Lundahl Mains Transformers

Lundahl manufactures a limited range of C-core mains transformers, primarily for tube amplifiers. Their transformers are best used with bridge rectifier circuits (four diodes), but some transformers can also be used with full wave rectifier circuits.

The transformer primaries are connected in series for 210 – 250V and in parallel for 105 – 125V. Secondary voltages are calculated for 230V / 115V primary voltage. The secondary voltage listed are the no-load voltage. Voltage drop because of load can be calculated from transformer copper resistance and load current. About 75% of power should be taken from secondary 1 for optimal use.

In our mains transformers, a small deliberate C-core air gap is used to prevent core saturation caused by any DC unbalance in the mains outlet.

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To learn more about the specifications, primary winding, secondary winding etc... of the entire range on offer from Lundahl please click below.

PDF datasheet

Lundahl Mains and Isolation Transformer Specifications228.63 KB

LL1648: Lundahl Mains Transformer

C-core mains transformers. The core is assembled with a small air gap to compensate for any mains imbalance. The estimated power rating is 250 VA,…

LL1649: Lundahl Mains Transformer

LL1649 is a C-core mains transformer. The core is assembled with a small air gap to compensate for any mains imbalance. The estimated power rating is…

LL1650: Lundahl Mains Transformer

LL1650 is a C-core mains transformer. The core is assembled with a small air gap to compensate for any mains imbalance. The estimated power rating is…

LL1651: Lundahl Mains Transformer

LL1651 is a C-core mains transformer. The core is assembled with a small air gap to compensate for any mains imbalance. The estimated power rating is…

LL1665: Lundahl Mains Transformer

LL1665 is a C-core mains transformer. The core is assembled with a small air gap to compensate for any mains imbalance. The estimated power rating is…

LL1669A: Lundahl Mains Transformer

LL1669A is a C-core mains transformer. It has 6 secondary windings, a 340V, 0.55A HT plus 4 6.3V, 3.1A valve heater and a 110V, 40mA bias winding.…

LL1683: Lundahl Mains Transformer

The LL1683 is a C-core mains transformer with seven secondary windings. The core is assembled with a small air gap to compensate for any mains DC…

LL2738: Lundahl Mains Transformer

LL2738 is a C-core (with a small air gap) main transformer for applications where many tube filaments need supply. Offering 8 x 6.6A, 3A windings,…

LL2740: Lundahl Mains Transformer

The LL2740 is a C-core mains transformer made up of 4 secondary windings. The core is assembled with a small air gap to compensate for any mains DC…

LL2741: Lundahl Mains Transformer

LL2741 is a C-core mains transformer with 3 secondary windings. The core is assembled with a small air gap to compensate for any mains imbalance. The…

LL2748: Lundahl Mains Transformer

LL2748 is a C-core mains transformer. A valve amp power transformer. The core is assembled with a small air gap to compensate for any mains imbalance…

LL2749: Lundahl Mains Transformer

The LL2749 C-core mains transformer has four secondary windings of 20V, 2A. The core is assembled with a small air gap to compensate for any mains DC…

LL2758: Lundahl Mains Transformer

Lundahl's LL2758 is a C-core mains transformer assembled with a small core air gap to compensate for any mains DC unbalance. The estimated power…

LL2760: Lundahl Mains Transformer

LL1665 is a C-core mains transformer. The core is assembled with a small air gap to compensate for any mains imbalance. The estimated power rating is…

LL2792: Lundahl Mains Transformer

LL2792 is a C-core mains transformer designed for a 300B Stereo Singel-ended amplfier. The core is assembled with a small air gap to compensate for…

Lundahl Mains Transformers

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