Price is for 1 NOS preamp dual triode tube. Construction with single O-getter and long gray plates. Note also the gold posts that hold the structure inside. Produced in England.
Tested VERY STRONG as follow:
Ia1 = 18.7 mA | S1 = 11.1 mA/V | Ri1 = 2.4 kOhm | μ1 = 26.6
Ia2 = 15.9 mA | S2 = 11.3 mA/V | Ri2 = 2.7 kOhm | μ2 = 30.5
Tested under: Uf = 6.3V | Ua = 90V | Ug1 = -1.3V
Good starts at: Ia=8.5mA and 100% is Ia=15.0mA
Shipping will be Airmail registered with tracing number. Other shipping methods available on request.