TL12 Plus

About the TL12 Plus

The H.J. Leak TL-12 Plus is a valve (tube) power amplifier designed to deliver high fidelity sound with a power output of 12 watts RMS, suitable for home use and professional broadcast monitoring. It features a 3-stage triple loop feedback circuit providing 26dB of negative voltage feedback, which ensures low distortion and high stability. The amplifier uses a push-pull triode output stage with two EL84 valves, an ECC81 for the second stage, an EF86 for the first stage, and a GZ34 rectifier valve. It has a total harmonic distortion of 0.1% at 12 watts output and a frequency response of ±0.5dB from 20Hz to 20kHz. The input sensitivity is 125mV at 1kHz for full power output, with an input impedance of 1 megohm plus approximately 5pF. The amplifier is finished in beige-gold stoved paint with black fittings and is known for its reliability and craftsmanship, having been used in high-humidity and high-temperature environments. It supports loudspeaker impedances from 3 to 20 ohms with selectable output transformer taps. The TL-12 Plus is appreciated for its natural harmonic sound and has been used in professional and audiophile settings since its release.