I have one too and the pedal sounds great if I cut down the treble on my DRRI head otherwise it's just too harsh but then
my other pedals don't sound good. Any suggestions which capacitors to change... to tame down the harshness.
Anyone knows what to do with volume issue too? Thanks!
Fryette Effects - SAS EF86 Overdrive [traced]
- Liquids
- Breadboard Brother
From the schematic I saw on page 2, the easiest way to reduce treble post-clipping MAY be adding a capacitor wired from one of the outside lugs of the volume pot to the other outside lug (so the treble cut will not be interactive with the volume setting). I haven't scrutinized the layout of the pedal to see if theres a better way, but that should work in general. The size of the cap will vary with your taste. It's hard to calculate it unless someone can estimate the output impedance of the tube gain stage is, other than it being no larger than 100k...a very wide range of possibilities beyond that.energo70 wrote:I have one too and the pedal sounds great if I cut down the treble on my DRRI head otherwise it's just too harsh but then
my other pedals don't sound good. Any suggestions which capacitors to change... to tame down the harshness.
Anyone knows what to do with volume issue too? Thanks!
- ppluis0
- Diode Debunker
You should put a resistor in series with the "hot" lug of the volume pot ( the outer lug that isn't connected to ground), to attenuate the level of signal and make that potentiometer more useable. I guess that a value of 100K is a starting point.energo70 wrote:Anyone knows what to do with volume issue too? Thanks!
Also, to reduce the harsh, a forum member suggest to remove the couple of back to back diodes placed at the output of the op amp.
Look at the images that appears in the first post of this thread to locate a pair of tiny blue diodes, and merely lift one terminal of each one instead to remove completely -if you after decide to solder again- and tell us what you hear.
Be aware to unplug the power pack of this pedal and wait several minutes to allow discharge the energy of the supply condensers to avoid an electric shock, prior to work inside this unit...
Keep us posted about this mod.
Cheers,
Josè