Crunch Captain Presence overwhelming

[box1gosrgo]

I've built the Crunch Captain (not deluxe) and it works fine. But the Presence control is unusable after about 10 o'clock on the pot (way too much for my taste). It's a B20k. Would a B10k give me a broader sweep? or maybe go to a A20k?

 

[DailyDovetails]

I would a larger value capacitor at C9. You could just alligator clip one in parallel to find a value you like. I would try putting a 10NF in parallel and if that goes too far try a 6.8, 4.7 ect until you find the value you like. Then install the closest cap value you have in that spot. Caps add in parallel so the 10NF and 22NF would be a 32 so put a 33NF, the closest standard value in that location. I'm guessing changing the pot would have some effect also but I'm not 100% sure.

 

[box1gosrgo]

I would a larger value capacitor at C9. You could just alligator clip one in parallel to find a value you like. I would try putting a 10NF in parallel and if that goes too far try a 6.8, 4.7 ect until you find the value you like. Then install the closest cap value you have in that spot. Caps add in parallel so the 10NF and 22NF would be a 32 so put a 33NF, the closest standard value in that location. I'm guessing changing the pot would have some effect also but I'm not 100% sure.

ok, thanks. I'll give that a shot.

 

[box1gosrgo]

C9 didn't have an affect on Presence at all. I went all the way up to 330nf. All it affected was volume. I ended up adjusting C8 to 100nf. This brought both Presence and Tone sweeps exactly where I wanted them. Well balanced for both single coils (American Strat with CS69 pickups) and humbuckers (Music Man Axis). I tried it on 3 amps and it sounded great on all of them (Fender Deluxe Reverb, Marshall Silver Jubilee and Matchless Lightning).

 

[DailyDovetails]

That's interesting. I thought C8 would interact more on the tone control and C9 on the presence. I wasn't 100% sure how the voltage divider for presence worked with C9 there. I looked at a few schematics but couldn't see a lot of continuity on how the presence controls were arranged. I guess I have some more studying to do. That's awesome you got it working how you like.

 

[box1gosrgo]

That's interesting. I thought C8 would interact more on the tone control and C9 on the presence. I wasn't 100% sure how the voltage divider for presence worked with C9 there. I looked at a few schematics but couldn't see a lot of continuity on how the presence controls were arranged. I guess I have some more studying to do. That's awesome you got it working how you like.

I thought the same about C8. I tried it just for the heck of it, fully expecting it to just affect the tone. happy accident I guess