[Johnson] Invader 200 Power Supply components question.

[Kenneth D. Grimm, K4XL]

> Hi all,
> Looking still closer at my Invader I notice what
> appears to be one of the 60uf 450 v electrolytics
> leaking, I am fairly certain that it will need
> replacement.
>
> It seems that 60uf in that voltage is not available
> the closest I can find is either 75uf and 47uf. I am
> wondering if I can use 75uf with out stressing out the
> transformer and choke. I'm dont think the 47uf will be
> large enough but not sure.
> I really want to avoid using 2 caps series or parallel
> to get 60 uf as I would like to swap all 3 of the
> 60's. Has anyone repelaced them in the invader or been
> in a similar situation?
> Thanks again for any help
> Joe

Joe,
You can use the 75uf cap without losing any sleep over it.  Common
electrolytics are typically rated at something like -10 to +100 % of
their marked capacitance.  I wouldn't go with the 47uf since it falls
outside the parameters that the designer maybe/probably had in mind at
the time he came up with the 60uf value.
73,
Ken K4XL
k4xl@arrl.net
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