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(I could be totally wrong in my explanation here, so keep that in mind) The Ge transistor is biased to 6.75V (trim is maxed out, so I can't get to the recommended 7V). When I first auditioned the Si transistor the voltage jumped to just under 8V. I originally put a 100k pot to ground off the Si...

Final Update: I did a bracket style competition with the Ge transistors I had and originally landed on the CV7007 as my classic Rangemaster sound with a low gain MP39B as option two. I was about to wrap it up when I decided to throw a silicon PNP in there. All the germaniums sounded like...

That Moonn PCB is perfect! I wired up a transistor audition box to find my two favorites and I'll put them on a permanent switch when I'm done.

I have an OC76 and a CV7007 that bias out within .1V of each other when swapped and I can't decide which one I prefer so I figured why not both. Ive been swapping them back and forth for a while and decided I like both and they feel different enough to have in one circuit. The OC76 has a little...

I want to mod my rangefinder by adding a switch (or array) to go between different transistors. Is there a best-practice method for wiring something like this up? I was hoping a 3pdt on/on would work, but I'm also super new to this. Thanks!

Update: I swapped/replaced all the transistors. Biggest difference is that Q3 has lower gain than before; Q1-3 all range between 48 and 61 hfe now. Biggest change overall is I socketed R3 and R7 and replaced them with a 1.8K resistor and a 10k trim pot respectively. Pedal has much more output...

Hey all, I built a Tone Vendor MKII, and while a little bright, the bigger issue is that the output volume is too low. The volume pot on full gets me just under unity gain. before I mess with the 470r and 8.2k resistors to get more volume I figured I'd ask if this circuit is naturally quite or...

I suspect the answer is that I can't use them, but figured I'd ask. I have a bunch of 200+/- HFE 2N3904 transistors lying around and was going to use them in a Carbon Black Fuzz instead of the 2N3903's required. My understanding is 2N3903s have half the HFE, so would my 2N3904s be too much for...

Solved. Thank you so much

[Picking up where another thread left off] I built a Son of a Ben and it all seems to be working correctly except it is incredibly bright. I need to have the bass on full and the treble between 0-3 to get a usable tone out of it. It feels/sounds like there is a significant high-pass filter on...

Hey, did you ever figure this out? I built a Son of a Ben and am having the same problem; the only usable setting is with the bass on full and the treble on 3 (or off). I attached some photos of my build (I've since gotten rid of the painter's tape and replaced it with plastic covers.)

This was perfect, thanks! I put a socket on R4, put in a 1K, re-biased Q2 to 4.5V, and now the pedal has much more output. If I ever want to go back to original spec, I can just pop in the 470R and re-bias.

I could always try to put it on a switch so I can flip it on when I want it

Hey! I built a Sandspur and love the tone, but I need to have the volume cranked to get the right increase in volume. I understand this is typical of some vintage fuzz circuits, but are there any mods I could do to increase the overall output volume? Thanks in advance for any ideas!

[SOLVED] I put thicker material between the board and the pots and the pedal works now. Must have been some metal poking through the tape and contacting the pot

no contact on the dual pot, but there is tape below it to prevent any contact below; its possible the tape failed

The schematic called for that part to be omitted

Hey! I built a Son of a Ben preamp and it won't pass any sound when engaged. It passes signal in bypass and Q1-3 are biased to 4-5V each. Any idea where I should check for bad connections? I feel like if I can bias the transistors, the majority of the circuit is good to go, but I'm an...