• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Current OPT makers

I would definitely recommend this guy! https://www.thermioniclab.com/
Very good quality transformers from a very knowledgeable guy! Highly recommended from me as I have used a lot of his opts and chokes. Also, he can listen to your very specific needs and design customisations and last but not least all done with excellent craftsmanship and very low prices. His personal e-mail is info@thermioniclab.com
 
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