Audio Detail 211 Mono Blocks


The new 211 mono blocks are a new design from Mark Manwaring-White of Audio Detail. The design was aimed at the audiophile market place, specifically for those who love the Single Ended valve sound, manufactured by hand using point to point style assembly, in Great Malvern, England. The Amplifier is based around the superb KR Audio “211”, directly heated Triode. 

The driver choice is the well known and venerable 807 valve, used originally for both Audio and Transmitting purposes, from the late 1930's. A large batch of 1940's Mullard 807's were actually located and purchased for this project. The pre-amplification and voltage gain stages are handled by the iconic 6J5 triodes, rather than a single 6SN7, to improve sonics. The mains and output transformers are not “off the shelf”, but wound in the UK specifically for these amplifiers. There is no global feedback within the amplifier design, to help with the natural feeling of space and imaging within the sound field.

With separate power supplies for the output stage and input/driver stages, DC heaters throughout, this is a serious low noise amplifier.

The chassis design incorporates two isolated floating sub chassis, for both PSU and amplification, helping to isolate the valves from external vibration(a mechanical form of feedback).


With an output power of 20 watts into 6 Ohms, there is more than enough for modern high sensitivity and more traditional loudspeakers.

Specifications:
  • Valve Compliment: 1 x KR 211(option for other brands) 1 x Mullard NOS 807
  • 2 x Philips NOS 6J5
  • 1 x CV717 Rectifier,(5U4G, 274B all suitable)
  • Output power: 20 Watts into 6 Ohms(other tappings available on request)