***RARE*** Sylvania JAN 5Y3GT/G w/Large Cooling Fins, Black Plate Rectifier Matched Pair NOS VT197 VT-197-A

This is a well matched pair of Sylvania JAN 5Y3GT/G vacuum tubes. They have extra large cooling fins not normally seen in 5Y3 tubes. They were manufactured to rigorous military specifications for superior quality and long life. These tubes have a medium glass bottle with Sylvania markings on the base. They test very strong, with greater than NOS readings. They have black plates, white lettering, clear glass, and bottom getter. These are excellent Sylvania 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.