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EC-300B 10W Single-Ended Non-NFB Stereo Power Amplifier

Single-Ended Non-NFB Stereo Power Amplifier

The legendary 300B power triode has long been the first choice of many serious music listeners because of the natural, emotional presentation of amplifiers using this power tube. The 300B tube works very well in traditional circuits and this is part of the reason why this ancient triode has become so famous worldwide. We appreciate the achievements of old-fashioned single- ended 300B amplifiers, but the dream of the full potential of 300B for musical reproduction has only come true with the creation of the EC-300B amplifier.
In the EC-300B, 300B tube is special adaptation of our proprietary IITC interstage transformer coupling circuit. Our design is carefully tailored to furnish ideal drive conditions for the output tube, opening the door to dramatic new levels of low-end articulation and dynamic excitement for single-ended 300B amplifiers. The ample 10 watt output of the EC-300B provides full-bodied musical reproduction that you will appreciate for a long, long time.
The result of our intensive research, the EC-300B, is a completely modern amplifier dedicated to the timeless quest for musical enjoyment.
Category: .


Power Tube 300B
Effective Power output 10 watts per channel
Frequency range 20Hz-100KHz
Input sensitivity 1.0Vrms
Input impedance 100k ohms
S/N ratio 80dB
Power consumption 260 watts
Power supply 100,110,120,220,230,240
VAC 50-60Hz
(selected when shipped)
Load impedance 8(4/16) ohms
External dimensions 485Wx350Dx220H(mm)
Weight 27kg


  • An Adaptation of IITC circuit concept featuring a unique configuration which cancels DC magnetization in the interstage transformer for outstanding bass performance and rich musical reproduction.
  • All direct-coupled circuitry. We avoid coupling capacitors to ensure maximum purity of reproduction.
  • The 300B heaters are supplied from a well filtered DC source to minimize hum and noise.
  • The 10mm thick chassis is NC machined from solid aluminum and finished in a satiny champagne-gold finish.
  • The specially-designed transformers used in WAVAC Audio Lab. amplifiers are custom-wound to the highest standards by TANGO, the most renowned transformer manufacturer in Japan.
  • All tube sockets are machined out of solid Teflon, fitted with gold plated phosphor bronze contacts and mounted on elastomeric vibration insulators.
  • Gold-plated speaker jacks which will accommodate heavy audiophile speaker cables are mounted on the top of the amplifier for easy access.
  • Reduction of noise caused by electric power supply is realized by a power line input filter.
  • A perforated aluminum bottom plate provides effective cooling for long component life.
  • An attractive laboratory glass canopy suspended on elastomer supports is provided the output tubes.
  • The input tube is a triode-wired Western Electric 435A, a superb small-signal device designed to meet the highest standards of performance and reliability in vital telecommunication applications.