I admit I did not consider the ripple current parameter. The original
Mallory CGSs are rated at 2.9A, 85C. The GU-series Nichicons are rated at
1.85A, 105C. Not too different. I will be the test case for longevity.
The originals lasted only 18 years.
I also found that Nichicon makes a high ripple current cap, series GW. This
one is rated at 2.65A, 105C and, strangely, is slightly _smaller_ than the
ones I used.
73,
John, W1JA
----- Original Message -----
From: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>
To: <tentec@contesting.com>
Sent: Tuesday, February 19, 2008 10:04 PM
Subject: Re: [TenTec] Titan 425 shelved for 10 years
> I am reluctant to use the physically smaller Nichicon capacitors because
> I believe them to be rated for a much smaller ripple current and I fear
> they will overheat in the transmitter power supply. A power supply
> running an amp load requires lots of ripple current in the filter
> capacitors, especially if the power supply is a voltage doubler as many
> ham PAs are. Look up the data sheets on the computer grade vs the
> Nichicon capacitors. The large physical size for the capacitance is why
> I like the TVA atoms for axial lead capacitors for better heat
> dissipation over the super small off shore capacitors. When I've checked
> data sheets for ripple current ratings, the super small capacitors have
> been lacking.
>
>
> 73, Jerry, K0CQ
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