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Old 7th March 2004, 02:55 PM   #1
guitargully is offline guitargully  United States
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Join Date: Nov 2003
Location: Detriot, MI
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Default Tube Effects

Hey everyone,
Yesterday I got a tube distortion box from my friend to borrow for a while, well.. it wasnt working and i told him i'd fix it.. so i took it home, found a few loose wires.. etc. and fixed it. I really like the sound of it- it has a nice warm distortion sound with alot of tone, somthing i cant get with the SS effects in my Crate head. Anyone know of some designs i could use to make one? I'd like to use an off-the-shelf transformer.. and no chips.. there's an easy looking design on www.generalguitargadgets.com , but it uses a JRC4558 chip.. i have the feeling that does more work than the tube. The one on that sight uses a regular old 12V transformer.. so it would be nice if i could use somthing similar. Thanks.
say what? .. be careful with your ears.
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Old 8th March 2004, 12:19 PM   #2
Centauri is offline Centauri  Australia
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Join Date: Jul 2003
Location: Newcastle, Australia
I assume you are referring to the "tube driver" project. This is nearly identical to the Dean Markley "Overlord" pedal, and this sounds very good. The op-amp is only used as a convenient way of increasing the signal level to the tube - the tube does all the overdrive work. It would be possible to replace the chip with another 12AX7, however it becomes more difficult to fit it in a small space.

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