National Union JAN 5Y3GT Black Plate Matched Pair Rectifier NOS 5Y3

This is a well matched pair of National Union JAN 5Y3GT vacuum tubes. They were manufactured to rigorous military specifications for superior quality and long life. These tubes have a tall glass bottle with a National Union label on the base.  They test very strong, with greater than NOS readings. They are visually almost identical. They have black oval plates, white lettering, clear glass, and bottom getters. These are excellent National Union 5Y3 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 this tube 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.