Electrolytic capacitors

[rayfri]

I whole heartedly agree with what Glen says about modern capacitors.
When my friend brought his sb 200 to me for repair because it was popping
the
circuit breakers, I traced the problem to shorted electrolytic caps....
youve seen
the ones in the sb 200 .... same type in the dx 100 and Apache
transmitters...
big cans... 450 v each ....   Anyhow, I called the local parts house and
asked the
price.... then sent my friend to pick them up....  when he got back with
caps that
are about one third the size of the big cans in the sb 200, but same value
and voltage
ratings.... I was shocked.  I was expecting big cans ....  I hadnt replaced
caps in
anything for a long time....
    Anyhow... I put them in and we fired up the linear and it worked just
fine....
By the way.... the caps only cost 6 bucks apiece....
Ray  wa7itz


Glen Zook wrote:

> Virtually all of the modern electrolytic capacitors
> are considerably smaller than the older versions.  You
> can get capacitors from Mouser (www.mouser.com) as
> well as other suppliers for very reasonable cost.
>
> However, you will have to either use longer leads on
> the capacitors to make up for the shorter length, or
> else slightly modify the unit to move the connections
> closer.
>
> As for operation, the modern capacitors will be much
> closer in value than the older ones.  You can buy the
> 20% tolerance capacitors which are much cheaper than
> the 10% tolerance capacitors and be closer in value
> than the originals ever though of being.  Most of the
> original electrolytic capacitors had a tolerance of
> -50% to +80%.  Thus, you really had no idea as to what
> the actual value was.
>
> I use 20% capacitors in all of the equipment that I
> repair for others and haven't had a single problem.
>
> Thus, if you have to, put double backed foam between
> the circuit board and the capacitor to hold it in
> place and then make the leads long enough to fit.
>
> Glen, K9STH
>
> --- Francisco Viegener <fev at CIUDAD.COM.AR> wrote:
>
> I found others Elect.Caps with similar MFD and Voltage
> but they are shorter with the same diameter. Someone
> can make me clear how to choose the less expensive
> that will work and fit inside the SB220.
>
> =====
> Glen, K9STH
>
> Web sites
>
> http://home.attbi.com/~k9sth
> http://home.attbi.com/~zcomco
>
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