Refurbish Quad 606 power amp?
anthony
Melbourne in Victoria.
And that means it would be a convenient time to ship my Quad 606 power
amp down in advance to a fellow who advertises on Ebay a Quad
refurbishment service for about $430.
this is what he advertises: my question is whether the general
consensus here is that an amp which has been in continual service for
almost 25 years is due for such a refurbishment, or do people think
'if it ain't broke, don't fix it'!
Attention: This is a service for revising/upgrading your existing 606,
NOT an amplifier for sale.
The Quad 606 was one of the best amplifiers ever made.
Unfortunately after 20 years many components tend to dry out and the
opamp-chips available then were not at all comparable to the quality
of modern components. A revision/upgrade will make your Quad sound
better than ever before:
* All electrolytic capacitors (including those in the power
supply) are replaced by new ones as well as some resistors that are
critical.
* Several other capacitors on the circuit-boards are replaced by
silver-mica or Wima MKS4 capacitors
* The amp can be fully adapted to your speakers and pre-amp or can
be changed to Monoblock on demand.
The perfect functioning of the amp is 100% guaranteed for 6 months
after the revision.
Also see our Blogspot http://quadrevisionspot.blogspot.com/
jwvm
<snip>
> And that means it would be a convenient time to ship my Quad 606 power
> amp down in advance to a fellow who advertises on Ebay a Quad
> refurbishment service for about $430.
> this is what he advertises: my question is whether the general
> consensus here is that an amp which has been in continual service for
> almost 25 years is due for such a refurbishment, or do people think
> 'if it ain't broke, don't fix it'!
There is some merit to that philosophy.
>
<snip>
>
Unfortunately after 20 years many components tend to dry out and the
> opamp-chips available then were not at all comparable to the quality
> of modern components. A revision/upgrade will make your Quad sound
> better than ever before:
>
You are unlikely to hear a real difference with new op amps. You may
get a bit less noise or distortion but it is likely to be very small.
> * All electrolytic capacitors (including those in the power
> supply) are replaced by new ones as well as some resistors that are
> critical.
There is some truth here, especially if there is some power supply
noise (hum) or power output is reduced. Low-frequency response could
also be degraded if coupling capacitors are degraded.
> * Several other capacitors on the circuit-boards are replaced by
> silver-mica or Wima MKS4 capacitors
This is less likely to be useful.
> * The amp can be fully adapted to your speakers and pre-amp or.....
This sounds like a bad idea and it is not clear what modifications
would be made. What if you change speakers or preamp in the future?
>
> The perfect functioning of the amp is 100% guaranteed for 6 months
> after the revision.
>
Only 6 months? In general, you could probably find much better ways to
spend your money.
anthony
> On Oct 26, 10:02=A0am, anthony <anthonyjhcnos...@netscape.net> wrote:
> <snip>
>
> > And that means it would be a convenient time to ship my Quad 606 power
> > amp down in advance to a fellow who advertises on Ebay a Quad
> > refurbishment service for about $430.
> > this is what he advertises: my question is whether the general
> > consensus here is that an amp which has been in continual service for
> > almost 25 years is due for such a refurbishment, or do people think
> > 'if it ain't broke, don't fix it'!
>
> There is some merit to that philosophy.
>
really needed. By then I'll probably be able to upgrade to a good used
99 power amp at a decent price.
ze...@comcast.net
I don't know whats involved mechanically. A bit "high" in price, but
that's "high end".
I see only one op-amp in there and it looks to be used only for
biasing or something like that.
Probably not worth changing it. It should be a LOT cheaper just to
check it for performance.
greg