A fully isolated transformer is absolutely essential as any hazardous voltages can be contained within the circuitry without coming into contact with the input and chassis. The critical part is the isolation between the mains input and the rest of the circuit. I have been building valve amplifiers for many years and studied the circuit diagram in detail. Please stop with all the negative comments, I am fully aware of all the issues this amp contains. In addition, this amp will eventually be placed in a cabinet. I built this out of the supplies that I had available. The power supply does not contain a power transformer because I did not have one readily on hand. These complaints also focus on poor design of the power supply section. I fully agree, this amp does pose a safety hazard to people without an adequate knowledge of electronics. Good luck building!ĭisclaimer: This project deals with potentially lethal high voltage, build at your own risk.Įdit: I have been getting many complaints in the comments section regarding the safety of this amp section. Make sure to vote for me in the Amp and Circuits contests. This instructable does not show how to make a cabinet, but I'll save that instructable for a later day. If it works, then plug in your guitar, iPod, or banjo, and start playing your music really loud. ![]() After your amp is done, its time to test! Hook up the amp to an isolated variac transformer and steadily raise the voltage, just to make sure nothing shorts or starts smoking.
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