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.
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APV4, TUNGSRAM, MATCHED PAIR,1951 MANUFACTURE, 1867, 1W4-350, CV1039, MU14, R3, R42, UU5
CV1039, MARCONI WIRELESS TELEGRAPH, MIL SPEC MU14, BLACK BASE, MARCH 1959 MANUFACTURE
CV1039, MARCONI WIRELESS TELEGRAPH, MIL SPEC MU14, ST SHAPE, BROWN BASE, NOV 1955 MANUFACTURE