I changed out the caps in my PS-7 a couple of years back and used caps from
Mouser. Not sure why you're concerned about current rating - that's not a
factor. I think you'll find the caps rated only by voltage and
capacitance - oh yes, and by temperature max. In the PS-7, you ought to
worry more about the physical characteristics. It's nice if you can find
caps of the same diameter so you don't have to change the mounting hardware.
Also, the post height for the terminals is a factor. I can't remember now
whether the original caps had the longer posts or whether or not I ordered
the right height. Before ordering, take everything off of one of the
terminals and measure the height.
My caps have been running several hours per day for a couple of years with
no problems. I may be able to dig out a receipt if you have problems
locating a replacement.
73, Floyd - K8AC
----- Original Message -----
From: "Don Cunningham" <wb5...@martineer.net>
To: "Ron" <wd8...@yahoo.com>; <drakelist@zerobeat.net>
Sent: Wednesday, October 28, 2009 9:42 PM
Subject: Re: [Drakelist] Replacement caps for the PS7
Well, I hope since you asked this, it will bring on one of the "guru's"
that will explain ripple current. I have been seeing that lately, and
this old guy will admit to not knowing what the heck it is!!!! I wouldn't
think you would need the same rating as the power supply current
though!!!! What say experts??? I'm wanting to change out my PS7 caps
too.
73,
Don, WB5HAK
----- Original Message -----
From: "Ron" <wd8...@yahoo.com>
To: <drakelist@zerobeat.net>
Sent: Wednesday, October 28, 2009 8:34 PM
Subject: [Drakelist] Replacement caps for the PS7
Okay before everyone says Heathkit shop like they did last time, note
that the PS7 is the 13.8 volt power supply for the TR7 not the L7 power
supply. I need new filter caps, any thoughts on where and which ones?
I spotted some on mouser, but I can not find their ripple current
ratings. Apparently Mallory has changed numbers slightly and all I can do
is guess given the size above and below that they are about the correct
current rating. On that subject, I presume the ones in the supply are at
least 12 amps each. That would get them close for the 25 Amp constant
current that the supply is suppose to be able to run. With the fan
cooling them, I would think 12 amp caps would be about right.
TNX es 73,
Ron WD8SBB
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