Raytheon 5687 Bronze Plates Well Matched (1.1%) Pair NOS 5687WA

This is an almost perfectly matched pair of Raytheon 5687 tubes. Each one of these tubes are closely balanced, and they test very similar to each other. These tubes are visually identical.  They were manufactured to rigorous industrial specifications, so you can expect low noise and microphonics. These tubes have long black plates with significant bronzing, yellow lettering, and a halo top getter. These are highly sought after Raytheon 5687 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:

10,875/11,000
11,000/11,000