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GE 6550 / 6550A - welded plates
The 1970s GE 6550A power tubes in this precisely matched pair have welded gray plates, 3 getters, and metal collar bases. The white print on the glass has the GE logo and 188-5 factory code (Owensboro, Ky). The glass is etched
with "6550A U.S.A." and the dot pattern characteristic of GE tubes.
Both tubes test as
new and are precisely matched for both current draw (52.1 mA & 54.9 mA) and transconductance (6200 & 6400 Gm) at 500VDC. They have
been screened for shorts and excessive leakage, gas, and noise /
microphonics. Learn more about our burn-in and testing process here.
They ship in new white
boxes with test results for each tube. It is very hard to find matched pairs of vintage power tubes like these—grab them while supplies last!
These tubes are sold as a matched pair (2 tubes).
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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
What is the manufacturer and model of your amplifier?
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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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