Price is for 1 tested tube. This is one very desired dual triode valves made in Mullard Mitcham plant in England. With rare solid metal dimple getter.
Tested GOOD as follow:
Ia1 = 10.2 mA | S1 = 8.8 mA/V | Ri1 = 4.6 kOhm | μ1 = 40.5
Ia2 = 10.6 mA | S2 = 8.9 mA/V | Ri2 = 4.4 kOhm | μ2 = 39.2
Tested under: Uf = 6.3V | Ua = 90V | Ug1 = -1.3V
Good starts at: Ia=8.5mA
Shipping will be Airmail registered with tracing number. Other shipping methods available on request.