Yellow glue-like stuff in sd-1??

[Kræn]

Hi

I've opened my sd-1 to prepare a little mod for it. But some of the caps that I want to change have this yellow stuff over them that makes them stick to the othe caps. I've tried to break it apart, but I fear I'll break some of the caps that don't need changing. What to do?? Here's a pic.



Thanks
Christian

[MartyMart]

Its a kind of "Glue/Gunk" that keeps the parts from moving around.
Use a small pair of needle nose pliers and carefully start to "nibble away"
at the stuff, removing small chunks at a time.
DONT pull hard on a big  section, you may damage the part/board !

I've removed that from around 20 SD-1's with no problem

Marty.

[Kræn]

Ok. Thanks.

Christian

[cd]

Its a kind of "Glue/Gunk" that keeps the parts from moving around.

It also prevents a possible source of oscillation.  Not that I've ever had any SD-1 oscillate, even with the glue removed, but YMMV.

[Peter Snowberg]

It also prevents a possible source of oscillation.  Not that I've ever had any SD-1 oscillate, even with the glue removed, but YMMV.

Hmmmm.... oscillation? If you bend the caps the "other" way to get them close to other components, does feedback start happening?

I'm curious where the gooped caps are in the signal chain. No goop in my DS-1.

Another way to get around that stuff is with a razor blade or razor knife. Those brown caps have a nice hard epoxy shell so it's quite easy to cut the glue without harming the component. Warming the razor knife over an alcohol flame will make it cut easier. Warming the board will help too, just don't get it too warm for the sake of the electrolytics.

[Kræn]

Thanks for the replies. I managed to relieve the board of the .....stuff  .A sharp knife and a pair of needle nose pliers did the trick.

Christian

[jmusser]

Since I've scavanged so many parts, I have seen a lot of that stuff. Some of it, is like a melted latex glove dripped all over the place, some of it is close to RTV, and other things (it seems like especially in radios) is sort of like a wax. Some of it make sense, to keep choke cores from moving, or pots set to the same adjustment, but there's other times, it seems there's no rhymn or reason to it, and a whole block of components are gooped with it.

[formerMember1]

maybe it is there is discourage people from modding them and learning more about the electronics in there,(just to scare the unknowledgable)  if that is the case, too bad they never heard of this forum!! 

[Kræn]

maybe it is there is discourage people from modding them and learning more about the electronics in there,(just to scare the unknowledgable)  if that is the case, too bad they never heard of this forum!! 

Don't think so... I know absolutely nothing (well, a little maybe after about a month here) about electronics. And I'm going to mod mine!! Wether or not BOSS like it!!

Christian

[Paul Perry (Frostwave)]

The yellow goop isn't to stop reverse engineering (if you wnt to do that, you use black epoxy that covers everything & is harder to pick off). The stuff here (might well be a kind of hot glue) is to stop parts vibrating. I have seen components (especially filter caps) that have had legs fracture from vibration, glue it down & you are safe. Hell, in the 50's, people used to TIE components down!! that's as quaint as thatched roofs now..

[formerMember1]

The yellow goop isn't to stop reverse engineering

oh yeah i know, i was only kidding,if they wanted to do that they would just make it like those DUMBLE tube amps, where he just dumps two buckets of black silicon on there to stop "copiers"