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:
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.
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.