OLD RUSSIAN BOSS SD-1 to TS9, help please(pics!!!)

[ocg]

i have this broken old sd-1 copy that i want to transform in a TS9

but the problem is that i dont know if that effort is necessary...
here are some pics:



LOOK THE 2 TRANSISTORS IN THE "FLIP FLOP" SWITCHING SECTION.....and the IC of course "k157"? it suposed to be a rc4558....




ok, the circuit its actually the same of an original BOSS SD-1(i chek the boss sd-1 service manual), with the obvius difference of the IC type...

So what do you think? ...
should i do the ts9?(with new resistors, ic, caps, etc)
Are the components showed in the photos valuable?

thanks, and sorry for my english...im from peru

[kupervaser]

I would never mod this pedal if i was you.

In fact i would love to buy this from you in the condition as is, or i could build you tubescreamer and trade.

I am very interested in this one as i am from Russia and want to onw something from there.

Pm me or email: angar666@hotmail.com
THanx in advance,

[Br4d13y]

ya +1 on the rarity of the circuit, i have never heard of boss effects from russia, just ehx

[kupervaser]

I've found the schematic of this chip:

http://tec.org.ru/elcomp/ic/ic-oy/k157ud2.htm

It sais that it is a two channel universal operational amplifier.

The funny thing is that it also sais that there are no foraing substitute for this chip.

ANywho i would like to own this thing.
Jeff

[MikeH]

Seriously, if you mod that thing I'm coming to wherever you live and clobbering you!   

I've really never seen anything like that before, can you post a pic of the back plate?

[petemoore]

  Someone went to interesting works on this one.
 Looks like there are various sizes and types of resistors, I don't remember seeing 'orange stamp-shape' capacitors before. It looks like there may be some clues to a very interesting history on this one..lotsa 'mojo' parts put into something that works, kinda like museum or artpiece, just cause it's odd and looks old.
 Looks sorta like it was made in the 60's or 70's.
 Whatever it is, it's charming the way it sits, and you can build yourself up something that maybe beats it sonically, I wouldn't even attempt to mimic that style...it looks as though the board was designed to accomodate the varied size/ratings of resistors used [dependant on availablility at the time I suspect].  
 ...anyway it 'looks' "genuine"..unique...

[kupervaser]

Probably they didn't have anything else back than in that time. They just put whatever they could find and didn't care about how it looked!

I doubt it sounded good anyway.  Really cool thing to have. Hopefully not too damaged. I mean if you have to replace 80% of components what would be the point.

[MikeH]

Funny (Well, not really funny) when I cracked open my Russian BMP it had the exact same type of resistors and caps.

[kupervaser]

Do you have an old Big Muff?

I must say they do look familiar. I've seen them in many radio's back in Ukrain.

[Ice-9]

Yeah , when i was in college about 1985 those were the caps we had (ceramics i think) Great pedal by the way , it would be a shame to butcher it up.

[MikeH]

Do you have an old Big Muff?

I must say they do look familiar. I've seen them in many radio's back in Ukrain.

No, it was actually a 90's Green Tank version.  Well, it's getting old now I guess.

[German]

Change electrolyts. Change those red ceramic caps to film caps. Desolder one clipping diode.. And you will get TS-9.
You dont need to change caps in IC's correction ways. And green caps too.

[ppatchmods]

let's not get carried away guys. it does look very rare and old, but the sd-1 circuit was first made public in '81.

[MikeH]

let's not get carried away guys. it does look very rare and old, but the sd-1 circuit was first made public in '81.

None the less, it's unique enough not to chop to bits.  That is, unless someone has already chopped it to bit's; in that case- who cares, cut it up.

Are those germanium transistors?  I bet this thing sounds nothing like an SD-1.

[foxfire]

today's trash is tomorrows treasure...

[German]

No, there are no Ge transistors.
Yellow ones are KT315.
Metal trannies are fets - KP303 (êï303à or êï303á there are first two letters on it to decode)
That black one is something like KT310/318 or similar.

It's not very rare.
Could be around 1989/1995 (first date could be noticed at one capacitors side - 8805)..
Blah.. Just noticed another one on chip - 8901

And it must sound really close to SD1.

[Ice-9]

the metal transistors will probs be the fets for the bypass circuit

[ocg]

the metal transistors will probs be the fets for the bypass circuit

thats right, those two metal transistors are Q1 and Q2 in the original SD-1 schematic
the black transistor is Q5

the "yellow" ones:
the one next to the metal transistor is Q6
the other two are Q4 and Q5

this pedal doesnt make any sound, i guess the switching circuit is broken....but im not sure, im not good in debugging.

[ocg]

Seriously, if you mod that thing I'm coming to wherever you live and clobbering you!   

I've really never seen anything like that before, can you post a pic of the back plate?

whats clobbering? hehehe

No problem, i will take some hi resolution pics of the back plate and the codes on the transistors for those of you who can help me find some datasheets

[Fuzz Aldryn]

Hi,

as I grew up in the former GDR (part of the former Eastern Bloc, for those who don't know) I can assure you that these are pretty common parts used in that pedal for that time and that region - no mojo, nothing special. Funny, that some people always think a metal can trannie must be a always a germanium one. What might they think, if I would post pics of a LM741 in a metal can enclosure. A Ge IC? Judged by the used parts the pedal could be from the second half of the eighties or early nineties. It's a pitty that's such a pain in the ar** to find the datasheets for those russian ICs - I got a whole bunch of them on old eprom-prog-boards made in the GDR in th late 80s.

Regards
Helge