Ceriatone Forum

What is the difference in sound when you increase the values of the caps on V2 from 330pF to 470pF? I have heard that it makes the harshness in the OD go away, but do you lose a lot of high end and clarity? Does it give the OD channel a lot more midrange (not what I'm looking for)?

What I was hoping it would do would be to make the Overdrive channel smoother and less "grainy" for want of a better word, but retain the high end and not boost the mids any. Is that the effect of this mod?

The snubbers act as a low-pass filter. Higher values of snubber cap bring the knee down in frequency.
They should not affect mids much...

Maybe a better thing would be to use treble bleed circuit...
500k trimmer and .001uf cap to ground from OD2 plate
This way you could set the amount of treble you want... it's like having a little treble HRM in there.


 ;)

 Because the overdrive on my OTS (standard, October 2008  version) is a little harsh and I've noticed that nobody's final layout has the 2 470 pFs as the snubbers, (everyone seems to return to the lower value), I'm interested in trying this treble bleed circuit out,but I'm unsure of how to implement it (I'm kind of a noob). I have  a couple of questions (and thanks in advance for your time)

1) If I don't want to have the treble bleed characteristics to change as I turn the ratio pot, I would have to avoid the middle lug of the ratio pot and just attach the trimmer and cap across the other two lugs, correct?

2) Are the trimmer and cap in parallel or in series?

I think this jpg will help you with your questions...
 ;)

Thanks mcinku, once again,  for your help.

I installed a simple treble bleed circuit last night on the Ratio pot; didn't have a trimmer so I used a 100K resistor until I get one, in series with a .001uF cap. That was like the missing piece for my amp, no more harshness in the OD, and suddenly there was the Ford tone. The other mods on this amp are:

The Gil Ayan OD entrance mod
3 way Bright switch (120 pF-off-47pF)
Changed the Mid cap to .047uF
Deep mod

Many thanks to all those who have helped me

I'm glad this works for you...

As far as I know many people use the trimmer just to find what value they like and than use the resistor instead.
 ;)

If I had put the treble bleed on the Level pot instead of the Ratio pot, would my clean channel be brighter, or is the Ratio pot completely isolated electronically from the clean channel?

What every you do on the V2 tube... the clean would not be affected.
If you do something on the V1, the OD will feel that.
 
OD Level and Ratio are OD only, so clean will stay "clean".
;)