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  1. #1
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    Default Valve amp project

    Earlier this year my nephew was after a valve guitar amp and after picking up a box of 6CM5 valves fairly cheaply, I had a look round on the 'net for amp projects based around these valves and found: ECONOMICAL VALVE BASED AUDIO POWER AMPLIFIER and Grant Wills

    I built a stereo version of the first amplifier fairly cheaply, probably well under $200 as I had most of the parts lying around already. It was fairly straight forward to make and after letting a few guitar players try it out the general consensus was that it was no good as a guitar amp: it sounded "too clean" and "no distortion there" which made sense as I built it with a fairly stiff power supply with plenty of 47 microfarad 400 volt electrolytics. I also used a 20 Watt PA transformer instead of the 15 Watt unit for the later guitar amp which should extend the ful power bandwidth a bit.

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  3. #2
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    Default

    Nice. I bet you could get it to distort too - just need to plug a lot of gain into the front end...
    The other day I described to my daughter how to find something in the garage by saying "It's right near my big saw". A few minutes later she came back to ask: "Do you mean the black one, the green one, or the blue one?".

  4. #3
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    Default

    Quote Originally Posted by petersemple View Post
    Nice. I bet you could get it to distort too - just need to plug a lot of gain into the front end...
    I do have to play around with the guitar amp version a bit to get some distortion happening, might try a cascode stage input and go from there.

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