In this project for audioXpress magazine, Jan Didden offers a modern update on his original high-voltage delay design, which he built to complement tube amplifiers. His original project, "High-Voltage Delay for Tube Amplifiers" was published in 2014 (click here if you want to read it) and worked fine, but it had two disadvantages: it needed a separate 6.3V heater winding for power, and was limited to a selection of just two delay periods. So, Jan decided to redo this unit with no additional outside power required, and the ability to set the delay between 20 seconds and 254 seconds, which should cover all requirements. The article describes the complete project, and there's a DIY kit available at diyaudio.com.
The kit for this project consists of the PCB, the programmed controller chip, the two power MOSFETs and the low current LED. You can order it at:
https://diyaudiostore.com/collections/kits.
You can download the project article here.
This article was originally published in audioXpress, November 2019.
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You Can DIY! A High-Voltage Delay for Tube Amplifiers - The Sequel
October 9 2019, 02:15
In this project for audioXpress magazine, Jan Didden offers a modern update on his original 2014 high-voltage delay design, which he built to complement tube amplifiers. The new unit needs no additional outside power, and allows setting the delay between 20 seconds and 254 seconds, which should cover all requirements. The article describes the complete project, and there's a DIY kit available at diyaudio.com. This article was originally published in audioXpress, November 2019.
About Jan Didden
Jan Didden has written for audioXpress since the 1970s and he is the magazine’s Technical Editor. He is retired following a career with the Netherlands Air Force and NATO. He worked in logistics, air defense, and information technology. Retirement has provided... Read more
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