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Discover our latest solutions for output stages of tube amplifiers

This website focuses on tube amplifier solutions utilizing currently available parts and connections. Special attention is paid to amplifier output stages, various types of tubes, output transformers, power supply units and other amplifier parts.

The information is based on many years of experience in construction and measuring of low-frequency equipment, and development of output transformers & modules for tube stage control. Comparisons of various connection types, measurement results and recommendations for the construction of modern tube amplifiers are all to be presented here.

You can easily equip your existing tube amplifier with fully analogous circuits that enable an effortless automatic bias regulation to eventually avoid constant re-adjustments of output stages resulting from tube aging.

Fitting the module into your amplifier will have these benefits:

  • no need to constantly re-adjust tube operating points
  • significantly extended tube life
  • current regulation not influenced by the music signal
  • clear undistorted sound for a great listening experience
  • significant increase in signal clarity – extreme reduction of hum and noise level of the amplifier
  • improved bass transmission
  • no maintenance or additional setup
  • optimum utilization of tube life
  • suitable for all types of output transformers (namely toroidal transformers which require automatic control)
  • safe operation due to minimized danger of runaway tube current – even when the amplifier is left unattended
  • universal use: suitable for all connection types
  • fully analogous control: the module has no digital elements

The modules are suitable for all amplifier types (classes A, AB, or B), as well as single-acting amplifiers with A-class tubes connected in parallel.

Their use is strongly recommended in existing amplifiers with fixed bias of output tube control grids, as aging of the tubes causes the need for a constant re-adjustment of their operating points.

The connection secures an absolute symmetry of anode currents through both branches of primary winding of the output transformer. This way, saturation of the the output transformer core with DC current with subsequent signal distortion and dearease in available power is reliably avoided.

Furthermore, tube operating points need no further re-adjustments. The module constantly creates optimum conditions for the output stage, independently of tube aging and consequent changes in their parameters.

Coming soon:

We are going to focus on the construction of output transformers which may be the key to achieving perfect results utilizing only the currently available parts.

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