Cornish TB-83 Treble Booster?

[sopapo]

The power filter cap wont have any effect on the sound whatever value it have, and the cap on the emiter of the tranny its suspicious to be 100 u, i think its not the most critical...
Nick, the cornish booster do you have, it has pot? Where is attached??

[njkmonty]

no pot

[sopapo]

Ok, thanks. I will do it with a pot. Time to figure if go by the route of a 10 k pot instead of rhe 6k8 or a 50k  pot instead of the 47 k resistor..

[rankot]

What is the value of C5?

[nickbungus]

1n

I'm also happy that the electrolytics are 100uF and 47uF.   

[sopapo]

100 uf for the power caq filter and 47 for the emiter one?

[nickbungus]

Yes.  I bought some axial ones and sizes seemed to match what I took off.  Perhaps I'd damaged the originals slightly during the removal of the epoxy.

I've got some images that need a bit if tidying (a layout and the schematic)

[sopapo]

ok, great¡¡ its look like you already have it almost nailed.
So in the end, the cap at the emitter it musnt be critical, because some post below you toll us that you try it with 100 instead of 47uf and sounded identical...

[maynut]

Hi Nick,
Sorry I was trying to understand this thread, (well done getting hold of the Cornish by the way) but, have you uncovered the components, or are these details being deduced from Covington's pedal you had before? Thanks!

[nickbungus]

Yeah I've got it.  I'll post the schematic tomorrow as it's on my work pc

[maynut]

Ooh interesting! Excellent, looking forward to this! Time to get the soldering iron out...

[nickbungus]

Here you go!!!  The most underwhelming experience after spending so much time scrapping off all the epoxy.

[maynut]

Thanks for this Nick, good work.  Believe me, your efforts have not been wasted - finally, the actual Cornish circuit for all to see.  It may not be surprising or unexpected, but we know for sure now!
Thanks!

[nickbungus]

The led clr resistor(r1) was obviously added by me and not present and the tranny was a BC549c.  I've built a few replacing the R11 with a 10k pot, wiper to c6 and it worked
really well.  I'll assume the Extra did this.

[maynut]

Excellent!
Do you have a pic of the components on the board?
No worries if not, just would be cool to have a look at Mr Cornish's work

[nickbungus]

You'll need to mirror before etching.  C7 and R10 were actually the other way round on the board



Heres a rough translation of the board.  It uses axial caps for the electrolytics. 

[maynut]

Great work Nick, thanks again for this!

[maynut]

Yes so it turns out that the link posted previously in this thread, pointing to Fryer's website, with a schematic for a "TB-83-ish" (part of the 3-in-1 booster), is in fact an actual TB-83

[nickbungus]

Yes it was correct but we didnt know for sure.  Now we do!

[maynut]

I guess Fryer can't fool us