990s Svetlana 6550B-3 tubes have side getters with no flashing on the top or sides. They were made at the SED SPb factory in St. Petersburg (home of the famous "winged C" Svetlana tubes before the New Sensor folks grabbed that name and started using it on tubes made in a different factory).
These tubes have been burned in, tested at typical operating voltages on a laboratory grade Amplitrex AT1000, and precisely matched for both current draw (mA) and transconductance (Gm). Learn more about our burn-in and testing process here.
Price is for a single tube and includes burn-in and standard matching service. Tubes ship in Svetlana retail boxes. |
Precision Power Tube Matching
Our power tubes are burned in and then tested on a laboratory grade Amplitrex AT1000 tube tester. We match tubes for both current draw (mA) and transconductance (Gm) at typical operating conditions (plate: 500V, screen: 300V, grid bias: -30.5V).
After burn in and testing, we hand select and custom match every power tube order we receive. To do this, each power tube set is also run on a custom, fully variable test fixture that can match the operating conditions of your amplifier based on the information you provide below. This enables us to do a final check of the power tube set's performance and matching under load.
Why this matters
1. What is the manufacturer and model of your amplifier?
2. How is your amp biased? Why we ask
3. Matching notes Why we ask
If you know the plate, screen, and grid bias voltages your amplifier uses, please note them in the comments section when you check out and we will use this information when we select and match your power tube set. (If you don't know, don't worry--we can make an educated guess based on your amp's make and model, if we don't already know the voltages it uses.) If you are a guitarist, you can also specify if you prefer early or late breakup. Thanks!
CAUTION
Price per single tube: $69.00
Enter total number of tubes needed for your matched set
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TC Tubes specializes in precision testing and matching of vintage and new production vacuum tubes for guitar & bass players, audiophiles, and DIY tube audio enthusiasts. Our website features secure payment options and fast, convenient shipping around the world.
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