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Cornish TB-83 Treble Booster?

Started by nickbungus, December 21, 2015, 04:47:07 AM

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sopapo

#40
February 17, 2019, 05:46:14 PM
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??

sopapo

#42
February 18, 2019, 01:24:09 PM
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

#43
March 01, 2019, 03:58:11 AM
What is the value of C5?
  • SUPPORTER
60 pedals and counting!

nickbungus

#44
March 01, 2019, 08:24:04 AM
1n

I'm also happy that the electrolytics are 100uF and 47uF.   
To the extreme, I rock a mic like a vandal.
Light up a stage and wax a chump like a candle.

sopapo

#45
March 02, 2019, 06:54:05 PM
100 uf for the power caq filter and 47 for the emiter one?

nickbungus

#46
March 04, 2019, 06:51:00 AM
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)
To the extreme, I rock a mic like a vandal.
Light up a stage and wax a chump like a candle.

sopapo

#47
March 04, 2019, 08:14:39 PM
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

#48
March 24, 2019, 01:30:22 PM
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

#49
March 24, 2019, 03:25:39 PM
Yeah I've got it.  I'll post the schematic tomorrow as it's on my work pc
To the extreme, I rock a mic like a vandal.
Light up a stage and wax a chump like a candle.

maynut

#50
March 24, 2019, 05:03:48 PM
Ooh interesting! Excellent, looking forward to this! Time to get the soldering iron out...

nickbungus

#51
March 25, 2019, 05:24:57 AM
Here you go!!!  The most underwhelming experience after spending so much time scrapping off all the epoxy.

To the extreme, I rock a mic like a vandal.
Light up a stage and wax a chump like a candle.

maynut

#52
March 25, 2019, 05:28:30 AM
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

#53
March 25, 2019, 05:40:45 AM
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.

To the extreme, I rock a mic like a vandal.
Light up a stage and wax a chump like a candle.

maynut

#54
March 25, 2019, 05:57:25 AM
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 8)

nickbungus

#55
March 25, 2019, 06:50:46 AM Last Edit: March 25, 2019, 06:55:37 AM by 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. 

To the extreme, I rock a mic like a vandal.
Light up a stage and wax a chump like a candle.

maynut

#56
March 25, 2019, 07:28:35 AM
Great work Nick, thanks again for this!

maynut

#57
March 25, 2019, 07:50:31 AM
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

#58
March 25, 2019, 08:15:08 AM
Yes it was correct but we didnt know for sure.  Now we do!
To the extreme, I rock a mic like a vandal.
Light up a stage and wax a chump like a candle.

maynut

#59
March 25, 2019, 09:26:23 AM
I guess Fryer can't fool us  :icon_lol:
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