Lundahl Mains transformer, LL1683

Mains Transformers for Tube Amplifiers LL1683

C-core mains transformer. The core is assembled with a small air-gap to compensate for any mains DC-unbalance. Estimated power rating 120 VA, which can be increased with good cooling. The 2 x 250V secondaries are internally divided between the two coils. As a result, the transformer can be used with bridge or full wave rectifiers without a problem of asymmetric load. Magnetic stray is extremely small if filament secondaries of the two coils are loaded identically

Weight 1.4 kg

No load output voltage, max recommended transformer current (rms) and coil resistance with primary connected to 230 V series / 115V parallel

Primary res. Serial/parallel: 7.5 W / 1.9 W
Sec 1 (Pins 15 22): 250V / 80mA 100 W
Sec 2 (Pins 24 17): 250V / 80mA 100 W
Sec 3 (Pins 26 19): 48V / 0.1A 40 W
Sec 4 (Pins B7 B4): 6.6 V / 3A 0.2 W
Sec 5 (Pins B6 B1): 6.6 V / 3A 0.2 W
Sec 6 (Pins B3 B8): 5.2 V / 3A 0.2 W
Sec 7 (Pins B2 B5): 5.2 V/ 3A 0.2 W

Please note! Output current from rectifier: 63% of above with cap. input rectifier, 95% of above with choke input rectifier.