On Feb 20, 2005, at 1:28 PM, Barry Norman wrote:
> Hello all,
>
> It's finally time for me to replace the original filter caps in my
> SB221. A
> few questions:
>
> 1) Total capacitance with stock caps are 25uF (8 200uF in series),
> should I
> increase capacitance to minimize voltage drop under load?
Hello, Norm === It won't make all that much difference if you use more
C, but Heathkit was not known for using a surplus of filter-C.
>
> 2) Are the 105C rated caps worth the extra few bucks over the 85C?
Not if you have terminal cancer.
>
> 3) Are the different series choices only a reflection of the temp
> ratings or
> are there other differences as well?
You can buy Panasonic's low-ESR, long-life 105ºC units for little $$
extra. Digikey is a good source.
>
> Note: I've already replaced stock equalizing resistors with 100Ks. Also
> using a Peter Dahl replacement HV transformer.
Did you add a stepstart?
>
> Thanks for your suggestions,
>
> Barry Norman KF4WGR
>
>
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>
Richard L. Measures, AG6K, 805.386.3734. www.somis.org
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