relay

Dumble ODS: 100W HRM

29 May 2010

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…]

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This is one of my preamp designs, I call it the Overdrive Extreme. It is designed to be a small pre-amp capturing the big tones of the Dumble ODS amp. The circuit is a mix of solid state (JFET) and vacuum tube. With many controls and features the tones are highly flexible.

[you know you want to read more…]

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Top Drive Preamp

April 18, 2009

This is a new preamp design I have called “Top Drive”. Top Drive is a compact tube powered preamp that is quite unique and rocking. The preamp is voiced in interesting way,  the sound is very much like a classic Vox amp. The preamp has got that great top end “jangley” character with that nice […]

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The Hood Preamp

February 21, 2009

The Hood is one of my first tube preamp designs. The Hood evolved from my medalings with low voltage 12AU7 tube stompbox designs. The Hood is a low voltage preamp that uses two 12AU7 tubes, four cascaded common cathode Class A gain stages. The Hood is essentially a big glorified stompbox/preamp which offers a lot […]

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