Here is a slide show of the history of guitar amp attenuation
and highlights some of the similarities of the overall design, UA excepted.
When you click the link, it will download a Powerpoint document. When you open it either press the F5 key to play or click slideshow in the toolbar and click play. To stop, [...]
There has been a lot of lively discussion on TGP and the Vintage amp Forum about the safety of mismatched loads and in particular, of the 30 ohm load in the UA. Here is a response I made to a customer that I will reprint here.
There are two serious considerations for load devices like the [...]
The UA has a protect circuit that must be switched on by passing a signal through the unit. This is simply accomplished by turning on the amp and turning it and the guitar up enough to open the circuit. The circuit was included to protect parts in the UA vulnerable to the voltages it would [...]
Hello and welcome to my Blog. My name is Mark Gregg and this is Stupid Amp Tricks or sit, stay, good boy! These should be loose, fast and devoid of spell check. Basically it’s about how to get the most out of your amps and UA and the experience I’ve gained blowing up my own [...]