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ST-70 & AB, ultimate ST-70 upgrade kit, auto bias |
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ST-70 & AB, ultimate ST-70 upgrade kit, auto bias PC-3 driver - ECF82, 6GH8 |
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Power driver + autobias for PP four triodes or pentodes !! It will be on sale for a month !! |
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RIAA Phono Preamplifier for magnetic phono cartridge
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3 Band Preamplifier - Double Bass, Bass, Treble
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Driver for Dynaco ST-70 including module AB for autobias |
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Autonomous automatic control bias system ABF-Q without bias source |
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Auto bias module specially for amplifier DYNACO ST-70, ST-120 !! It will be on sale for a month !! |
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Auto bias module specially for amplifier DYNACO M125 !! It will be on sale for a month !! |
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Auto bias module ABS-Q+ !! It will be on sale for a month !! |
Tube auto bias control
Technology seamlessly integrated into the tube amp.
It will measure the current flowing through each power tube several times a second and will automatically make any necessary bias adjustment . This means the power tubes will always have an optimum bias over their entire lifespan . It will assure a consistent sound quality, trouble free usage and no need for any manual adjustments ever again.
Replacing the power tubes is a breeze as well. Plug in a new batch of tubes, disconnect the input, turn the amp on and let it sit for 5 minutes. That’s it. No special tools or devices required. Spot on bias setting every time.
Besides the obvious benefits of never having to worry about the bias, the same technology will also notify you if a tube is at the end of its lifespan and needs to be replaced. It will detect faults like a defective tube or problems with the bias voltage itself. If any of these errors threaten proper operation, the amplifier will go into protection mode to prevent any possible catastrophic damage.
Using tube amps just got a whole lot simpler.
Discover our latest solutions for output stages of tube amplifiers !
This website focuses on tube amplifier solution using modern elements. Special attention is paid to amplifiers output stages- their setting and control, output transformers, power supply units and another amplifier parts.
The information is based on many years of experience in construction and measuring of tube amplifiers, development of modules for tube stage control & quality output transformers . 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 control so that you can completely avoid repeated re-setting of output stages resulting from tubes aging and at the same time guarantee optimum conditions for the permanent operation of your tube amplifier.
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.
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.
Serial production
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