In article , Phil
Allison scribeth thus
tony sayer wrote:

-------------------

Still worth some new caps you can get 4700 uF in where the 2000 uF's
used to go..

Bet PW would have used them had they been around



** Maybe not.

If you are using Quad ESL57s, the output cap can interact with the transformer
and create series resonance - hence a very low impedance at a sub sonic
frequency. Bad news when using a TT.

One reason why the 303 has a HPF built in.


My mistake Phil meant to mention the power supply side...
.... Phil


..... Phil

--
Tony Sayer

In article , Phil
Allison scribeth thus
tony sayer wrote:

----------------------



** Calender age is not the main factor, hours of usage and internal temp is.

Well some gear gets more use than others!


I see electros regularly that are 40 or 50 years old and PERFECT.

Anyone actually got a 303 with the originals therein?...


** Plowman says HE does.

Did you miss that?


.... Phil

Did see that but as regards the caps in the 303 they did tend to leak
and spew their electrolyte onto the PCB's, hence the mounting the other
way up method.

Must have done 20 or more of them over time!...

Still a useful little amp


--
Tony Sayer

In article , Dave Plowman (News)
scribeth thus
In article ,
tony sayer wrote:
In article , Dave Plowman (News)
scribeth thus
In article ,
tony sayer wrote:
* Any gear older then say 10 - 15 years electros are very big
contenders for changing especially in output couplers and power
supply rails like the old Quad 303, are there any UN-upgraded ones
left now;?.

Yes. My 303 is 1970, and never been opened up. Not in regular use now -
but did rig it up the other day for a party elsewhere. Sounded as
normal. It was in daily use up until about 5 years ago.


Still worth some new caps you can get 4700 uF in where the 2000 uF's
used to go..

Why would I replace caps on an amp that still sounds OK? No audible hum.

Falling capacity and a tendency to leak as per previous post!..

Bet PW would have used them had they been around


http://www.net-audio.co.uk/quad303caps.html


--
Tony Sayer