Sylvania Made For Hammond 5Y3GT Tall Boy Black Plate Rectifier Single NOS 5Y3

This is a Sylvania 5Y3GT vacuum tube. It was manufactured by Sylvania for Hammond to rigorous specifications for superior quality and long life. This tube has a tall glass bottle with Sylvania markings on the slim base.  It tests very strong, with greater than NOS readings. It has black box plates, red lettering, clear glass, and top 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

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