The Amplimo XA261 Power Transformer Tube Amplifier 121 VA is a toroidal power transformer for valve amplifiers, featuring dual 115 V primaries and multiple secondary windings including 300 V, 6.3 V, 10 V and 20 V outputs.
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Amplimo XA261 Power Transformer Tube Amplifier 121 VA Toroidal Power Transformer for Valve Amplifiers with 2 x 115 V Primary and 300 V, 6.3 V, 10 V and 20 V Secondaries
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The Amplimo XA261 is built for valve-amplifier power stages where multiple isolated secondary voltages are required from one compact toroidal transformer. Its 300 V secondary delivers 310 mA for high-voltage supply needs, while the 6.3 V winding provides 4 A for heater circuits. Additional 10 V and 20 V windings, each rated at 100 mA, support auxiliary circuits in suitable amplifiers.
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The transformer uses two 115 V primary windings. These can be connected in series for 230 V mains operation or in parallel for 115 V mains operation, making the XA261 suitable for different mains environments when wired correctly. All listed voltages are specified under full ohmic load, with 8% regulation.
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With a diameter of 98 mm and a height of 48 mm, the XA261 offers a practical form factor for chassis-mounted tube amplifier designs and related amplifier accessories. The transformer weighs 1.4 kg without mounting materials, and all leads are approximately 200 mm long for flexible internal wiring.
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Mounting hardware is included: one 70 mm metal washer, two 70 mm neoprene washers and an M5 x 55 bolt with nut. The transformer is manufactured and tested according to EN61558 and is suitable for 50 Hz and 60 Hz operation. Time-lag fuses are required on the primary side, with 1.2 A for 115 V mains and 0.63 A for 230 V mains, and each secondary winding requires additional protection in the final power supplies design.
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