name that tube


I have a RCA 5 pin, coke bottle rectifier tube that is either a 5v4 or a 5y3. However, it is not marked. Would the number of pins identity which one it is? Thanks.
darosenb

Showing 1 response by racamuti

Try putting the tube in the freezer for a while, sometimes the markings that have been wiped off will show up in the frost.