P
Phil Allison
Guest
"Gareth Magennis"
** IS THE *SOURCE* ON THE FUCKING CASE OR NOT !!!
You FUCKING MORON !!
......Phil
** IS THE *SOURCE* ON THE FUCKING CASE OR NOT !!!
You FUCKING MORON !!
......Phil
G
Gareth Magennis
Guest
"Phil Allison" <phil_a@tpg.com.au> wrote in message
news:905dp7F62vU1@mid.individual.net...
news:905dp7F62vU1@mid.individual.net...
Bye bye.
G
Gareth Magennis
Guest
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:injqf8$vi8$1@dont-email.me...
It does claim to measure hfe, but again I don't know with which parameters.
I don't think its meant to be a precision instrument but I find it very
useful, mostly for finding dead mosfets and possible good ones, and
identifying pinouts of bipolars.
I once had terrible problems with a C-audio amp that I just couldn't get
working. They had loads of BC184 (I think) doing the bias and stuff. I
replaced the lot with BC184L, not realising that the "L" meant the pinout
was different. Took me a looong time to suss that one out.
Now I always double check with the Peak when replacing any signal
transistor, just in case.
Likewise Farnell once sold me some resistors that were a decade lower than
marked on the packaging. Again took me a while to suss out the problem, and
I now always meter EVERY resistor before soldering it in.
Cheers,
Gareth.
news:injqf8$vi8$1@dont-email.me...
Don't have a clue. It runs on a 9v battery.Gareth Magennis <sound.service@btconnect.com> wrote in message
news-SdnRAdzr627QHQnZ2dnUVZ8oydnZ2d@bt.com...
Hi,
I have a Trace Elliot 300W bass amp here that uses 2 pairs of BUZ901/906
mosfets. All output devices have been resoldered or replaced at some
point,
and the amp now contains 2 x BUZ901 (SML) and 2 marked STUD1P.
I've repaired a few of these in my time but never come across this
marking.
Is it a Trace internal number, or have these been substituted in from
elsewhere? Are they actually BUZ906?
(One BUZ901 is blown, the other 3 check out OK on a PEAK component
tester).
Cheers,
Gareth.
perhaps obtained from these people
http://www.autogarduk.com/stock%20list%2027.htm
41 P and 274 N
What are the test parameters of a Peak?
It does claim to measure hfe, but again I don't know with which parameters.
I don't think its meant to be a precision instrument but I find it very
useful, mostly for finding dead mosfets and possible good ones, and
identifying pinouts of bipolars.
I once had terrible problems with a C-audio amp that I just couldn't get
working. They had loads of BC184 (I think) doing the bias and stuff. I
replaced the lot with BC184L, not realising that the "L" meant the pinout
was different. Took me a looong time to suss that one out.
Now I always double check with the Peak when replacing any signal
transistor, just in case.
Likewise Farnell once sold me some resistors that were a decade lower than
marked on the packaging. Again took me a while to suss out the problem, and
I now always meter EVERY resistor before soldering it in.
Cheers,
Gareth.
N
N_Cook
Guest
Gareth Magennis <sound.service@btconnect.com> wrote in message
news:ANidnUiZgbJ9GADQnZ2dnUVZ8mCdnZ2d@bt.com...
fitting sometime in the near future , see thread here last week T-E GP12 SMX
and Studiomaster comparison
Dealt with a heap of C-audio Pulse 2 1100 last year. Stored outdoors (open
sided barn) with the thinking that plastic tarpaulin over the rack with a
pack of silica gel (as found, not activated) inside it in the autumn would
keep them ok over a GB winter.
Except for a few colateral damage burnt out 1/3W R , all the problems were
those TO92 , gone slightly ohmic presumably from damp ingress. Throws out
the bias and then amp always goes into protect.
news:ANidnUiZgbJ9GADQnZ2dnUVZ8mCdnZ2d@bt.com...
If mains fuse is designated T3.15 amp, it wil probably need an inrush"N_Cook" <diverse@tcp.co.uk> wrote in message
news:injqf8$vi8$1@dont-email.me...
Gareth Magennis <sound.service@btconnect.com> wrote in message
news
Hi,
I have a Trace Elliot 300W bass amp here that uses 2 pairs of
BUZ901/906
mosfets. All output devices have been resoldered or replaced at some
point,
and the amp now contains 2 x BUZ901 (SML) and 2 marked STUD1P.
I've repaired a few of these in my time but never come across this
marking.
Is it a Trace internal number, or have these been substituted in from
elsewhere? Are they actually BUZ906?
(One BUZ901 is blown, the other 3 check out OK on a PEAK component
tester).
Cheers,
Gareth.
perhaps obtained from these people
http://www.autogarduk.com/stock%20list%2027.htm
41 P and 274 N
What are the test parameters of a Peak?
Don't have a clue. It runs on a 9v battery.
It does claim to measure hfe, but again I don't know with which
parameters.
I don't think its meant to be a precision instrument but I find it very
useful, mostly for finding dead mosfets and possible good ones, and
identifying pinouts of bipolars.
I once had terrible problems with a C-audio amp that I just couldn't get
working. They had loads of BC184 (I think) doing the bias and stuff. I
replaced the lot with BC184L, not realising that the "L" meant the pinout
was different. Took me a looong time to suss that one out.
Now I always double check with the Peak when replacing any signal
transistor, just in case.
Likewise Farnell once sold me some resistors that were a decade lower than
marked on the packaging. Again took me a while to suss out the problem,
and
I now always meter EVERY resistor before soldering it in.
