| Electronics > Projects, Designs, and Technical Stuff |
| old style green axial ceramic capasitor |
| << < (3/4) > >> |
| Otto Olsen:
Hmm,, all of you guys are right in what you say, theese are old style,expensive, data on them are hard to find, maybe near impossible to get, yes they are in the signal chain, and ceramic caps are microphonic, Still this blody amplifier is some of the best solid state amp made, and they all had theese caps and they did a perfect job, and there must be a replacement for them, and i maybe know 1 guy that possebly know, or can find out about theese caps. because if i change them to a diffrent style, i may destroy the sound of it, dave on eevblog had a video on youtube covered this caps. but he has asked not to be contacted due to to many requests for help, and i respect that, and i cant find the video. BUT theese caps are in my commodore 64 aswell, and maybe Bill Herd knows a thing or to about them, this is the guy that design the commodore 128 in the 80's :-) lets see if he can be contacted, anyway thanks for the support :-+ Best Regards Otto |
| graybeard:
The green capacitors are probably plastic film capacitors. Any equal value with an equal or higher voltage rating will work. You should be able to find one here https://www.mouser.com/Passive-Components/Capacitors/Film-Capacitors/_/N-9x371 I was looking at this before on a tiny screen and what I thought were capacitors is just RTV. Now I see you are circling parts that look like resistors that are marked on the schematic and BOM as ceramic capacitors. Since many are being used in filters it would be good to get ones with a low temperature coefficient like these: https://www.mouser.com/Passive-Components/Capacitors/MLCCs/_/N-bw5rvZ1yzvvqxZscv7Zgjdhub?P=1z0z819Z1yx4avvZ1yx6r6aZ1y9hzxqZ1yx6r6b film capacitors tend to be more stable and work well in audio circuits, so you can try these: https://www.mouser.com/Passive-Components/Capacitors/Film-Capacitors/_/N-9x371Z1yzvvqxZscv7Zgjdhub?P=1z0z819Z1z0z7l5Z1yx4avvZ1yx4avuZ1yo18i8Z1yx4attZ1yx4atu Or these if you want to stick to axial models: https://www.mouser.com/Passive-Components/Capacitors/Film-Capacitors/_/N-9x371Z1yzvvqxZscv7Zgjdhub?P=1z0z819Z1yx4avvZ1yx4avuZ1yx4attZ1yx4atuZ1yx4hjoZ1yx4ariZ1yx4as7 |
| Otto Olsen:
Hi !! yes this is correct, they look like a 1/4w film resistor, but are ceramic caps, and they are damn impossible to find online! no pictures, no one for sale,no data on them, or who made them. i have found 1 cut out picture with to types,and the look is the same on the outside, but the ceramic core is diffrent, ofcorse GK who made the amp knows, but asking them, well i think i know the outcom of that. i have been looking at the mouser caps before, and they have many types that may be a replacement part, some of them quite expensive . thank you very much for the information, all ideas are most welcome :-+ Best Regards Otto |
| tooki:
--- Quote from: Otto Olsen on February 12, 2020, 10:14:49 pm ---Hi !! yes this is correct, they look like a 1/4w film resistor, but are ceramic caps, and they are damn impossible to find online! no pictures, no one for sale,no data on them, or who made them. --- End quote --- What are you talking about? Did you not see my post where I checked Digi-Key and found they have 330 values of axial ceramic caps in stock right now?!? |O |
| floobydust:
About the old caps, they are Japanese made part, Murata or Matsushita popular in the 1980's. Don't use X7R for low distortion audio, the dielectric's properties are not great. I would measure the old caps lead spacing and replace with boxed film caps. Polyester or polypropylene but they are larger. More discussion was here: https://www.eevblog.com/forum/beginners/capacitor-looks-like-a-resistor/msg1429403/#msg1429403 |
| Navigation |
| Message Index |
| Next page |
| Previous page |