The Amplimo 3N604 Power Transformer Tube Amplifier 67 VA is a toroidal power transformer for valve amplifier projects, featuring dual 115 V primaries and 250 V, 6.3 V and 30 V secondary windings.
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Amplimo 3N604 Power Transformer Tube Amplifier 67 VA toroidal power transformer for valve amplifiers with 250 V, 6.3 V and 30 V secondaries
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The Amplimo 3N604 is designed as a toroidal power transformer for valve amplifier builds. It provides two 115 V primary windings, allowing operation on 115 V mains with the primaries connected in parallel or on 230 V mains with the primaries connected in series. This makes it a practical choice for suitable amplifiers that require a dedicated tube amplifier transformer.
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The secondary side offers three outputs for typical valve amplifier power requirements: 250 V at 200 mA, 6.3 V at 2.2 A and 30 V at 0.1 A. All voltages are specified under full ohmic load, with 10% regulation. For builders selecting power supplies and related transformer hardware, these clearly defined secondary ratings help simplify integration.
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With a diameter of 95 mm, a height of 36 mm and a weight of 0.95 kg, the 3N604 is compact while still providing a 67 VA rating. All leads are solid and approximately 200 mm long, giving enough length for neat internal wiring in compatible chassis layouts and DIY audio components.
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The transformer is supplied with mounting materials: one 70 mm metal washer, two 70 mm neoprene washers and one M5x50 bolt with nut. It carries KEMA KEUR, ENEC, CE and UL/CSA approvals. Time-lag fuses are required, with 0.8 A 5x20 mm IEC127 high I²t for 115 V primary operation and 0.4 A 5x20 mm IEC127 high I²t for 230 V primary operation. Additional protection is required for each secondary, making it important to complete the installation with suitable amplifier accessories and protection components.
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