This is a balanced single Raytheon Uniline 12AX7A tube. It was made in the USA by Raytheon. The plates are nicely matched and balanced. This tube was manufactured to rigorous specifications for reduced noise and microphonics. This tube has long gray plates, yellow lettering, and a halo getter. These are highly sought after Raytheon 12AX7A 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 tested this tube on my recently calibrated Hickok 600a and TV7D/U tube testers.

The results are as follows:

1,775/1,900