The Amplimo 4N605 Power Transformer Tube Amplifier 100 VA is a toroidal power transformer for tube and valve amplifier builds, with dual 115 V primaries and 290 V, 6.3 V and 40 V secondary outputs.

Highlights of the Amplimo 4N605

Toroidal power transformer for valve amplifier applications
Dual 115 V primaries for 115 V parallel or 230 V series operation
Secondary outputs: 290 V at 250 mA, 6.3 V at 3.8 A and 40 V at 100 mA
Compact 92 mm diameter and 49 mm height, with 1.4 kg weight excluding mounting materials
Supplied with mounting hardware and approximately 200 mm solid leads

Product details Amplimo 4N605

Amplimo 4N605 Power Transformer Tube Amplifier 100 VA Toroidal power transformer for valve amplifiers with 290 V, 6.3 V and 40 V secondaries

The Amplimo 4N605 is designed for valve amplifiers that require a dedicated high-voltage supply alongside heater and auxiliary windings. Its two 115 V primary windings can be connected in series for 230 V operation or in parallel for 115 V operation, making the transformer suitable for different mains configurations.

The secondary side provides 290 V at 250 mA, 6.3 V at 3.8 A and 40 V at 100 mA. These outputs make the 4N605 a practical core for amplifier power supplies where separate high-voltage, filament and auxiliary rails are needed. All voltages are under full ohmic load, with 8% regulation.

The toroidal construction keeps the transformer compact, with a diameter of 92 mm and a height of 49 mm. It weighs 1.4 kg without mounting materials and is supplied with mounting hardware: one 70 mm metal washer, two 70 mm neoprene washers and an M5 x 55 bolt with nut. All leads are solid and approximately 200 mm long for straightforward integration into a chassis.

The 4N605 carries KEMA KEUR, ENEC, CE and UL/CSA approvals, with KEMA certificate 96 2307 and UL file number E179800. Time-lag fuses are to be used: 1.25 A for 115 V mains, 0.63 A for 230 V mains, and secondary fusing of 0.25 A, 4 A and 0.16 A for the 290 V, 6.3 V and 40 V outputs respectively.