This is a well matched pair of Sylvania 6SL7GT vacuum tubes. The tubes have a medium glass bottle and both have the GE logo printed on them.  These tubes are visually fairly closely matched. They test very close to each other. They were manufactured to rigorous industrial standards so you can expect low noise and microphonics. They have round, black plates, clear glass, white lettering, and top getters. These are excellent Sylvania 6SL7 tubes that are highly sought after, act quickly before these sell out! More available upon request.

Be careful buying tubes from sellers who list tubes as matched if they do not provide test results or the equipment that they tested their tubes on.

I personally tested these tubes on my recently calibrated Hickok 600a and my TV7D/U and the results are as follows:

2,275/2,150
2,025/1,900