Son of Ben Preamp - B2M hack with headers

jeffwhitfield

Well-known member
So, if you're like me, you probably had a hard time getting a B2M pot in a PCB mount format, much less a B1M dual, and had to go with the solder lug variety. I wrestled with this a bit, contemplating just using some jumpers to hook it up. But, after careful consideration, I found a nice hack. Probably nothing that no one hasn't done before. Basically, you just use a few headers to mount the pot to the board in such a way so that it mimics the same result as a PCB mount.

IMG_0106.jpeg
I recommend mounting your other pots first before adding this one though. Once those were installed on the board, I started off by tack soldering one header to the center lug of pot, positioning the pot so that it's more or less lined up with the rest of the post, and then tack soldering the header to the board itself. After that, I positioned the other headers and tack soldered them to the pot but not the board (not yet!). You may have to bend the lugs of the pot a bit to get them to line up right. Once that's been done, I installed the PCB back into the enclosure and then soldered the headers onto the board. End result is a pot that aligns well with the enclosure and works just as well as a PCB mount pot. :D

In terms of sound, the Son of Ben more or less meets my expectations. It's a solid preamp with a nice bit of warmth to it. Probably won't be a mainstay pedal for me. I got it mostly so I could hear what a J201 driven JFET pedal sounds like. I'll likely use it later in some setups to juice a fuzz or some other distortion pedal.

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Hi Jeff, great jack. I bought a roll of jewelry making wire for just this reason. Leads are a little thin, and I’ve taken to just throwing my them away, or clipping them off above the trash can.
 
So, if you're like me, you probably had a hard time getting a B2M pot in a PCB mount format, much less a B1M dual, and had to go with the solder lug variety. I wrestled with this a bit, contemplating just using some jumpers to hook it up. But, after careful consideration, I found a nice hack. Probably nothing that no one hasn't done before. Basically, you just use a few headers to mount the pot to the board in such a way so that it mimics the same result as a PCB mount.

View attachment 22074
I recommend mounting your other pots first before adding this one though. Once those were installed on the board, I started off by tack soldering one header to the center lug of pot, positioning the pot so that it's more or less lined up with the rest of the post, and then tack soldering the header to the board itself. After that, I positioned the other headers and tack soldered them to the pot but not the board (not yet!). You may have to bend the lugs of the pot a bit to get them to line up right. Once that's been done, I installed the PCB back into the enclosure and then soldered the headers onto the board. End result is a pot that aligns well with the enclosure and works just as well as a PCB mount pot. :D

In terms of sound, the Son of Ben more or less meets my expectations. It's a solid preamp with a nice bit of warmth to it. Probably won't be a mainstay pedal for me. I got it mostly so I could hear what a J201 driven JFET pedal sounds like. I'll likely use it later in some setups to juice a fuzz or some other distortion pedal.

View attachment 22075
View attachment 22076
I feel like I am missing something. What pot value did you use here? Is it just a B1M single? Just about to put in another order from Tayda. They are out of the dual but have a PCB mount B1M. Would that work?
 
I feel like I am missing something. What pot value did you use here? Is it just a B1M single? Just about to put in another order from Tayda. They are out of the dual but have a PCB mount B1M. Would that work?
A dual would have to be B1M. If it's a single then it needs to be B2M. None of these are in stock in a PCB format. You'll have to use a solder lug one like this:

 
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A dual would have to be B1M. If it's a single then it needs to be B2M. None of these are in stock in a PCB format. You'll have to use a solder lug one like this:

Thanks. I haven't been focusing much on building pedals the last 3 weeks. But some Russian germanium transistors showed up earlier than expected so I might try to finish the Benson and the Broadcast once I get the rest of the parts I need from Tayda.
 
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