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Svetlana SED "Winged C" 6550C - matched quad
 The 2008 Svetlana / SED "Winged C" 6550C tubes in this precisely matched quad (4) were
made in St. Petersburg, Russia. The etched print on the glass has the
=C= logo and OTK factory mark.
All four tubes
have been tested at 500V on a laboratory grade Amplitrex AT1000 and
burned in at typical operating conditions on our test circuit. They
are screened for shorts and excessive leakage, gas, and noise /
microphonics. They are matched for both current draw (85.6-88.6 mA) and
transconductance (7200 Gm = 112%) at typical operating conditions. Learn more about our testing process here.
PLEASE NOTE: These tubes test significantly higher than spec.
However, they are stable at typical operating voltages provided you have
the ability to bias your amp. If your amplifier is approved for using
KT120 tubes, these tubes will work fine. They bias up in a similar range
as KT120 tubes.
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.
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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 matched set: $389.00
1 matched quad
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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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