amplifier Popping

[mrocus]

Had a call from a friend in QLD, one of the amps in his studio setup makes a
popping sound when it is turned off.
He has 5 amplifiers same manufacturer, 4 are okay.

I have been out the repair business for a number of years, so I am abit
rusty these days. The grey hair and the grey matter don't help - G!


Any suggestions on a fix. or where to look

If I had the amp in front of me, I would do the normal checks ; voltages;
hairline cracks in the pcb, transistors gone into high gain, noisy resistors
and caps, blah blah.

He has just sent me a circ diag, blimey these amps are old, they are in an
electronic organ installation.

 

[Phil Allison]

"mrocus" <silent@example.com>

Had a call from a friend in QLD, one of the amps in his studio setup makes
a
popping sound when it is turned off.
He has 5 amplifiers same manufacturer, 4 are okay.

I have been out the repair business for a number of years, so I am abit
rusty these days. The grey hair and the grey matter don't help - G!

Any suggestions on a fix. or where to look

If I had the amp in front of me, I would do the normal checks ; voltages;
hairline cracks in the pcb, transistors gone into high gain, noisy
resistors
and caps, blah blah.

He has just sent me a circ diag, blimey these amps are old, they are in
an
electronic organ installation.

** Amps that are switched off do not actually work.

There is therefore no problem to fix.

The bill for my consultation is in the mail.





............. Phil

 

[Rheilly Phoull]

"mrocus" <silent@example.com> wrote in message
news:40277dd7$1@news.comindico.com.au...

Had a call from a friend in QLD, one of the amps in his studio setup makes
a
popping sound when it is turned off.
He has 5 amplifiers same manufacturer, 4 are okay.

I have been out the repair business for a number of years, so I am abit
rusty these days. The grey hair and the grey matter don't help - G!


Any suggestions on a fix. or where to look

If I had the amp in front of me, I would do the normal checks ; voltages;
hairline cracks in the pcb, transistors gone into high gain, noisy
resistors
and caps, blah blah.

He has just sent me a circ diag, blimey these amps are old, they are in
an
electronic organ installation.


mebbe a cap across the mains switch for a start ??

--
Regards ........ Rheilly Phoull

 

[mrocus]

Oh Dear!

I think I remember you,

one of my apprentices of 30 years ago. -))


"Phil Allison" <philallison@optusnet.com.au> wrote in message
news:402780ec$0$4260$afc38c87@news.optusnet.com.au...

"mrocus" <silent@example.com


Had a call from a friend in QLD, one of the amps in his studio setup
makes
a
popping sound when it is turned off.
He has 5 amplifiers same manufacturer, 4 are okay.

I have been out the repair business for a number of years, so I am abit
rusty these days. The grey hair and the grey matter don't help - G!

Any suggestions on a fix. or where to look

If I had the amp in front of me, I would do the normal checks ;
voltages;
hairline cracks in the pcb, transistors gone into high gain, noisy
resistors
and caps, blah blah.

He has just sent me a circ diag, blimey these amps are old, they are in
an
electronic organ installation.



** Amps that are switched off do not actually work.

There is therefore no problem to fix.

The bill for my consultation is in the mail.





............ Phil

 

[mrocus]

thanks for that, I will forward him all of the replies - well the
intelligent ones anyway.

for some one to have their bill in the mail is pretty sus; is this person
really a pelican and what is the name of the male. see I can be just as
silly. - Phil


"Rheilly Phoull" <Rheilly@bigpond.com.au> wrote in message
news:c07vel$12t8ol$1@ID-151145.news.uni-berlin.de...

"mrocus" <silent@example.com> wrote in message
news:40277dd7$1@news.comindico.com.au...
Had a call from a friend in QLD, one of the amps in his studio setup
makes
a
popping sound when it is turned off.
He has 5 amplifiers same manufacturer, 4 are okay.

I have been out the repair business for a number of years, so I am abit
rusty these days. The grey hair and the grey matter don't help - G!


Any suggestions on a fix. or where to look

If I had the amp in front of me, I would do the normal checks ;
voltages;
hairline cracks in the pcb, transistors gone into high gain, noisy
resistors
and caps, blah blah.

He has just sent me a circ diag, blimey these amps are old, they are in
an
electronic organ installation.


mebbe a cap across the mains switch for a start ??


--
Regards ........ Rheilly Phoull

 

[Phil Allison]

"mrocus" <silent@example.com>

thanks for that, I will forward him all of the replies - well the
intelligent ones anyway.

