Now, we get it — some readers are going to find it hard to invest an hour in watching [jdflyback] make a pair of triodes to build his amplifier ... may have seen other homemade vacuum tubes ...

Make a portable audio simple amplifier. Homemade amplifier for speakers Russia and Ukraine swap hundreds of prisoners in one of the war's largest exchanges Ted Lasso recasts actor for key role in ...

Want to make your own air knife to cut things with ... it turns out that these are generally called an air amplifier, such as those from Exair and are often used for cooling and ventilation ...