Lundahl LL1660 Transformer

LL1660 is an interstage / line output transformer for tube amplifiers. The transformer is available with different core air gap for PP or SE drives. The transformer is wound with a sp ecial low capacitance winding technique to achieve best high frequency performance. The transformer has a special high flux, low distortion audio C - core of our own production. The LL1660PP is assembled with a small core air gap to allow for some DC curren t unbalance. For the S.E. versions of the LL1660, the core air gap is chosen such that the denoted DC current (18 mA for a LL1660/1 8 mA) generates a no signal core flux density of 0.9 Tesla when used with all primaries in series. This leaves a flux density swing of 0.7 T for the signal.

Turns Ratio:   1+1+1+1 : 2.25+2.25

Weight:    0.75 kg

Static Resistance, winding A:   315 ohms

Static Resistance, winding B:    240 ohms

Static Resistance, winding C:  625 ohms

Max. Current through any single section:  50mA

Isolation between primary and secondary windings / between windings and core: 4 kV / 2 kV