AudioChainsDB
Fosi Audio

T20

amplifier

$90

Used market: $65*

Manufacturer datasheet

Specifications

3 of 6 values have a recorded source
Amp Type
Integrated Stereo Amp·
Channels
2·
Speaker Outputs
·
Power Output Per Channel
{"thdPercent":0.04,"continuousWatts":50,"loadImpedance_ohms":4}✓
Min Supported Impedance ohms
2✓
Updated At
2026-08-05T21:42:39.742Z·

Expert Audio Engineering Commentary

Headroom Notes

A TPA3116 class-D output stage with two 5725 tubes in the input stage - the tubes shape the signal, they do not amplify it into the speakers. The power figure is stated as RMS with band and distortion attached, which is unusual at this price: 50 W RMS x 2 into 4 ohms, 20 Hz - 20 kHz, 0.04 % THD. The headphone jack is specified for 16 - 64 ohms only, which rules out most 250-ohm studio headphones.

* Estimated with the depreciation fallback (~72% retained value). · checked on 8/5/2026