[TenTec] Titan 425 shelved for 10 years

[John Pelham]

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 at storm.weather.net>
To: <tentec at 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