Re: Quad 303 capacitors
- From: Jim Lesurf <jcgl@xxxxxxxxxxxxxxxxxx>
- Date: Sun, 15 Jan 2006 09:23:18 +0000 (GMT)
In article <rNDp9LA+WTyDFwTD@xxxxxxxxxxxx>, tony sayer
<tony@xxxxxxxxxxxx>
wrote:
> In article <4de909ade8jcgl@xxxxxxxxxxxxxxxxxx>, Jim Lesurf <jcgl@st-
> and.demon.co.uk> writes
[snip]
> >
> >Curious that net-audio make various other mods, but don't change the
> >o/p caps...
> >
> Dunno wotcha torkin abaht guv!, 'pon me life!!
> Got their kit of bits and changed all the caps inc the ones on the PCB's
> and she sounds and measures fine, and is in daily use by the missus
> driving a pair of 11L's.
Erm... well you may heard a distant "clang" sound since you posted you
reply to me. :-)
When I read the 'net-audio' page on upgrading the 303 I read through the
text and examined the pictures/diagrams. Found what they have very
interesting, but didn't see anything about the o/p caps.
However I'd not bothered to read the bits at the bottom of the webpage.
I'd assumed these were simply a 'price catalogue' for the various
mods/packs they offer.
Having read your reply, I went back and had another look. Lo and behold,
down amongst the list at the bottom of their webpage is a 'capacitor
upgrade' pack which includes 10,000microF o/p caps and also larger than
standard reservoir caps! So the *do* offer this as a mod, but it seems not
to be discussed in the body of the webpage explanations! Maybe, like
myself, it seemed to them to be so 'obvious' as not to be worth even
explaining. :-)
Anyway, I can now largely retract what I'd said about them apparently not
considering this. The have, and it does look like a sensible mod to me,
unless the user has speakers that keep a relatively high impedance in the
low bass region.
> Now it was about a year or so ago since I did this but I swear that the
> OP ands PSU caps were all changed up to 4700 mfd ones and some
> seemingly exotic make they were too. The PSU are two in parrelled so a
> total of 9400 mfd in the PSU reservoir.
> I suspect that in 1967 or when this one was built they didn't have ones
> bigger than what were available so they didna put bigger ones in 'cos
> they wouldna fit, or so it seems.
> Anyways, very worth while mod and given the old girl a new lease of
> life. Also changed some of the wiring for summate a bit thicker and
> changed the input and output sockets for something almost "kosher" QUAD
> so all in all very worthwhile doing:)
> I seem to remember it was producing sensible levels into a 8 ohm
> resistive load down to somewhere around 20 hertz or maybe lower so no lo
> roll off.
My curiosity was partly prompted by my (temporarily) using a 303 to drive a
pair of ESL63's. These drop below 4 Ohms at some frequencies.
I note that Quad showed 16Ohm and 8Ohm response plots in their literatuire
for the 303, but (tactfully) avoided showing any for 4Ohms. :-)
Slainte,
Jim
--
Electronics http://www.st-and.ac.uk/~www_pa/Scots_Guide/intro/electron.htm
Audio Misc http://www.st-and.demon.co.uk/AudioMisc/index.html
Armstrong Audio http://www.st-and.demon.co.uk/Audio/armstrong.html
Barbirolli Soc. http://www.st-and.demon.co.uk/JBSoc/JBSoc.html
.
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- From: Jim Lesurf
- Re: Quad 303 capacitors
- From: tony sayer
- Quad 303 capacitors
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