Gratitude and tubescreamer question C5 jumper question

[tomnottom]

First I want to say how cool this community is. Every question I have posted has been answered and even with my rudimentary electronic experience someone has walked me through in a paint by numbers way( I promise I am trying to learn to read a schematic). Question I read an Aron Nelson tubescreamer mod that jumperd C5 and just wondered what this would do? Thanks Tom

[ianmgull]

Different schematics sometimes use different component labels (ie C3 C5). Post a schematic and you'll get a quicker reply. 

[MikeH]

Or post a link to the mod.

[ianmgull]

Ok. I think you're referring to the GGG version. There is a PDF with a list of different mods, one of which is Aron Nelson's mods. If so this is what I can tell you:

Jumpering C5 raises the cutoff frequency of the lowpass filter formed in conjunction with R8. I'm not entirely sure what the purpose of this filter is as it's leading into the tonestack. Hopefully somebody more knowledgeable than I can help you there.

If you haven't already check out "The Technology of the Tube Screamer" at Geofx. It tells you what just about every component does in the tubescreamer.

Good luck!

[MikeH]

There's some inconsistency with the GGG files.  On the schematic C5 it a .22uf tant going to ground between the gain stages.  Jumpering that would ground the signal path and cause nonworkitis.  But the 'modifications' section does say to jumper C5.  Weird- it doesn't look right to me.

It could be that arons mod refers to a different schem and they just posted what he wrote somewhere, not cross referencing it against their own schematic?

[tomnottom]

Thanks, and Yes it is the GGG ITS8 I was referencing.

[MikeH]

I'd pm Aaron and ask him which cap it is; C5 on the GGG schem can't be right- <hysterics>it just can't be!</hysterics>