BE OD and Dirty Shirley squealing

[GrooveChampion]

I built the BE OD and it squealed, replaced the 120pf with a 470, still squeals but less....I think....I built the PedalPCB version of the Dirty Shirley and it squeals, tried a Klon Buffer(with a TL061) and it squeals even worse....so I guess I should change the cap from 120 to something bigger?

[Sensei Tim]

shielded input/output cables?

[GrooveChampion]

I didnt give em a try but I dont know how much they will work.

[clockman]

Hey Groove. Happy new year.
 I just ran into the same squeal situation with the Diesel VH4, tried a buffer in front as well, no good.
 I did try a shielded wire on the input only and the squeal is gone, surprised how well it worked and how easy a fix could be.
 may be worth a shot   

[GrooveChampion]

OK so heres a question: I saw the DIY shielded wire guide, can I make it with copper foil?

[Blackboarcult]

If I remember right a friend of mine who repairs basses used to roll shielded wire that way.
I cant see any reason why it shouldnt work, anyways ;-)

[Teddeeh]

Which version did you build? I have built several now with the ztx-951 trannies instead of 4148 clipping and clean as a whistle. Im considering modifying the layout for the dirty shirley (if it hasnt been done already) for the clipping change to the transistor clipping. Its worth it.

[GrooveChampion]

1N4148's, in both of them. Thing is that if I am correct the 120pf cap is the "Compensation cap" like in the RAT(correct me if I am wrong). I put a 470pf in the BEOD and it somewhat mitigated the issue, then I increased that value in the Dirty Shirley to about 680pf, no more whistling.

[Teddeeh]

Yeah man, raising the small capacitor can help compensate but as an alternative i would suggest returning the capacitor to the standard value then adding a buffer beforehand. You will retain some highs and the overall sound of it. The transistor method is only a small kodification and cut tho and completely resolves the issue without the need of a buffer. Easily available from Mouser.

[GrooveChampion]

Here's the issue with the transistors: I bought the Dirty Shirley PCB from PedalPCB, and it had the issue and it had pads for the clipping diodes, not transistors. Also, I did try a buffer before and nothing.