The latest in the series of Conrad-Johnson vacuum-tube power amplifiers, the LP125sa is announced for release in Conrad Johnson LP-125sathe UK by Audiofreaks distribution. The high-end amplifier is a single stereo block and, at 125 watts per channel has ample power for the majority of high-end loudspeakers.

The LP125sa audio circuit consists of three stages. The input signal is amplified by a single-ended triode amplifier, the signal is then direct coupled to a cathode coupled phase-inverter and this high current, triode phase-inverter stage provides a balanced, low impedance drive to the output stage which is provided by two pairs of KT120s per channel.

The LP125sa boasts massive transformers and a small amount of loop negative feedback reduces distortion and achieves a reasonably high damping factor.

The power supplu in the LP125sa is a separate, low impedance, discrete dc affair and regulators are provided for the input and phase-inverter stages, “preventing the output stage from modulating these stages through the power supply”.

A built in bias meter allows for simple biasing of the valves.

The amplifier is available in a standard configuration for just shy of £8000 and a “plus” version with upgraded caps and resistors comes in at a fiver short of £10000.

 

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