Ceriatone Forum

Ceriatone => Overtone => Topic started by: axiology on May 12, 2010, 12:25:14 AM



Title: New DIY OTS build
Post by: axiology on May 12, 2010, 12:25:14 AM
It came up OK right from the start, I was thinking of plugging it in using a long extension cord from the next room, with a fire extinguisher handy :)

I put a couple of  pics of it mounted in its tweed cab in the "Pics of completed Overtones"  Thread
Not sure any more pics of internals are required but,

(http://i245.photobucket.com/albums/gg79/axiology_2008/OTS3.jpg)

(http://i245.photobucket.com/albums/gg79/axiology_2008/OTS1.jpg)








Title: Re: New DIY OTS build
Post by: mcinku on May 12, 2010, 06:05:01 AM
Good job,

what are those strange looking caps... haven't seen those in Ceriatone kits before
 ;)


Title: Re: New DIY OTS build
Post by: axiology on May 12, 2010, 04:07:59 PM
Good job,

what are those strange looking caps... haven't seen those in Ceriatone kits before
 ;)

I guess you're referring to the big brown ones on the main board. I looked at your build pics, they're certainly different, much larger for sure. According to the layout they should be .1uf, maybe a higher voltage rating.
There seem to be polarization marks on them, but they're not electrolytics. I recall a few weeks back I was reading a thread on I think, the ampgarage site concerning an amp builder who was  testing some of his allegedly non-polarized caps, finding a consistent difference in performance depending on polarity. Maybe Nik has picked up on this and started doing the same.


Title: Re: New DIY OTS build
Post by: cyndicate on May 12, 2010, 07:41:08 PM
Sweet! More pictures of internal the better! Can never have enough pictures, I would love some close ups of all the insides so it can help when I build my OTS HRM BM build. I can't wait to get my kit, I have the transformers waiting to be used already.


Title: Re: New DIY OTS build
Post by: erwin_ve on May 12, 2010, 08:10:45 PM
The outer foil is marked because it can be used as a shield against electric field coupling into the capacitor.
It looks like this: plate voltage-->>cap(outer foil-->other side;inner foil)-->>to next gain stage.

When done the right way your amp can be considerably more quiet.

For further info on this subject visit: http://www.aikenamps.com/OutsideFoil.htm (http://www.aikenamps.com/OutsideFoil.htm)

Good job,

what are those strange looking caps... haven't seen those in Ceriatone kits before
 ;)

I guess you're referring to the big brown ones on the main board. I looked at your build pics, they're certainly different, much larger for sure. According to the layout they should be .1uf, maybe a higher voltage rating.
There seem to be polarization marks on them, but they're not electrolytics. I recall a few weeks back I was reading a thread on I think, the ampgarage site concerning an amp builder who was  testing some of his allegedly non-polarized caps, finding a consistent difference in performance depending on polarity. Maybe Nik has picked up on this and started doing the same.