Tyrian distortion squeeling

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If it squeals all the time there is a problem somewhere in the build. So please provide a bit more detail about when it squeals, whether it is only when the gain is above half, etc.
 
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How hot is the signal going into your effect? Does it stop if you back off the guitar volume instead of turning down the gain on the pedal? I don't know the pedal so others may know if this is way out of bounds for the way it is supposed to work.
 
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zgrav said:
How hot is the signal going into your effect? Does it stop if you back off the guitar volume instead of turning down the gain on the pedal? I don't know the pedal so others may know if this is way out of bounds for the way it is supposed to work.
Click to expand...
What happens if your Guitar is facing away from Amplifier, This is a High Gain pedal & are prone to Feedback if you are facing the Speaker.
 
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Can you post a pic of your build? A couple other folks have mentioned a similar problem, but quite a few people have built them with no issues.
(I have personally built two of these with no oscillations whatsoever)

I'm wondering if it might be a particular component construction type that is causing the issue....
 
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temol said:
Did you use shielded IN/OUT wires for your build? For many hi-gain circuits it's a must.

T.
Click to expand...

Here's the deal, the Brown Betty I built also squealed but after increasing one of the ceramic caps, the 47pF one I think, it was far more controllable. I thought that maybe increasing one of the 100pF caps here might help.
 
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I'd start with new wires ;)

IN jack -> 3pdt -> board IN
board OUT -> 3pdt -> OUT jack

But wait..try this - bypass 3pdt completley. Connect input jack directly to the board, same with the output jack.
Use shielded wire, at least for the input jack.

T.
 
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I didn't use shielded wires either (it's certainly not a bad idea), but I would definitely try separating those In/Out wires as far apart as possible so they aren't overlapping each other.

Everything else looks fairly standard (although I didn't use green mylars for the 4n7 caps)... It may not have any relevance, but some of the pins of your TL074s are awfully close to the adjacent socket contacts because of how they are shifted. Did I ship you dual/quad adapters with this? It might be worth giving them a shot.

Does lowering the Volume make it stop oscillating?
 
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Robert said:
I didn't use shielded wires either (it's certainly not a bad idea), but I would definitely try separating those In/Out wires as far apart as possible so they aren't overlapping each other.

Everything else looks fairly standard (although I didn't use green mylars for the 4n7 caps)... It may not have any relevance, but some of the pins of your TL074s are awfully close to the adjacent socket contacts because of how they are shifted. Did I ship you dual/quad adapters with this? It might be worth giving them a shot.

Does lowering the Volume make it stop oscillating?
Click to expand...

You didnt bet never mind that, besides from what I read on forums it doesnt help. If anything I should try to solder one TL074.

Lowering the far below unity works.
 
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