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Old 27th February 2005, 03:46 PM   #1
jim is offline jim  Belgium
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Default tube distortion effect.


I'd like to build something like this :
An all tube distortion unit : Culture Vulture and another article with more info on the tubes used : Culture Review .

Any ideas from you guys ???

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Old 28th February 2005, 01:58 AM   #2
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Default Jim

Why not try a simple line stage to add that bit of valve warmth.

As an alternative to all the usual line stage arrangements you might also like to try a cathode follower output BUT using a 6ES8 variable mu tube. Set at the right bias current this introduces SMALL amounts (because of the 100% feedback in a cathode follower) of compression on the negative going half of the signal, as current drops and mu drops with it. This introduces asymetrical distortion - almost pure 2nd Harmonic. The effect is very subtle but quite lovely. Too much distortion for you? - simply pull the 6ES8 and substitute a 6DJ8.

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Old 1st March 2005, 03:44 AM   #3
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Well, none of the tube gurus are answering, so I'll say what I would do if I were you, assuming that I understand correctly that you are looking for an actual working schematic and not design ideas.

Go to one of the many guitar amp schematic sites and find a tube amp with a 3 stage front end (ignore the power tubes) with at least one pentode and that suits your fancy (I would be looking at Marshall myself). Here is your basic schematic, and you can add a switch to strap/unstrap the pentode(s) to triode. Then you have your triode/pentode distortion modes.
The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts. Bertrand Russell
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Old 1st March 2005, 03:59 AM   #4
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Default depends

Depends on which 6dj8 tube one is talking about. One or two are quite good.
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Old 1st March 2005, 06:18 AM   #5
jim is offline jim  Belgium
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Location: Leopoldsburg - Belgium

The guitar-amp idea also came to my mind.
But some more ideas/opinions about tube types
that have typical distortion or circuits tips are welcome.

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Old 2nd March 2005, 12:55 AM   #6
Enzo is offline Enzo  United States
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You will also find many knowledgable people over at there are builders there at all levels with experience to draw from.
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Old 2nd March 2005, 02:09 AM   #7
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Here's a neat little tube FX box..
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Old 5th March 2005, 07:57 AM   #8
t'audio is offline t'audio  Canada
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Location: Ontario
Default London Power Guitar Preamp

You should also check out the "London Power" preamp.

You can get the schemetic here

More info at (where you can also get a kit).

I've built two of these and they sound good ...
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