From: "Gerry" 
Subject: RE: [drakelist] AC-4 Cap values






_______________________





 





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:
> 
> Carl Strode <crstrode{at}charter.net>">mailto:crstrode{at}charter.net">crstrode{at}charter.net>
made an utterence to the 
> drakelist gang
> =
----------------------------------------------------------------------
> I have completed re-capping the AC-4.
> 
> After looking at the actual caps installed, and comparing it to my =

> supply of modern electrolytics, I have replaced the 40 mfd caps =

> (shown  as 40 mfd on most schematics) with 33 mfd.
> 
> The HV filter caps were replaced with 150 mfd 450 volt units.  =
( I 
> had a  bunch of these laying around).
> 
> Since my original late model AC-4 had a 100 mfd cap installed at C3 =

> and  C4a, and an 80 mfd cap installed at 
C4b,  I =
decided
to  keep 
> everything  simple and replace these with 150 mfd caps as =
well. 
I'll save all 
> of my  82 and 100 mfd caps for some other project.
> 
> The 150 mfd caps I have are circuit board mount types, with both =

> leads  on one end.  This made installation above decks a
snap.  I removed 
> the  old caps, and then reamed out one of the holes used for =
the old
cap 
>
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 When I was finished, there was =
essentially no
ripple at all!  only 
> about a tenth of a volt on the 650 and the 250 volt, and about
0.2volts on 
> the bias supply.  Oh yes, as usual nowadays, the 650 is =
really
closer to 
> 700, and the  250  is about 
290.  When =
the power
supply is switched 
> on, it thunks a bit harder than it used to, due to the lack of =
leaky 
> caps and the increased cap values.  The supply is much =
stiffer
than 
> before. Very little sag and absolutely no detectable hum.
> 
> I guess this demonstrates that with brute force, we don't need no =

> steenkin regulators!
> >
----------------------------------------------------------------------
> On Behalf of Carl Strode <crstrode{at}charter.net>">mailto:crstrode{at}charter.net">crstrode{at}charter.net>
>
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