[Test-Equipment] Tek 7904 o-scope, power supply(tantalum caps) ?

[Cmos]

Hi all,

I have a few tek 7904 o-scopes that I am
working on, 3 of them have a power supply
problem, and just click.

I have started on one and found a shorted
big 47uf dipped tantalum cap, on the +17v
supply.
Any one know if this is a common problem ?

I am wondering if the other 2 may have the 
same shorted cap.
Also, I see these cost 4 to 5$, not so cheap if
I am replaceing 2 of them, in and 3 scopes.
Was wondering about useing a low esr alumunum
cap instead, the esr figures for these are even 
lower then tantalum. And they only cosr about
0.30$, much cheaper.
Dose any one have any experence with this ?

Thanks for any help,
Jim Martz 
 
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Jim Martz,
Home: cmos@shol.com
work: jmartz@maplemountain.com
web: http://www.shol.com/cmos
Wifes page: http://www.shol.com/cmos/amparo