Y1506
The Y1506 (P/N 154-0499-00) is an SHF triode vacuum tube used in the 1L20 oscillators (2×).
It was replaced by the Y1641 in 1967.
![](http://w140.com/tekwiki/images/thumb/8/87/Y1506-Y1641.jpg/400px-Y1506-Y1641.jpg)
The Y1506 (P/N 154-0499-00) is an SHF triode vacuum tube used in the 1L20 oscillators (2×).
It was replaced by the Y1641 in 1967.