Price is for 1 dual triode preamp tube. Made by RCA in the US during the 1950s or 1960s. This is one of the most-desired type - with the square getter and black long plates. Code is one of those: 19E I9E
Tested VERY STRONG as follow! Ia1 = 10.6 mA | S1 = 1.8 mA/V | Ri1 = 8.5 | μ1 = 15.3 Ia2 = 11.5 mA | S2 = 2.0 mA/V | Ri2 = 7.2 | μ2 = 14.4 Tested under: Uf = 12.6V | Ua = 250V | Ug1 = -8.5V Good starts at Ia=7.0mA and 100% is Ia=10.5mA
Shipping will be Airmail registered with tracing number. Other shipping methods available on request.