This is a well matched pair of Sylvania 6680 / 12AU7A tubes that were made in the USA by Sylvania. The tubes were manufactured to rigorous industrial standards, so you can expect low noise and microphonics. Each of these tubes tests closely to the other, and both are visually almost identical. These tubes have long gray plates, faded or yellow lettering, and halo top getters. These are highly sought after Sylvania 6680 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 these tubes on my recently calibrated Hickok 600a and TV7D/U tube testers.
The test results are as follows:
2,750/2,525
2,650/2,800
| Listed | a year ago |
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| 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.

