Cobalt Drive with Keeley/Phat Mod...
- Thread starter RobertJay
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Paradox916
Well-known member
This Week on the Breadboard: Blues Driver BD-2 & BD-2w - part 3
The CB mods I like the idea of the S/C switch, but I want it to have a more pronounced effect. Dividing the S/C switch into a TIGHT switch and a FAT switch simplifies things and allows four tonal options instead of two. The TIGHT switch I find switching C41 in and out to be counter-productive...
forum.pedalpcb.com
Check out this thread it might be helpful
Paradox916
Well-known member
You are correct that the original circuit is a 10k in the thread I posted for you in part 4 he listed using a 100k, and I believe I found the build docs you might be working off of using 2M for R24.. It would still work but I’m not how sure it would jive with some other pedals if I’m correct in assuming it might significantly change the output impedance (I could be totally off on that). If I were you I would start with 100k and see if you were happy with that. Hell you could even socket it and work your way up or down, the 2M in that position doesn’t pose any threat to the pedal it’s self given I only looked at those last output components and not anything up stream in the mods, probably not the most technically correct advice you were looking for but this might nudge someone to come along and give you something more concrete.
Barry
Well-known member
Of all the mods I studied none with the exception of Wampler (and most recently Chuck D Bones) changed any resistor values
Paradox916
Well-known member
Are you talking to yourself?…
Hey, I'm sorry I didn't include the build doc pic. But yes! How about another one that I built! I asked the same question to the guy that did this mod on YouTube and no reply. The pedal tested ok as far as I was concerned, but the customer did complain about a low put put level. I thought he was pulling my leg as he's also going direct into a pc interface, I was happy with the pedal using an amp. Perhaps the 2M is too high and cutting the output. Thank you! This did help, I think. Haha. I'll pass along the build doc I was going off off. It's close to the original as far as resistors go... Except for this one.
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Barry
Well-known member
I often do!Are you talking to yourself?…
Hey, wrapping this up and keeping in touch. The phat mode seems useless. I've seen other post about how they can't hear the difference, I stuck with the 33nF value and no extra switch. As far as the R24 value. I also hear no change. I soldered in a 100k in the spot and piggy backed a 1.8m. Sounded the same as it played, I cut the lead and had no output level change. So... It's whatever. Thanks all.
