The Amplimo 20PP8K0S is a wide bandwidth toroidal tube output transformer for push-pull amplifier designs, offering 20 W nominal power, an 8 kΩ primary, 0-4-8 Ω secondary taps, and 35% ultralinear taps in a compact 85 mm x 40 mm package.
Amplimo 20PP8K0S Wide bandwidth toroidal tube output transformer 20 W 8 kΩ
The Amplimo 20PP8K0S is designed for tube amplifiers that require a push-pull output transformer with an 8000 Ω primary impedance. As one of the key audio components in the output stage, it provides secondary connections for 0, 4 Ω, and 8 Ω loudspeaker loads.
With a nominal power rating of 20 W, this toroidal transformer combines a compact form factor with wide frequency performance. Its -3 dB bandwidth reaches from 7 Hz to 80 kHz at 1 mW, while the power bandwidth starts at 35 Hz, supporting stable wideband operation in suitable tube amplifier designs.
The transformer includes 35% ultralinear taps and specified turns ratios of 44.8 for 4 Ω and 31.5 for 8 Ω operation. Use only one secondary tap at a time, selecting either the 4 Ω or 8 Ω output connection according to the connected speaker load.
Electrical construction details include 1220 H primary inductance, 18 mH primary leakage inductance, 390 pF primary capacitance, and 152 Ω primary DC resistance. The secondary DC resistance is 145 mΩ at 4 Ω and 250 mΩ at 8 Ω. Installation is supported by toroidal clamp and washer mounting hardware, with overall dimensions of 85 mm outside diameter by 40 mm height.
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