Pedalpcb Uber Drive

Guardians of the analog

Guardians of the analog

Papi Fuego
Build Rating
5.00 star(s)
Well, this is my last build report for the time being. I wanted to make a matching pedal with my amp build. I was also having some noise issues with the previous version of this pedal I made from another vendor so I decided to go all out on this one.

Bone stock, no subs, just the perfect OD for me and my setup. For transistors I used some NOS Japanese that I pulled from the broken PH-2 I bought.
1000011561.jpg

For my enclosure I wanted to do something bright and colorful that really screamed 80s boosted Marshall. I went with a yellow tayda box and UV print with Jubilee. So happy with how it came out and really feels like the other half of my amp build. Kinda sad that the journey has come to an end for now. Still hoping that @Robert finishes the one he started because I'm not the only one who wants to build it 😉
1000011752.jpg 1000011733.jpg 1000011732.jpg
 
Paradox916 said:
It’s hard to beat something like a SD-1 or an 808 to goose the front end of an amp, great build
Click to expand...
Sure can't. And just like that I leave until my last project comes to fruition.
jake-gyllenhaal-goodbye.gif
 
I've seen SD-1 into a JCM-800 in many a live setting and it kills every time! Best of luck as you step away for now...
 
Very nice design!
Is the Uberdrive so good because everyone is saying it or is it really that good?
I think it really is that good :-)
 
What are the specs Hfe and Vf of the diodes and transistors of the original early 80s pedal, so the tone is correct.
I've seen some transistors suggested as direct replacements and had a 200-400 Hfe range, while other suggested at 600-800 and the originals SUGGESTED at the higher range! Likewise, are the diodes 0.6xx Vf range or 0.3xx range?? BIG difference and in bringing the goods and Tone!!

We need someone to test the original vintage 1S1588 and 1S2473 diodes or C732 transistors and communicate the readings 100%!
 
I just found this page which is VERY informative IF correct.
It is only the diode portion and not transistor information but provides the values across all variations.
I just question if they are in-deed confirmed and 100%?!?
It suggests the following Vf's:

  • 1N34A (0.21Vf) - Distortion+, Klon, Rat
  • 1N270 (0.268Vf) - Grey Matter
  • 1N4001 (0.45Vf)
  • 1N4148 (0.68Vf) - Blues Breaker, DS-1, Timmy, TS808
  • 1N914 (0.68Vf) - Blues Driver, Rat, TS808
  • 1S1588 (0.571Vf)- KOT, OD-1, TS808
  • 1S2473 (0.67Vf)- OD-1, SD01
ref: https://www.guitarpedalx.com/news/news/a-brief-hobbyist-primer-on-clipping-diodes
 
equinox said:
What are the specs Hfe and Vf of the diodes and transistors of the original early 80s pedal, so the tone is correct.
I've seen some transistors suggested as direct replacements and had a 200-400 Hfe range, while other suggested at 600-800 and the originals SUGGESTED at the higher range! Likewise, are the diodes 0.6xx Vf range or 0.3xx range?? BIG difference and in bringing the goods and Tone!!

We need someone to test the original vintage 1S1588 and 1S2473 diodes or C732 transistors and communicate the readings 100%!
Click to expand...
I've built a multiple SD-1s and IMO the diodes and transistors don't really make a big difference. The transistors are in unity gain buffers at each end of the circuit. So having a certain gain is not going to change the tone of the pedal. I used the ones I did because the pinout was the same and I didn't have to twist legs around. But a 2904 or 5088 would function just the same.

As for the diode, Ive used 914, 916, 4148 and a couple from SBP that were in the .72 range and they all sounded the same. Unless the fv is significantly higher or lower or you are using something like LED or germanium it's gonna sound the same. I'd argue that the specs of the gain pot in this circuit would have a larger impact on the gain than going from on si diode to another.
 
Guardians of the analog said:
I've built a multiple SD-1s and IMO the diodes and transistors don't really make a big difference. The transistors are in unity gain buffers at each end of the circuit. So having a certain gain is not going to change the tone of the pedal. I used the ones I did because the pinout was the same and I didn't have to twist legs around. But a 2904 or 5088 would function just the same.

As for the diode, Ive used 914, 916, 4148 and a couple from SBP that were in the .72 range and they all sounded the same. Unless the fv is significantly higher or lower or you are using something like LED or germanium it's gonna sound the same. I'd argue that the specs of the gain pot in this circuit would have a larger impact on the gain than going from on si diode to another.
Click to expand...

just check that MF's post history
 
You must log in or register to reply here.
Back
Top