Sylvania JAN 6X4W Matched Pair NOS Rectifier 6X4 6X4W EZ90

This is a matched pair of Sylvania JAN 6X4W vacuum tubes. These tubes have a 7 pin tall glass bottle with Sylvania markings on the tubes.  They test very strong, with greater than NOS readings. They are visually very similar to each other. They were manufactured to rigorous industrial specifications so you can expect low noise and extended heater life. These tubes have black plates, clear glass, green lettering, and top getter. This is an excellent pair of Sylvania 6X4W 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:

Pass/Pass

Pass/Pass

*Rectifiers test on a pass fail scale, they are not measured on gm or transconductance.