Lundahl Tube amplifier output transformer, LL1679

Tube Amplifier Output Transformers LL1679

LL1679 is an output transformer for tube amplifiers, available with different core air-gaps for different types of output stages. The transformers are highly sectioned with harmonically sized sections, which results in a minimum leakage inductance. This combined with a low capacitance coil winding technique results in a wide frequency range. The primary winding can be tapped for 36% UL connection. The transformers have a special audio C-core of our own production. The transformers are unpotted, open frame type suitable for mounting inside an amplifier housing.

Pin spacing module: 5.08 mm (0.2")
Row spacing: 76mm approx.
Weight: 2.5 kg
Turns ratio: 22 + 12.5 + 22 + 12.5 : 2 + 1 + 2 + 1
Static resistance of primary (all in series): 160 W (2 x 54W + 2 x 26W )
Static resistance of inner/outer secondary winding: 0.5W / 0.3W
Primary leakage inductance (all in series) 8 mH
Max. primary signal voltage r.m.s. at 30 Hz (all in series): Push-Pull 670V, Single End 295V

Isolation between primary and secondary windings / between windings and core: 3 kV / 1.5 kV