Lundahl Line output transformer, LL2731-PP

Low impedance tube amplifier line output transformer LL2731-PP

The LL2731 is a four-sectioned dual coil C-core tube amplifier interstage / line output transformer for low impedance applications. LL2731 is available in PP and SE versions. The coil is wound using our standard high internal isolation technique with isolation foil between each copper layer. The core is an audio C-core of our own production.

Turns ratio 1+1 : 1+1
Weight: 0.6 kg
Static resistance of each primary (pins 1-2, 4-5): 48?
Static resistance of secondary: 50 W
Isolation between windings / between windings and core: 4 kV / 2 kV
Max recommended DC current through any primary winding: 220mA (5W heat dissipation)

Primary inductance (approx): 42H
Max signal across each section, at 30 Hz: 75V r.m.s.