NOS MULLARDECC33 ~ 6SN7 Price is for 2 NOS dual triode tubes. Super rare and one of the most-desired dual triodes ever made. It's early production from the 1950s with so-called short base. Etched codes visible on the pictures. Test VERY GOOD & one with closely BALANCED sections as follow: Tube 1 Ia1 = 7.2 mA | S1 = 2.6 mA/V | Ri1 = 14.6 kOhm | μ1 = 38.0
Ia2 = 9.0 mA | S2 = 2.9 mA/V | Ri2 = 11.6 kOhm | μ2 = 33.6 Tube 2 Ia1 = 9.6 mA | S1 = 3.2 mA/V | Ri1 = 10.8 kOhm | μ1 = 34.6
Ia2 = 9.9 mA | S2 = 3.5 mA/V | Ri2 = 10.6 kOhm | μ2 = 37.1 Test under: Uh=6.3V | Ua=250V | Ug1=-4.0V Where 100% is Ia=9.0mA and S=3.6mA/V Very rare preamp tubes with superb results! Shipping will be Airmail registered with tracing number. Other shipping methods available on request.
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