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Precision Matched Power Tubes
Accurate power tube matching can minimize the risk of early tube failure and maximize power tube performance in your amp. All our precision matched power tubes are:
- Ordered from the most desirable test results range from the manufactuer
- Tested with Amplitrex AT1000 testers at typical operating conditions and matched for both current draw (mA) and transconductance (Gm) (more info)
- Run under load in a custom test fixture that can match your operating conditions (more info)
A note from Tyler on processing new production power tubes:
At TC Tubes, we avoid most quality control issues with new production power tubes by ordering tubes that are tested and matched by the manufacturer. This costs us more on the front end but I don't get the rejects that the manufacturer screens out. This also allows me to specify the range of test results for each order, so I receive tubes that are in the most desirable range.
I don't rely on the manufacturer's matching. I then retest those tubes and match them into sets using my own methods. In the end, I run the tube sets under the operating conditions they will be seeing in the amplifier that the customer has, if known, to verify that they are matched at those voltages before shipping.
If I see problems with tubes as I go through this process I simply return the faulty tube. This method is time intensive, but as a result I don't get hardly any customer returns on power tubes.
Most tube resellers will buy the tubes in larger quantities and in untested condition. They will end up with a range from about 70% to over 200% of expected values. I will not play that game anymore. Too many rejects for the factory to take back. Paying for screening on the front end saves me time and hassle in the end.
My customers get tubes screened three times (once by the manufacturer, once in my initial tests on the AT1000 testers, and finally in a matching fixture at actual operating voltages for end user's application) and much better matched than otherwise possible.
The 1987 Gold Aero 6550A tubes in this precisely matched quad have coke bottle shaped glass, black plates with extra support rods, and metal collar bases. Click "more info" for test results.
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The Svetlana / SED 6550C tubes in this matched octet (8) were made in St. Petersburg, Russia in 2008. The etched print on the glass has the Svetlana logo and OTK factory mark. All eight tubes are matched for current draw (47.0 mA) and Gm (6400 = 100%).
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The Valve Art 6550A tubes in this matched pair have top and side getters with lots of flashing, with a similar look as the vintage GE 6550A tubes. The gold print on the glass has the Valve Art logo and reads "6550A O & J CHINA."
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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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