[maxhifi]

Hi,

I haven't posted here for a while, but does anyone have a schematic for a
Phase Linear 4000, or perhaps some knowledge of how to fix one? It's a lot
more complex than one would expect a preamp to be! The autocorrelator
function has stopped workign normally, and makes a loud rushing sound!

[Trevor Wilson]

"maxhifi" wrote in message
news:NhyXh.125026$aG1.81693@pd7urf3no...
Hi,

I haven't posted here for a while, but does anyone have a schematic for a
Phase Linear 4000, or perhaps some knowledge of how to fix one? It's a lot
more complex than one would expect a preamp to be! The autocorrelator
function has stopped workign normally, and makes a loud rushing sound!

**Before you do anything, remove all the daughter cards and carefully clean
each and every connector (plug and socket). It is one Hell of a big job and,
IMO, not worth the effort, as the 4000 is a piece of crap. After you clean
the connectors, you will have probably solved the underlying problem. Dump
it and buy a decent preamp. The autocorrellator was a wank anyway.


--
Trevor Wilson
www.rageaudio.com.au



--
Posted via a free Usenet account from http://www.teranews.com

[Eeyore]

Trevor Wilson wrote:

"maxhifi" wrote in message

Hi,

I haven't posted here for a while, but does anyone have a schematic for a
Phase Linear 4000, or perhaps some knowledge of how to fix one? It's a lot
more complex than one would expect a preamp to be! The autocorrelator
function has stopped workign normally, and makes a loud rushing sound!

**Before you do anything, remove all the daughter cards and carefully clean
each and every connector (plug and socket). It is one Hell of a big job and,
IMO, not worth the effort, as the 4000 is a piece of crap. After you clean
the connectors, you will have probably solved the underlying problem. Dump
it and buy a decent preamp. The autocorrellator was a wank anyway.

What's the obsession with obsolete antiques anyway ?

One might also want to replace all the electrolytic caps too.

Graham

[Trevor Wilson]

"Eeyore" wrote in message
...


Trevor Wilson wrote:

"maxhifi" wrote in message

Hi,

I haven't posted here for a while, but does anyone have a schematic for
a
Phase Linear 4000, or perhaps some knowledge of how to fix one? It's a
lot
more complex than one would expect a preamp to be! The autocorrelator
function has stopped workign normally, and makes a loud rushing sound!

**Before you do anything, remove all the daughter cards and carefully
clean
each and every connector (plug and socket). It is one Hell of a big job
and,
IMO, not worth the effort, as the 4000 is a piece of crap. After you
clean
the connectors, you will have probably solved the underlying problem.
Dump
it and buy a decent preamp. The autocorrellator was a wank anyway.

What's the obsession with obsolete antiques anyway ?

**Who knows? When it was new, the 4000 was crap. 30 years on, it is old
crap.


One might also want to replace all the electrolytic caps too.

**Indeed, but it will probably be the connectors that are causing the
problem. There's a lot of them and that cheapskate Bob Carver didn't bother
with gold plating anything.


--
Trevor Wilson
www.rageaudio.com.au



--
Posted via a free Usenet account from http://www.teranews.com

[maxhifi]

"Trevor Wilson" wrote in message
.. .

"Eeyore" wrote in message
...


Trevor Wilson wrote:

"maxhifi" wrote in message

Hi,

I haven't posted here for a while, but does anyone have a schematic
for a
Phase Linear 4000, or perhaps some knowledge of how to fix one? It's a
lot
more complex than one would expect a preamp to be! The autocorrelator
function has stopped workign normally, and makes a loud rushing sound!

**Before you do anything, remove all the daughter cards and carefully
clean
each and every connector (plug and socket). It is one Hell of a big job
and,
IMO, not worth the effort, as the 4000 is a piece of crap. After you
clean
the connectors, you will have probably solved the underlying problem.
Dump
it and buy a decent preamp. The autocorrellator was a wank anyway.

What's the obsession with obsolete antiques anyway ?

**Who knows? When it was new, the 4000 was crap. 30 years on, it is old
crap.


One might also want to replace all the electrolytic caps too.

**Indeed, but it will probably be the connectors that are causing the
problem. There's a lot of them and that cheapskate Bob Carver didn't
bother with gold plating anything.


--
Trevor Wilson
www.rageaudio.com.au



--
Posted via a free Usenet account from http://www.teranews.com


Thanks guys.... I took it apart, and cleaned everything - traced problem to
a bad electrolytic cap. I can't believe how lucky I was finding it, as it
was the first one I replaced, and this unit has dozens of them. I intend to
replace the rest of them as maintenance, but it will have to wait a little
bit.

Why am I fixing it?? It's not really mine, I'm doing it as a favour for a
friend. In my system it sounds alright. A touch sharp sounding, but not bad.
The correlator works reasonably well, it does tend to get rid of tape hiss.

Not one of the connectors was even slightly corroded - the preamp is in
really nice shape. I fixed it for the original owner, who has never felt a
need to change it for something else.