ANTIQUE-RADIO-LAB
Welcome, please log-in to participate in this (your) forum, by logging in you agree to abide by the rules of this forum. Until you make your FIRST Login and post, you cannot PM a Member.
ANTIQUE-RADIO-LAB

Antique Radio Forum for Collectors antique-radio-lab.forumotion.com
 
HomeRegisterLog inSearchPublications
Posting Questions, Please supply ALL the details you have.
In order for Us to answer if We can!: You will need to provide Details,
such as 1-Brand Name of the Radio 2-chassis number 3-Model number 4-symptoms.5 Photo's

 

 Electrolytic Capacitor info

Go down 
AuthorMessage
FrankB
Moderator
Moderator
FrankB


Join date : 2010-11-22

Electrolytic Capacitor info Empty
PostSubject: Electrolytic Capacitor info   Electrolytic Capacitor info I_icon_minitimeApril 27th 2018, 9:57 pm

There are different temperature ratings on Electrolytics.
 85C and 105C

Now, most of the older TV sets and radios used the 85C parts. Often they were right next to heatsinks. They failed a lot.
This was due to the combination of heat, quality of part and the fact that many mfg. ran the capacitors to their max voltage ratings.

 If you are experimenting, I think that the 85c caps are OK to use, but if it's going to be a project or repair you want to last, use the 105c rated caps and go UP one voltage rating, as insurance.
 The only 2 things to going up in voltage ratings are:
1. They cost a few pennies more.
2. In a few instances, the quality, higher voltage 'lytics may be a bit larger physically than the lower voltage rated ones. I have found 98% of the time, I can easily make the higher voltage rated one work.

If you want a real eye opener, lookup the mfgr. data sheets on 'lytic types. Many only have a 1000 hr. rating before failure!!!

Yes, you can use a thru hole type in place of a smt, if you have the room, and vice versa, in a pinch. This depends on the voltage rating, of course.

As always, before use, be sure to check the 'lytic for ESR, voltage breakdown, and capacitance before installing.

NOTE:
The new digital capacitance meters do not put enough voltage out to see if a capacitor, regardless of type, fixed or 'lytic at  100v, 200v, etc. has leakage at close to the rated voltages.

Personally, I use an ESR meter- (Capacitor Wizard with the overload kit mod, as I found I can tell a lot more with a meter type ESR unit than the LED digital ones, and its useful for checking intermittent or bad solder connections too); an old Eico eye type cap meter for voltage test- (I like the one with the voltage adjustable pot, not the switched voltage ranges), and a digital capacitance meter for the high MFD ratings in the new solid state equipment.


Buy from a trusted source too. Often the "cheap import" caps are counterfeit, or way out of tolerance. They may be really old stock too, which if a 'lytic will need reforming before use.

Nothing is more irritating than buying a new part, putting it in, then spending hours of trouble shooting only to find the new part is bad. That's why I check all parts first regardless if its a capacitor, resistor, diode, xistor, etc.
Back to top Go down
 
Electrolytic Capacitor info
Back to top 
Page 1 of 1
 Similar topics
-
» Electrolytic Capacitors
» Capacitor question
» Capacitor Values
» Capacitor types
» Why the high voltage capacitor in an AA5?

Permissions in this forum:You cannot reply to topics in this forum
ANTIQUE-RADIO-LAB :: Radio Repair Bench :: Radio parts, Tools, and supplies. :: Capacitors-
Jump to: