TH Black Eye (Soldano GTO) prototype build

[Betty Wont]

It does act a lot like the Hyperion 2 ground lift oscillation.

 

[Dan0h]

Any suggestions how to fix this? Should I run some grounds to the enclosure like in and amp? Or connect the in and out grounds together? Maybe run hounds from the power jack to the In/out grounds?

 

[music6000]

Newest one

Are you having issues with your 2 Builds ????

 

[music6000]

Any suggestions how to fix this? Should I run some grounds to the enclosure like in and amp? Or connect the in and out grounds together? Maybe run hounds from the power jack to the In/out grounds?

Have you tried lifting one of the grounds from the Input/ Output jack ????

 

[Betty Wont]

Any suggestions how to fix this? Should I run some grounds to the enclosure like in and amp? Or connect the in and out grounds together? Maybe run hounds from the power jack to the In/out grounds?

I think we need to audio probe and see where the oscillation starts. But seriously, I'm not probing this guy.

 

[Betty Wont]

Have you tried lifting one of the grounds from the Input/ output jack ????

I have. No dice.

 

[jubal81]

I have. No dice.

 

[jubal81]

Only quick fix I can think of is try some 220pF caps from grid to anode to kill that super high end.

 

[Betty Wont]

Only quick fix I can think of is try some 220pF caps from grid to anode to kill that super high end.

It's not a high squeal. It's a tunable full frequency oscillation.

 

[Bricksnbeatles]

It's not a high squeal. It's a tunable full frequency oscillation.

Hook the pot up to a string on a slider, and enjoy your new ondes martenot?

 

[music6000]

It's not a high squeal. It's a tunable full frequency oscillation.

Have you tried a Buffered pedal in front of it????

 

[Dan0h]

Have you tried a Buffered pedal in front of it????

Holy that solved it!

 

[Dan0h]

I put the Black Eye “AFTER” my General Tso as it has a BP, and Whala! No squeal full blast vol or gain. Sweet. Now I need to built a tiny Bp to stick in front of this beast because I don’t want it after my General Tso. Thank you @music6000

 

[music6000]

I never have oscillation issues as I always have buffered pedals amongst my true bypass pedals!
It will be a Trace within the PCB sitting too close to another Trace!
This is High Gain so it is more prone to squeal in a confined space!!!

 

[Betty Wont]

Have you tried a Buffered pedal in front of it????

That doesn't do anything for me. Its self oscillating.

 

[music6000]

That doesn't do anything for me. Its self oscillating.

Check your Resistor values to & make sure you you got the 4th Multiplier Band right ??????

 

[Dan0h]

I never have oscillation issues as I always have buffered pedals amongst my true bypass pedals!
It will be a Trace within the PCB sitting too close to another Trace!
This is High Gain so it is more prone to squeal in a confined space!!!

If the traces are too close why does the buffer correct it on my build? Just lowering the impedance is the trick?

 

[Betty Wont]

Check your Resistor values to & make sure you you got the 4th Multiplier Band right ??????

Yes, well beyond the basic troubleshooting, up to high voltage probing.

 

[Betty Wont]

I put the Black Eye “AFTER” my General Tso as it has a BP, and Whala! No squeal full blast vol or gain. Sweet. Now I need to built a tiny Bp to stick in front of this beast because I don’t want it after my General Tso. Thank you @music6000

If this is the solution, then the pedal was designed to never be used alone without a buffered pedal before it?! That isn't logical. Or it would have the onboard circuitry to function on it's own.

 

[Bricksnbeatles]

Haven’t built mine yet, but I’m curious— of everyone who has built it so far, who’s had this oscillation issue? I feel like I’ve seen of 20 or so people who have mentioned building it, but only five people seem to be reporting this issue. Can we track down what variables are at play here? The 250v vs 400v cap? Tube brand? Source of 555 and/or mosfet for the power section? Wire gauge used?

The people having the issue are no slouches when it comes to building, so building errors can safely be ruled out. I feel like there’s gotta be a common thread between either all of the builds with the issue or all of the builds without the issue.