On Feb 5, 10:10 am, cbx wrote:
This is a small CRT I believe, 41 means long persistance phosphor as
used in radar (slow scan ham use). They were also used in early
Heathkit spectrum display. I may have one in my junk pile.
..
Come to think of it the number does look like a small CRT!
But Heriberto is sure it is transmitting tube, possibly from a marine
service transmitter.
Could the 3P41 be a batch number not a tube type????