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Svetlana / SED "Winged C" 6550C - matched quad

SED
Manufacturer: SED
The 1998 Svetlana 6550C tubes in this precisely matched quad (4) were made in St. Petersburg, Russia (before New Sensor purchased the Svetlana name). The etched print on the glass has the Svetlana logo and OTK factory mark.

All four tubes
have been burned in and tested on a laboratory grade Amplitrex AT1000. They are screened for shorts and excessive leakage, gas, and noise / microphonics. They are matched for both current draw (63.6-65.4 mA) and transconductance (7000-7200 Gm) at typical operating conditions. Learn more about our testing process here.

These tubes are sold as a matched quad (4 matched tubes). They ship in new white boxes with test results for current draw (mA) and transconductance (Gm). Larger matched quantities are available by request. Photo is of the actual tubes.

Precision Power Tube Matching

Our power tubes are burned in for 48 hours and tested on a laboratory grade Amplitrex AT1000 tube tester (fixed bias mode, manual setting). They are screened for shorts, gas, leakage, and noise. We test and match tubes for both current draw (mA) and transconductance (Gm) at typical operating conditions for no extra charge.

The questions listed below allow you to provide information about your operating conditions that will help us select the best matched set of power tubes for your amplifier. Why this matters
1. What is the manufacturer and model of your amplifier?
2. How is your amp biased?   Why we ask
Price per matched set: $279.00
1 matched quad in stock

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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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