I guess I got to start somewhere now that I've figured a few little basic things out...
I just recently got a little old Finnish modular mixer-amp that was apparently used as a central announcement / speaker control system at a school. Lots of the modules had already been ripped out by someone else, but a two mic-stage card and one card with phono + line stages were still left (and a pushbutton board or two with the wackiest buttons ever, I HAVE to use them somewhere).
Aside seemingly uninspiring ye olde Fairchild dual opamps (uA739PC), every channel had a transformer in it. Three of the four trafos are Beyer 351 010 005 which I identified with the scanned Beyer catalog to be single primary, 1:10 winding. However, I didn't manage to find the right datasheet anywhere, I looked at http://audio.kubarth.com/rundfunk/ ... is it there at all?
I would guess the trafos would be good in mic pre designs at least. Any specific suggestions or other ideas? I'm really a beginner so I don't have any good ideas where to use them yet, but I'm still going to salvage them for future use. Seems like some people ordered a few of them in the Beyer groupbuy, what are you guys going to use them in?
The fourth transformer (in the line channel) is very similar form factor but just has a yellow tape around it that says "SMm 9039". does this say anything to anyone? a bit of googling didn't get me anywhere.
Oh, yet another newbie question: do trafos break or wear down easily? I guess the boards have been used quite a lot at the school but probably not abused heavily (who knows...). Would it be safe to assume that the Beyers still work? Anything particular I should check there?
I just recently got a little old Finnish modular mixer-amp that was apparently used as a central announcement / speaker control system at a school. Lots of the modules had already been ripped out by someone else, but a two mic-stage card and one card with phono + line stages were still left (and a pushbutton board or two with the wackiest buttons ever, I HAVE to use them somewhere).
Aside seemingly uninspiring ye olde Fairchild dual opamps (uA739PC), every channel had a transformer in it. Three of the four trafos are Beyer 351 010 005 which I identified with the scanned Beyer catalog to be single primary, 1:10 winding. However, I didn't manage to find the right datasheet anywhere, I looked at http://audio.kubarth.com/rundfunk/ ... is it there at all?
I would guess the trafos would be good in mic pre designs at least. Any specific suggestions or other ideas? I'm really a beginner so I don't have any good ideas where to use them yet, but I'm still going to salvage them for future use. Seems like some people ordered a few of them in the Beyer groupbuy, what are you guys going to use them in?
The fourth transformer (in the line channel) is very similar form factor but just has a yellow tape around it that says "SMm 9039". does this say anything to anyone? a bit of googling didn't get me anywhere.
Oh, yet another newbie question: do trafos break or wear down easily? I guess the boards have been used quite a lot at the school but probably not abused heavily (who knows...). Would it be safe to assume that the Beyers still work? Anything particular I should check there?
