This is a balanced single RCA 12AU7 tube that was made in the USA for Conn and it has the RCA factory code 274 on the tube. This tube was manufactured to rigorous specifications and you can expect low noise and great performance. This tube has plates that test closely to each other. This tube has long black plates, red lettering, and an angled square top getter. These are highly sought after RCA 12AU7 tubes, act quickly before they sell out!! More available upon request.
Be careful buying tubes from other sellers who list "matched pairs" but do not provide test results or specify the equipment that they use to test their tubes.
I personally hand tested this tube on my recently calibrated Hickok 600a and TV7D/U tube testers.
The test results are as follows:
2,175/2,450
| Listed | a year ago |
|---|---|
| Condition | Excellent (Used) Excellent items are almost entirely free from blemishes and other visual defects and have been played or used with the utmost care.Learn more |
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Product safety information may be available here.

