Thursday, November 12, 2009

Drawing up a component layout from a tube amp schematic

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I'm building up a low wattage tube practice amp roughly based on an old Gregory Gemini 700 / Mark 5. Since the circuit is pretty simple...
12 comments:
Monday, November 2, 2009

Low Wattage Tube Practice Amp - Plywood Mockup

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I've been working out a circuit for a low wattage tube practice / recording amp inspired by the Gregory Gemini 700 / Mark V . This wee...
2 comments:
Wednesday, October 21, 2009

Epiphone Valve Junior - the Gain Matrix Mod Part II

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I'm going to start describing the Valve Junior Gain Matrix Mod with the physical side of the job. There are three gain stages in the Va...
Tuesday, October 20, 2009

Champion 600 Speaker Upgrade Comparison

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I installed four different speakers in my Champion 600 and ran some frequency response sweeps for the sake of comparison.* What I saw in...
15 comments:
Monday, August 3, 2009

Epiphone Valve Junior - the Gain Matrix Mod

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Here's a gain reduction mod I recently completed on an Epiphone Valve Junior. The owner was looking for less volume and less gain. Thi...
3 comments:
Sunday, July 26, 2009

How to fit a Weber alnico speaker into a Champion 600 with a JJ 6V6

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The original owner of this Champion 600 decided to move to a larger amp . I'd put so much time into the mods that I decided to buy it f...
3 comments:
Friday, July 24, 2009

Where is the dangerous voltage in a tube amp?

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"UNPLUG YOUR AMPLIFIER AND DISCHARGE THE FILTER CAPS BEFORE YOU START WORK INSIDE A TUBE AMPLIFIER. THERE ARE LETHAL VOLTAGES INSIDE TH...