I got my amp's schematic sheet and for every cap or resistor there is a number, for example c29 0.001 is a cap.
Is there a way i can buy a component by part number? or how does it work?
Is there a way i can buy a component by part number? or how does it work?
fractions are usually uf. uf is the modern way to abbreviate microfarads, before 1980? microfarads was usually abbreviated mf. .0002 uf 1960's style is now sold as 200 nf. 1-900 can be uf if power supply cap or input coupler cap, if a roll off or filter cap more likely to be nf (nanofarads). RF bypass caps are 1-900, usually in pf. If you make the cap voltages higher than the power supply voltage, you will be safe, usually. Good luck.
If you want more guidance, scan and post your schematic, and we'll guess which cap is which function.
If you want more guidance, scan and post your schematic, and we'll guess which cap is which function.
Last edited:
Surplus and sixties manufactured caps in the .0002 mf size etc ( 200 nf) will be rolled paper or plastic film. nanofarad caps can be disc, which is usually ceramic, or rolled film. John curl hates ceramic disc caps for audio coupling and filtering, has some data to prove his adversion, so buy film ones to make him happy. ceramic disk is mostly for radios, power supply bypass, picofarad ones for RF oscillation prevention. I've used ceramic disc in violation of his rules, but I used 50V ones where the signal was probably under a volt, so probably the non-linearities were swamped by the huge voltage rating. 50V ceramic disk caps aren't cheap, but they are so tiny it is cool to put them where electrolytics used to go and never do it again..
- Status
- Not open for further replies.