Sylvania Made For PhilCo 5Y3GT Early 50s Black Plate Rectifier Matched Pair NOS

This is a well matched pair of Sylvania 5Y3GT vacuum tubes. These are from the legendary Sylvania early 1950s tube factories and sound great! They were manufactured to rigorous specifications for superior quality and long life. These tubes have a medium glass bottle with Sylvania factory code 312 on the base.  They test very strong, with greater than NOS readings. They have black plates, yellow lettering, clear glass, and bottom getters. 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.