Carver 4.0T Amp Problem

[John York]

Hi guys.
This amp is 12 or 13 years old. I have noticed that the highs and
midrange are starting to sound a bit scratchy. I thought it was the
speakers at first, but I tried another amp source they sound good.
Is it time for me to get a new amp? Or does this sound like something
that I might be able to have fixed, or fix myself if not real
involved. Or is it worth it.
The tuner/preamp is a Carver CT7. I haven't bypassed that yet to see
if that could be the culprit. But from what I have been reading in the
group it is probably in the amp.
Thanks for any advice.
John York
Remove (nospam) to reply by e-mail
jkidless(nospam)@rcn.com

 

[Jerry G.]

You may not be able to service this yourself, but it is serviceable by
someone who is used to working on these. The tech would start by verifying
the performance of the power supply, and then by feeding it a low distortion
set of tones from an audio gen, and use his scope to find where the defects
are. It is possible to be anything from warn caps to some other types of
parts that are off value from age and use.

--

Greetings,

Jerry Greenberg GLG Technologies GLG
=========================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
=========================================


"John York" <jkidlessNOSPAM@rcn.com> wrote in message
news:ebg240tk6qlnhbfgq4crm9kn6ibh4q4sha@4ax.com...
Hi guys.
This amp is 12 or 13 years old. I have noticed that the highs and
midrange are starting to sound a bit scratchy. I thought it was the
speakers at first, but I tried another amp source they sound good.
Is it time for me to get a new amp? Or does this sound like something
that I might be able to have fixed, or fix myself if not real
involved. Or is it worth it.
The tuner/preamp is a Carver CT7. I haven't bypassed that yet to see
if that could be the culprit. But from what I have been reading in the
group it is probably in the amp.
Thanks for any advice.
John York
Remove (nospam) to reply by e-mail
jkidless(nospam)@rcn.com

 

[Stephen Sank]

Any Carver amp that doesn't have flames shooting out of it is miraculously healthy. Seriously.
That said, I'll offer the suggestion that it may be that your amp's bias adjustment trimmer
potentiometers need replacing. Carver, as always, used the cheapest parts possible, so I have
seen many instances of those bias pots flaking out & shutting down the bias, causing large
amounts of distortion.

--
Stephen Sank, Owner & Ribbon Mic Restorer
Talking Dog Transducer Company
http://stephensank.com
5517 Carmelita Drive N.E.
Albuquerque, New Mexico [87111]
505-332-0336
Auth. Nakamichi & McIntosh servicer
Payments preferred through Paypal.com
"John York" <jkidlessNOSPAM@rcn.com> wrote in message
news:ebg240tk6qlnhbfgq4crm9kn6ibh4q4sha@4ax.com...

Hi guys.
This amp is 12 or 13 years old. I have noticed that the highs and
midrange are starting to sound a bit scratchy. I thought it was the
speakers at first, but I tried another amp source they sound good.
Is it time for me to get a new amp? Or does this sound like something
that I might be able to have fixed, or fix myself if not real
involved. Or is it worth it.
The tuner/preamp is a Carver CT7. I haven't bypassed that yet to see
if that could be the culprit. But from what I have been reading in the
group it is probably in the amp.
Thanks for any advice.
John York
Remove (nospam) to reply by e-mail
jkidless(nospam)@rcn.com

 

[Bob Urz]

John York wrote:

Hi guys.
This amp is 12 or 13 years old. I have noticed that the highs and
midrange are starting to sound a bit scratchy. I thought it was the
speakers at first, but I tried another amp source they sound good.
Is it time for me to get a new amp? Or does this sound like something
that I might be able to have fixed, or fix myself if not real
involved. Or is it worth it.
The tuner/preamp is a Carver CT7. I haven't bypassed that yet to see
if that could be the culprit. But from what I have been reading in the
group it is probably in the amp.
Thanks for any advice.
John York
Remove (nospam) to reply by e-mail
jkidless(nospam)@rcn.com
I had one carver of that vintage in the shop that drove me nuts. One

channel seemed to be dead. Took the unit apart and put the scope on
both channels internally. All was OK. This was not a output relay
problem. I traced good signal all the way to the speaker output
terminal block.

There was some oxidation or such on the output terminals screws keeping
it from making connection. I was at a loss to explain it. I kept the
terminal around to remind me of it. A new terminal fixed the problem.

Bob



-----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
-----== Over 100,000 Newsgroups - 19 Different Servers! =-----