Lundahl LL1623 Tube Amplifier Output Transformer

The LL1620, LL1623, LL1627 and LL9202 are output transformers for tube amplifiers. All transformers are based on the same core size, winding structure and secondaries, but differ in n umber of turns (and thus impedance level) of primaries. 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 f requency range. The transformers have a special audio C - core of our own production, which is gapped for desired DC current. The transformers are of open frame type suitable for mounting inside an amplifier housing.

Specifications

Turns Ratio: 4 x 13:4 : 8 x 1
Static resistance of primary (all in series):164 Ohm (4 - 41 Ohm)
Static resistance of each secondary (average): 0,4Ohm
Primary leakage inductance (all in series): 11mH
Max. recommended primary DC current (heat dissip. 7W): 150mA
Max. primary signal voltage r.m.s. at 30Hz. (all in series): Push-Pull 860V, Single End 380V