Subject: Re: [drakelist] AC-4 Cap values
From: k5vkl{at}juno.com

and also a slight change in the secondary output winding in the power<=
/DIV>
transformer secondaries would cost too much to add into the equipment<=
/DIV>
price.
 
Anyhow, and Meanwhile, back at the Ranch
(as "they" say,=20
somewhere)
keep up the good work, and keep us posted.
 
Bill Flowers  
K5VKL   
    
_______________________
 
On Wed, 02 Mar 2005 20:37:21 -0800 Carl Strode <crstrode{at}charter.net>">mailto:crstrode{at}charter.net">crstrode{at}charter.net>
writes:<=
BR>>=20
> Carl Strode <crstrode{at}charter.net>">mailto:crstrode{at}charter.net">crstrode{at}charter.net>
made an=20
utterence to the > drakelist gang>=20
----------------------------------------------------------------------&=
gt; I=20
have completed re-capping the AC-4.> >
After looking at the =
actual=20
caps installed, and comparing it to my > supply of modern =
electrolytics,=20
I have replaced the 40 mfd caps > (shown  as 40
mfd on most=20
schematics) with 33 mfd.> > The HV filter
caps were replaced =
with=20
150 mfd 450 volt units.  ( I > had a 
bunch of these =
laying=20
around).> > Since my original late model
AC-4 had a 100 mfd =
cap=20
installed at C3 > and  C4a, and an 80 mfd cap
installed at =
;=20
C4b,  I decided to  keep >
everything  simple and =
replace=20
these with 150 mfd caps as well.  I'll save all >
of my  =
82 and=20
100 mfd caps for some other project.> >
The 150 mfd caps I =
have=20
are circuit board mount types, with both > leads 
on one end.&=
nbsp;=20
This made installation above decks a snap.  I removed
> the&=
nbsp;=20
old caps, and then reamed out one of the holes used for the old cap
>=
;=20
____________          &=
nbsp;       =20
__________________         &=
nbsp;       =20
________________
 When I was finished, there was essentially no ripple
at all!&=
nbsp;=20
only > about a tenth of a volt on the 650 and the
250 volt, and=
=20
about 0.2volts on > the bias supply.  Oh
yes, as usual=20
nowadays, the 650 is really closer to > 700, and
the  250&=
nbsp;=20
is about  290.  When the power supply is switched
> on,&=
nbsp;it=20
thunks a bit harder than it used to, due to the lack of leaky >=20
caps and the increased cap values.  The supply is much stiffer =
than=20
> before. Very little sag and absolutely no
detectable hum.=
>=20
> I guess this demonstrates that with brute force, we don't need no=
=20
> steenkin regulators!> >=20
----------------------------------------------------------------------&=
gt;=20
On Behalf of Carl Strode <crstrode{at}charter.net>>=20">mailto:crstrode{at}charter.net">crstrode{at}charter.net>>=20
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