VU39 AIR MINISTRY SPECIFCATION STC FOOTSCRAY PRE 1951 10E/9600 MU14

This rectifier type had the distinction in 1933 of being Marconi – Osram’s first ever indirectly heated rectifier valve. Many other manufacturers developed and marketed an equivalent with Mazda introducing the equivalent UU4 and UU5 in 1935 and 1936 respectively.

Showing superb performance it has a place alongside that other famed B4 based produce the PX4 & PX25.