[Vintage-Audio] Re: 'Lytic caps needed for Scott amp.

[Rick Larson]

Phil,

> Hi Chuck
> Thank you for the info.  If it comes down to that and the originals don't
> "form" up well then I'll just tell the owner "no go" as I told him up front
> that I don't "do cans" 8^)

Another thought.  When I restored an old Mac I had one of the two cans
go bad.  I left both cans in but didn't connect any wires to the bad one.

Then I added individual caps underneath the chassis to make up the
ones in the can.  I don't know how much room you have but looking
at your requirements, I wonder if you can do something similar to
at least a couple of replacements.

The 25uF/25VDC caps are pretty small and if you use radial ones, you
can move them around.  The 500VDC caps are pretty long so it might be
tough to fit these underneath.

Also, depending how these are used (power supply) and where (right after
tube rectifier, after choke, ...) you may not need *exact* capacitance,
but can use something higher.  This might make finding replacements easier.

I have found sites showing how to cut open a can, remove the bad caps,
add new ones and seal up again.  I never liked the idea cutting them up
but it might be the only ticket where space is at a premium.  Or you don't
like the looks of individual caps mounted on a small board above the chassis.

Have fun,
rick
--
Minneaplis
 
> 73 de Phil  KO6BB
> 
> > None of these cans have been available for years, probably decades. These
> > were also custom made units for H.H.Scott, and not "off the shelf" units.
> > The ONLY way to solve this problem is to remove the contents of the cans,
> > and rebuild them using individual components. This issue is one of the
> major
> > reasons why these old Scott units, which sound great when working up to
> par,
> > have so little resale value.
> > Chuck N1LNH ( H.H. Scott employee 1970 )
> > -----Original Message-----
> > From: Philip Atchley <k06bb@elite.net>
> > To: vintage-audio@mailman.qth.net <vintage-audio@mailman.qth.net>
> > Date: Tuesday, June 11, 2002 6:40 PM
> > Subject: [Vintage-Audio] 'Lytic caps needed for Scott amp.
> >
> >
> > >Hello
> > >Overhauling a Scott amplifier for a friend.  As some of the 'lytics have
> > >leaked & bulged the seals slightly we wish to replace all 'lytics for
> long
> > >term reliability (shipping back and forth via UPS gets expensive).
> > >
> > >Need a source the following.   ALL are FP can types and a 'small'
> increase
> > >in values shouldn't hurt anything.  There are 16 components and 25 wires
> > >connected to these cans and  there is no room under the chassis to mount
> > >terminal strips and radial caps (except perhaps for a couple of the
> 25Volt
> > >units etc)..
> > >
> > >NOTE:  AES is out of stock on all 500 Volt FP caps and have no idea when
> > >they might get more (due to manufacturing problems).
> > >
> > >1.  30uF/30uF at 500 VDC, FP style Can.  Need 2.
> > >2.  20uF/450VDC, 20uF/450VDC, 25uF/25VDC, 25uF/25VDC, FP Can.  Need 1.
> > >3.  100uF, 100 uF, 100uF, 100 uF at 75VDC, FP Can.    Need 1.
> > >
> > >73 de Phil  KO6BB
[snip]