This is a little single ended Class A amp design from Trinity Amps called the Tramp (a play on the Fender Champ, get it?). The amp is single channel with one 12AX7 and one output tube. The amp can run 6V6, 6L6, EL34, 5881, KT66, KT66, etc for the output tube. With the variety of output tube capabilities the amp can run from 5W-12W.
With only two tubes and one channel you’d think the amp would not be very versatile but that is not the case. The Tramp has two modes Tweed and Tude. Tweed mode is a nice full clean sound. Pull the push-pull volume pot for Tude mode which produces a grittier dirtier tone, great for overdrive. Tude mod is very large sounding with a sweet singing tone. A huge range of tones are covered with just two tubes. Many great sounds to be had!
[you know you want to read more…]
After building a 50W Dumble Overdrive Special (ODS) the next logically thing was to build a louder, fancier Dumble amp. Dumble Overdrive Special’s come in two flavors, HRM and non-HRM. HRM stands for Hot Rubber Monkey (though often called Hot Rodded Marshall) and refers to a Marshall tonestack placed at the end of the Overdrive channel. This added internal trim pot based tonstack allows the player to have better control over the Overdrive channel tone.
Since the PAB disables the tonestack in the Clean channel you can see how using the PAB and the Overdrive channel simultaneously allows you to have a dedicated clean tone and rely less on the Clean channel tone. In other words you don’t have to compromise your Clean channel tone in order to get a good Overdrive channel tone and vice versa with HRM ODS’.
Though there are many similarities between the HRM ODS and the non-HRM ODS this 100W HRM build and my 50W non-HRM ODS build are quite different sounding. I enjoy the complexity, tweaking and sound of Dumble amplifiers so I decided to take on this build for these reasons. [you know you want to read more…]