Lundahl Tube Line output transformer, LL1970

Lundahl Tube Line output transformer, LL1970

LL1970 is a tube line output transformer designed for ECC88 push-pull drive.
The LL1970 can be used 5.5 : 1 or 11 : 1 and have a tertiary winding for feedback purposes.
The LL1970 has a silicon-iron C-core for high signal level capability in a compact design.

Turns ratio: 5.5+5.5 : 1+1+0.5
Dims (Length x Width x Height above PCB (mm)): 45 x 32 x 22

Spacing between pins: 5.08 mm (0.2")
Spacing between rows of pins: 35.56 mm (1.4")
Weight: 125 g
Rec. PCB hole diameter: 1.5 mm
Static resistance of each primary winding:: 660 Ohm
Static resistance of each secondary winding: 18 Ohm
Static resistance of tertiary winding: 55 Ohm

Maximum output level before saturation (primaries in series): 90V rms @ 50 Hz
Corresponding output signal at above input signal : 16V rms
Isolation between primary and secondary windings / between windings and core: 4 kV / 2 kV