Electronics > Projects, Designs, and Technical Stuff
old style green axial ceramic capasitor
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Otto Olsen:
Hi!! im a newbe here on this forum, my current project is a redraw of the schematics and pcb of this little guitar amp, this series amp was made back in the 80's, and some of the components are not in production at this time, and some are hard to find. i need to find a good replacement for some of them. this green ceramic capacitors are one of them, do anybody knows a realy good replacement type capacitor for theese,  there is the possibility for both thruhole and SMD to be used, the current design is based on the old style pcb, but it will be a 2 sided board, not single sided as the stock was, in the future there may be an all SMD board design. but this require alot work, and i want to save the sound of the amp as mutch as possible.

Best Regards Otto
Wimberleytech:
Do you have the schematic?
DaJMasta:
If they are ceramic capacitors, replacing them with ceramic radials (not as many axials around) would work fine, though it may look goofy.  You can go up to polyester or other film caps in axial form factors if you want, but I suspect all the important caps in the signal path are probably the electrolytics, so the ceramic ones on the board are probably decoupling or are used in places where the potential for microphonics or other issues are very low.


Just make sure they aren't inductors!  I wouldn't expect it in an amp like this, but it can be tiring looking at a board with all this sort of package, because they exist as resistors, capacitors, and inductors...
Otto Olsen:
Hi Yes i have the old schematics for this amp, it is not so good,made in the 80's but there is a light description of theese caps, and ofcorse there is the possibillity fo follow the tracks. i wil try to add it , i am pretty mutch a beginner in electronics, i do have some skills and most of the tools , and i have an expert friend, but he is often quite busy.
in this amp there are theese caps i need to replace, those and 4 Dual N CH JFET 8pin DIP  ( J406 )   that is out of production, and i cant find new old stock eighter + i realy want parts that is in production today.

Best Regards Otto
Otto Olsen:
 Hi !! any caps that is propper for the amp will fit, because i have not made the pcb yet, it can be changed to fit any caps in a propper way, yes im aware of the inductors, but theese are ceramic caps. but i think there is a few inductors aswell they are darker green

Best Regards Otto
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