** The selection process is really quite beyond you.

for some one to have their bill in the mail is pretty sus;

** A "sus" query deserves a "sus" bill.

is this person really a pelican and what is the name of the male.

** A pelican is a strange bird - its beak can hold more than its belly
can.

see I can be just as silly. - Phil

** For sure - but not one tenth as smart.




........... Phil

 

[mrocus]

Now Phil,

I heard that you turned out to be a fine technician, however, even after 4
years training you still can't spell Ridicule!

MR

"Phil Allison" <philallison@optusnet.com.au> wrote in message
news:402787ab$0$29129$afc38c87@news.optusnet.com.au...

"mrocus" <silent@example.com

thanks for that, I will forward him all of the replies - well the
intelligent ones anyway.


** The selection process is really quite beyond you.


for some one to have their bill in the mail is pretty sus;


** A "sus" query deserves a "sus" bill.


is this person really a pelican and what is the name of the male.


** A pelican is a strange bird - its beak can hold more than its belly
can.


see I can be just as silly. - Phil


** For sure - but not one tenth as smart.




.......... Phil

 

[Phil Allison]

"mrocus" <silent@example.com>

Now Phil,

I heard that you turned out to be a fine technician, however, even after 4
years training you still can't spell Ridicule!

** One can train a pelican to dance - other dumb animals too.

You can lead a horse to water - but not make him drink.

Shutting an asshole up on usenet is more difficult than you think.




.......... Phil

 

[mrocus]

Someday you are a pigeon and someday you are a statue!

No shutting up, this is a democracy, everyone can say what they LICK!

That reminds me, I must make some shmegma sandwiches for morning tea, the
staff love them.

Cheers Phil



"Phil Allison" <philallison@optusnet.com.au> wrote in message
news:40279097$0$4255$afc38c87@news.optusnet.com.au...

"mrocus" <silent@example.com

Now Phil,

I heard that you turned out to be a fine technician, however, even after
4
years training you still can't spell Ridicule!


** One can train a pelican to dance - other dumb animals too.

You can lead a horse to water - but not make him drink.

Shutting an asshole up on usenet is more difficult than you think.




......... Phil

 

[Mark Harriss]

mrocus wrote:

Oh Dear!

I think I remember you,

one of my apprentices of 30 years ago. -))

Snigger Snigger!

 

[Mark van der Eynden]

"mrocus" <silent@example.com> wrote in message news:<40277dd7$1@news.comindico.com.au>...

If I had the amp in front of me, I would do the normal checks ; voltages;
hairline cracks in the pcb, transistors gone into high gain, noisy resistors
and caps, blah blah.

'transistors gone into high gain'? My my, we have been out of the game

for a few years.

And I'm not to sure what most likely is a dead cap across the mains
switch has to do with any of the other checks either.

 

[mrocus]

Many years now, been a software engineer for over 20 years.

Couldn't keep lugging heavy equipment around.

Hence the original post.


Cheers
MR

"Mark van der Eynden" <mvandere@iprimus.com.au> wrote in message
news:48ed3358.0402091921.654e9a10@posting.google.com...

"mrocus" <silent@example.com> wrote in message
news:<40277dd7$1@news.comindico.com.au>...
If I had the amp in front of me, I would do the normal checks ;
voltages;
hairline cracks in the pcb, transistors gone into high gain, noisy
resistors
and caps, blah blah.

'transistors gone into high gain'? My my, we have been out of the game
for a few years.

And I'm not to sure what most likely is a dead cap across the mains
switch has to do with any of the other checks either.

 

[Phil Allison]

"mrocus" <silent@example.com>

Many years now, been a software engineer for over 20 years.

** That explains a lot.




.......... Phil

 

[mrocus]

Phil,

you rang me last Saturday night, and asked me to come over to one of your
booze parties, I didn't want to go, so I told you I had a case of diarrhoea.
You said bring it over, these fools will drink anything!. Aw Phil, you are
disgusting!


"Phil Allison" <philallison@optusnet.com.au> wrote in message
news:4028b524$0$18303$afc38c87@news.optusnet.com.au...

"mrocus" <silent@example.com

Many years now, been a software engineer for over 20 years.



** That explains a lot.




......... Phil

 

[someone]

"mrocus" <silent@example.com> wrote in message
news:40278b52@news.comindico.com.au...

Now Phil,

I heard that you turned out to be a fine technician

They obviously lied!

 

[Bob M]

Hi there,

My Yamaha B2 amp has a relay that disconnects the speakers from the
amp until the power up or power down sequence is complete. You might
check for something similar.

