Son of Ben (Benson Preamp) Modifications Thread

Bricksnbeatles

Well-known member
Inspired by @Big Monk’s recent modifications threads for the Electrovibe, XC Phase, and Hydra Delay, I thought it would make sense to create a dedicated thread to compile all of the popular modifications made to the Son of Ben circuit (Link to the PCB here).

Let's list them and see what we can add/subtract/clarify:

1.) omit c10 (c10 only existed in the first few Benson Preamps produced, and makes the pedal just a little bit more gainy) for current spec/less gain*
2.) reduce c10 value (gives light mid boost effect according to this comment from our resident guru, @Chuck D. Bones)*
3.) 18v charge pump (and increase capacitor voltage ratings accordingly) for more headroom**
4.) omit c5 (and c10) for noticeably lower gain


Not a ton of mods here so far, but it seems like a popular one to modify, so I’m sure we’ll be able to add more to this list together!


* these two could be combined by using a spdt or dpdt on-off-on switch (just depends on how neat you want your off board wiring to be) with a 10u and 4u7 (or other, smaller value) cap, giving you early spec(10u)/modern spec(none)/mids(4u7)

** using the spdt pads on the charge pump daughterboard, you could wire up an external on/on switch to allow both 9v and 18v operation
 

Big Monk

Well-known member
Inspired by @Big Monk’s recent modifications threads for the Electrovibe, XC Phase, and Hydra Delay, I thought it would make sense to create a dedicated thread to compile all of the popular modifications made to the Son of Ben circuit (Link to the PCB here).

Let's list them and see what we can add/subtract/clarify:

1.) omit c10 (c10 only existed in the first few Benson Preamps produced, and makes the pedal just a little bit more gainy) for current spec/less gain*
2.) reduce c10 value (gives light mid boost effect according to this comment from our resident guru, @Chuck D. Bones)*
3.) 18v charge pump (and increase capacitor voltage ratings accordingly) for more headroom**
4.) omit c5 (and c10) for noticeably lower gain


Not a ton of mods here so far, but it seems like a popular one to modify, so I’m sure we’ll be able to add more to this list together!


* these two could be combined by using a spdt or dpdt on-off-on switch (just depends on how neat you want your off board wiring to be) with a 10u and 4u7 (or other, smaller value) cap, giving you early spec(10u)/modern spec(none)/mids(4u7)

** using the spdt pads on the charge pump daughterboard, you could wire up an external on/on switch to allow both 9v and 18v operation

I was just checking this PCB out yesterday when i was looking at the Clandestine. I'll ave to throw it on my list!
 
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