Search found 18 matches

by holio cornolio
Tue Jan 11, 2022 10:45 am
Forum: Boss Pedals
Topic: SD-1 diode swapping.
Replies: 46
Views: 25298

Re: SD-1 diode swapping.

My sd-1 collection continues to swell. I really don't know why I keep buying them. I'm currently obsessed with black label MIT units, because there seems to be some reasonably significant variation in component suppliers used at that time. I've seen (in my searches), ornage, green and silver caps us...
by holio cornolio
Wed Dec 22, 2021 6:34 am
Forum: Boss Pedals
Topic: SD-1 diode swapping.
Replies: 46
Views: 25298

Re: SD-1 diode swapping.

bob barcus wrote:
Sat Dec 18, 2021 7:59 pm
I like the GE diodes in my 2001 SD1 But the Best to my ear is the 1984 SD1 with C 6 clipped But I use 100 watt plexi Marshall They got it right back then
Oh the Vshock don't need no c6 clip.
by holio cornolio
Mon Dec 20, 2021 3:56 pm
Forum: Boss Pedals
Topic: SD-1 diode swapping.
Replies: 46
Views: 25298

Re: SD-1 diode swapping.

drives2.jpg here it is. notice that the opamp has the print scratched off... I'm not implying that there's any mystery afoot, just seems odd that this would have been done. No idea on date of manufacture or any of that at this point. in the absence of a serial number or a date code on the IC, anyon...
by holio cornolio
Mon Dec 20, 2021 3:38 pm
Forum: Boss Pedals
Topic: SD-1 diode swapping.
Replies: 46
Views: 25298

Re: SD-1 diode swapping.

I've just picked up a vshock super overdrive sd-10. It's supposedly a sd-1 clone and I've yet to trace the board but good god it's a nice overdrive. Notwithstanding the fact that the pots need a good clean, it's about as close to sounding like a long chip od-1 as I've heard. Weirdly, the opamp has h...
by holio cornolio
Mon Dec 06, 2021 12:23 pm
Forum: Boss Pedals
Topic: SD-1 diode swapping.
Replies: 46
Views: 25298

Re: SD-1 diode swapping.

A slight tangent, I have decided that I'm probably going to return my capacitor modded sd-1 to stock, or close to stock. My mod was loosely based on the Monte allums mod, which focused most of the functional mods on flattening he mid hump and increasing bass. (there was a diode mod and an increased ...
by holio cornolio
Mon Dec 06, 2021 12:14 pm
Forum: Boss Pedals
Topic: SD-1 diode swapping.
Replies: 46
Views: 25298

Re: SD-1 diode swapping.

Well, this is an intensely detailed (and interesting) thread. I was entirely ignorant of the parts changes to the design, so I'm curious. (Though fully aware and SD-1 sounds like an SD-1 no matter what ;) ) I actually have (somewhere) 2 x SD-1s MIJ . My spreadsheet tells me they are August 85 (Batc...
by holio cornolio
Sun Dec 05, 2021 8:51 am
Forum: Boss Pedals
Topic: SD-1 diode swapping.
Replies: 46
Views: 25298

Re: SD-1 diode swapping.

I have the chance to buy a march '84 pedal. No opportunity to see inside it though. What are the chances of it having the 1s2473?? I would not risk to buy without asking the seller to show the pcb. The 1S2473 is an exception in MIJ SD-1. The black band diode from the begin in February 1981 up to 19...
by holio cornolio
Sat Dec 04, 2021 8:35 pm
Forum: Boss Pedals
Topic: SD-1 diode swapping.
Replies: 46
Views: 25298

Re: SD-1 diode swapping.

I have the chance to buy a march '84 pedal. No opportunity to see inside it though. What are the chances of it having the 1s2473??
by holio cornolio
Sat Dec 04, 2021 8:22 am
Forum: Boss Pedals
Topic: SD-1 diode swapping.
Replies: 46
Views: 25298

Re: SD-1 diode swapping.

I just learn something about the SD-1, it's a side note about it, didn't know where to post it so I am posting here. When exactly the production moved from Japan to Taiwan? Well, last made in Japan = 87XXXX February 1988, obviously first made in Taiwan 88XXXX March 1988. I have a MIJ 874581 and the...
by holio cornolio
Fri Dec 03, 2021 11:54 pm
Forum: Boss Pedals
Topic: SD-1 diode swapping.
Replies: 46
Views: 25298

Re: SD-1 diode swapping.

So I had a small change of plan. Given that my mij and MIT units sound very similar, I decided to use the MIJ as a kind of aural benchmark and a/b it against the unmodded MIT pedal. Having got a decent aural memory of the comparison, I then swapped the 1n4148 in the MIT pedal for 1n1588. I then a/b...