Action A50Taurus

50W Integrated Stereo Tube Amplifier

Three models of stereo tube amplifiers with DAC's on board, guaranteeing exceptional sonic performance from any digital source. Made with the finest materials & advanced technology, this series is a sophisticated blend of research & experience. Designed without compromise for a rich sound & faithful music reproduction.

The A50Taurus provides a minimum of 100 watts (50W per channel), power output from 4, KT88/6550's in Ultra-Linear (UL) - push/pull operation.

The A50Taurus like it's bigger brother also features a newly designed custom output transformer resulting in a rich sound stage but with an authority that belies its 50W.


  • USB & S/PDIF input
    For the first time we include an onboard 24Bit 192KHz Wolfson DAC for a extraordinary listening experience. 
  • DC Powered tube heater
    All tubes, except KT88/6550, have DC stabilised heater circuits to reduce hum noise to a near in-audible minimum. 
  • Output transformer
    The Output transformer uses a Hi-Grade Iron-Silicon for superb frequency reproduction & width. With this newly designed custom output transformer unique to the A50Taurus we are able to achieving a highly delicate & precise sound reproduction faithful to the original recording. 
  • Mechanical chassis construction
    The power supply & output transformers are held by an extremely rigid "H" structure that keeps the unit free from unwanted vibrations which further helps reduce unwanted noise to the tubes. 
  • Remote control
    Featuring a superb CNC machined case it has a soft button design, perfectly matching the aesthetics for the "ACTION" series. 
  • Feet
    Four CNC machined aluminium feet with an insert of natural rubber. The depth & form of these rubber feet has been calculated to minimise vibrations of the amplifier in isolation from its surroundings. 
  • Binding posts
    Gold plated professional binding posts for a continued oxidisation free connection further improve sound refinement.
  • Sockets
    Gold plated ceramic sockets for a continued oxidisation free connection further improve sound refinement. 
  • Components
    Components for the A50Taurus have been selected with great care throughout. Only the best available components are considered & all must undergo an exhaustive analysis of their sonic influence prior to final selection. 
  • Selected tubes
    All tubes used are selected after 2 stage warm up. A fully computer monitored machine controls the process & at the end of this, selects the perfect tubes which are then matched for a perfect balance.


Power stage (1 ch.)

2 X KT88

Input stage (1 ch.)

1 X 12AX7/ECC83

Driver stage (1 ch.)

1 X 12BH7

Input impedance

75 Ohm (S/PDIF)

Input sensitivity

150mV RMS

Output tap

6 Ohm


Push-Pull Ultra linear 43% tap

Power output (1 ch. THD < 1%)

50W RMS @ 6Ohm

Frequency response

from 20Hz to 20KHz ± 0.5dB


1% @ 1KHz (Max Power)

S/N ratio

>90dB “A” weighted


4 line inputs
1 S/PDIF input
1 USB input

D/A Converter

2 X WM8740, dual mono configuration, 192KHz oversampling

S/PDIF format

PCM 32-192KHz, 16-24 bit

USB interface

PCM 16bit 48KHz, standard audio device, no driver required


Pre out (variable level)

Bias setting

Manual adjustment, independent for each power tube

Dimensions (w,d,h)




Line power

117, 230, 245 Vac 50/60 Hz (see rear label)


See rear label

Power consumption

350W Max

Remote control


Anodized black aluminium

Transmission type





Volume, mute, input selection, st-by


2 x CR2032