Boss DS-1 (TA7136P with 1S2473 diodes), and SD-1 (with 1S1588 diodes).

[Zanshin]

Build Rating

5.00 star(s)

I have been curious about the TA7136P magic in the DS-1 for a bit and @Guardians of the analog recent build pushed me over the edge.

I figured why stop with the TA8136P, and obtained some 1S2473, and 1S1588 diodes too.

My train of thought went to building a SD-1 too. Both the DS-1, and the SD-1 used the two different diodes types at different times. My armchair guess is the early examples used the 1S2473 and later ones the 1S1588.

After auditioning the two diode types I ended up choosing the 1S2473 in the DS-1 (a little rougher), and the 1S1588 in the SD-1 (a little smoother). It’s pretty subtle.

AionFX Legacy Comet pcb and PPCB Uber Drive pcb.




Here’s my current boss family with new middle knobs:



I have a board and enclosure made for the OS-2, and a board coming for the MD-2. Likely my next builds after my amp project is done

 

[Bucksears]

Nice work!
I'd still love to know where you guys are getting legit TA7136s. I'm using Sylvania ECG1464s, which (on paper) looks to be pretty much identical.
They work great (a little TOO good, in fact), but I'd love to try the real deal just to compare.

 

[Zanshin]

Nice work!
I'd still love to know where you guys are getting legit TA7136s. I'm using Sylvania ECG1464s, which (on paper) looks to be pretty much identical.
They work great (a little TOO good, in fact), but I'd love to try the real deal just to compare.

Thank you! They are around. I.e. a family repair shop closes and they sell off the hidden treasures etc.

I think there’s a few boutique pedal makers doing CE-1 preamp pedals with them, stashes must still exist. Speaking of which, that might be a cool little project to do with one.