Cheers from Canada

Bob Morgoch

mvandere@iprimus.com.au (Mark van der Eynden) wrote in message news:<48ed3358.0402091921.654e9a10@posting.google.com>...

"mrocus" <silent@example.com> wrote in message news:<40277dd7$1@news.comindico.com.au>...
If I had the amp in front of me, I would do the normal checks ; voltages;
hairline cracks in the pcb, transistors gone into high gain, noisy resistors
and caps, blah blah.

'transistors gone into high gain'? My my, we have been out of the game
for a few years.

And I'm not to sure what most likely is a dead cap across the mains
switch has to do with any of the other checks either.

 

[Wayne Reid]

"mrocus" <silent@example.com> wrote in message
news:40277dd7$1@news.comindico.com.au...

Had a call from a friend in QLD, one of the amps in his studio setup makes
a
popping sound when it is turned off.
He has 5 amplifiers same manufacturer, 4 are okay.

I have been out the repair business for a number of years, so I am abit
rusty these days. The grey hair and the grey matter don't help - G!

Any suggestions on a fix. or where to look

He has just sent me a circ diag, blimey these amps are old, they are in
an
electronic organ installation.

Unlike the other posters, I thought Phil's original comment was reasonable.
But, I'll presume that the fault is not that the amp makes a popping sound
while it is powered off (as described) but rather, a pop or thump is heard
from the speaker at the time the power switch is turned off or shortly
afterwards.

Believe it or not, an ambiguous fault description is likely to generate a
lot of faulty diagnosis from an NG like this one.

Also, your own description of the diagnostics that you would have performed
are a bit sus. When you ask people for help, don't make like you actually
know the answer or at least you could find it if only...

Take a look at http://www.diyaudio.com/forums/showthread/t-5678.html where
there is a reasonable description of two possible faults that could cause
the symptom you described. There is a description of one possible fix - if
the pop is the type of crackle caused by arcing within the mains switch.

If there is a short delay then a thump then you'll need to advise your
friend to either look in JAYCAR / DSE etc. for a speaker protector /
de-thump kit, or he'll need to get a tech to fix the actual fault -
presuming that the amp has not always made a thump (which could be a design
flaw).

Isn't Usenet wonderful - WR

 

[Phil Allison]

"Wayne Reid" <REMOVEgokangas@hotmail.com>

Unlike the other posters, I thought Phil's original comment was
reasonable.

** Humourous too.

But, I'll presume that the fault is not that the amp makes a popping sound
while it is powered off (as described) .....

** But that ** is exactly ** what the OP is asking about.



.......... Phil

 

[Wayne Reid]

"Phil Allison" <philallison@optusnet.com.au> wrote in message
news:403033f4$0$18303$afc38c87@news.optusnet.com.au...

"Wayne Reid" <REMOVEgokangas@hotmail.com

Unlike the other posters, I thought Phil's original comment was
reasonable.


** Humourous too.

I thought it was.

But, I'll presume that the fault is not that the amp makes a popping
sound
while it is powered off (as described) .....


** But that ** is exactly ** what the OP is asking about.

I agree. For a few seconds I thought this could be a kind of perpetual
energy machine.

It would be nice if even 10% of the questions posted to this NG were phrased
in such a way that the reader does not need to second guess what the OP
really means.

I usually cringe to myself as I read the questions. Why don't people ask the
question that they are seeking an answer to?

WR

 

[Phil Allison]

"Wayne Reid" <REMOVEgokangas@hotmail.

"Phil Allison" <philallison@optusnet.com.au> ...

Unlike the other posters, I thought Phil's original comment was
reasonable.

** Humourous too.

I thought it was.

**

But, I'll presume that the fault is not that the amp makes a popping
sound> while it is powered off (as described) .....


** But that ** is exactly ** what the OP is asking about.

I agree. For a few seconds I thought this could be a kind of perpetual
energy machine.

It would be nice if even 10% of the questions posted to this NG were
phrased
in such a way that the reader does not need to second guess what the OP
really means.

** Most of the questions on this NG involve folk doing things that are
either crazy, dangerous or illegal.

Sometimes all three at once.

I usually cringe to myself as I read the questions. Why don't people ask
the
question that they are seeking an answer to?

** That question has many answers - folk with crazy, dangerous and
illegal actions in mind are likely to be cagey about them.

Others think they already know the answer and just want confirmation from
an outsider - mostly they are miles off the right answer.

Many just do not realise how complicated their matter is and post a
simplistic question expecting a simplistic answer - they often get all
snaky when the wanted, magic answer is not posted.

The OP here fits into a few of the above genres.



......... regards, Phil