Cheers,
Gareth.
fitting sometime in the near future , see thread here last week T-E GP12 SMX
and Studiomaster comparison
Dealt with a heap of C-audio Pulse 2 1100 last year. Stored outdoors (open
sided barn) with the thinking that plastic tarpaulin over the rack with a
pack of silica gel (as found, not activated) inside it in the autumn would
keep them ok over a GB winter.
Except for a few colateral damage burnt out 1/3W R , all the problems were
those TO92 , gone slightly ohmic presumably from damp ingress. Throws out
the bias and then amp always goes into protect.
P
Phil Allison
Guest
"Gareth Magennis"
** FFS - asshole !!
What the FUCKING HELL is wrong with you ????
Is it gonna KILL YOU to post a simple, factual reply ???
The ANSWER to MY question is the ANSWER to YOUR question !!
Did your mom refuse to breast feed you ? ?
Did your dad fuck you up the arse when you were two?? ??
JESUS FUCKING CHRIST alive ...............
You gotta be the most RETARDED autistic pommy cunt ALIVE !!
...... Phil
** FFS - asshole !!
What the FUCKING HELL is wrong with you ????
Is it gonna KILL YOU to post a simple, factual reply ???
The ANSWER to MY question is the ANSWER to YOUR question !!
Did your mom refuse to breast feed you ? ?
Did your dad fuck you up the arse when you were two?? ??
JESUS FUCKING CHRIST alive ...............
You gotta be the most RETARDED autistic pommy cunt ALIVE !!
...... Phil
G
Gareth Magennis
Guest
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:injqf8$vi8$1@dont-email.me...
things than mine, like gate threshold voltage.
http://www.rapidonline.com/Tools-Fasteners-Production-Equipment/Test-Equipment/Analysers-Testers-Counter/Atlas-DCA-Semiconductor-component-analyser/36637/kw/85-2514?source=googleps&utm_source=googleps
Gareth.
news:injqf8$vi8$1@dont-email.me...
Just realised I've got the old version of the Peak. The new one does moreGareth Magennis <sound.service@btconnect.com> wrote in message
news
Hi,
I have a Trace Elliot 300W bass amp here that uses 2 pairs of BUZ901/906
mosfets. All output devices have been resoldered or replaced at some
point,
and the amp now contains 2 x BUZ901 (SML) and 2 marked STUD1P.
I've repaired a few of these in my time but never come across this
marking.
Is it a Trace internal number, or have these been substituted in from
elsewhere? Are they actually BUZ906?
(One BUZ901 is blown, the other 3 check out OK on a PEAK component
tester).
Cheers,
Gareth.
perhaps obtained from these people
http://www.autogarduk.com/stock%20list%2027.htm
41 P and 274 N
What are the test parameters of a Peak?
things than mine, like gate threshold voltage.
http://www.rapidonline.com/Tools-Fasteners-Production-Equipment/Test-Equipment/Analysers-Testers-Counter/Atlas-DCA-Semiconductor-component-analyser/36637/kw/85-2514?source=googleps&utm_source=googleps
Gareth.
G
Gareth Magennis
Guest
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:inkci4$p1i$1@dont-email.me...
I contributed to that thread. I'll be sticking a T4 in it instead. ;-)
4 new Mosfets and labour is almost an uneconomical repair as it is.
I looked inside 2 of these C audio pulse (nothing to do with C audio really)
and quickly put them back together again and gave them straight back. Fist
time I'd ever done anything like that.
Gareth.
news:inkci4$p1i$1@dont-email.me...
Gareth Magennis <sound.service@btconnect.com> wrote in message
news:ANidnUiZgbJ9GADQnZ2dnUVZ8mCdnZ2d@bt.com...
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:injqf8$vi8$1@dont-email.me...
Gareth Magennis <sound.service@btconnect.com> wrote in message
news
Hi,
I have a Trace Elliot 300W bass amp here that uses 2 pairs of
BUZ901/906
mosfets. All output devices have been resoldered or replaced at some
point,
and the amp now contains 2 x BUZ901 (SML) and 2 marked STUD1P.
I've repaired a few of these in my time but never come across this
marking.
Is it a Trace internal number, or have these been substituted in from
elsewhere? Are they actually BUZ906?
(One BUZ901 is blown, the other 3 check out OK on a PEAK component
tester).
Cheers,
Gareth.
perhaps obtained from these people
http://www.autogarduk.com/stock%20list%2027.htm
41 P and 274 N
What are the test parameters of a Peak?
Don't have a clue. It runs on a 9v battery.
It does claim to measure hfe, but again I don't know with which
parameters.
I don't think its meant to be a precision instrument but I find it very
useful, mostly for finding dead mosfets and possible good ones, and
identifying pinouts of bipolars.
I once had terrible problems with a C-audio amp that I just couldn't get
working. They had loads of BC184 (I think) doing the bias and stuff. I
replaced the lot with BC184L, not realising that the "L" meant the pinout
was different. Took me a looong time to suss that one out.
Now I always double check with the Peak when replacing any signal
transistor, just in case.
Likewise Farnell once sold me some resistors that were a decade lower
than
marked on the packaging. Again took me a while to suss out the problem,
and
I now always meter EVERY resistor before soldering it in.
Cheers,
Gareth.
If mains fuse is designated T3.15 amp, it wil probably need an inrush
fitting sometime in the near future , see thread here last week T-E GP12
SMX
and Studiomaster comparison
I contributed to that thread. I'll be sticking a T4 in it instead. ;-)
4 new Mosfets and labour is almost an uneconomical repair as it is.
I looked inside 2 of these C audio pulse (nothing to do with C audio really)
and quickly put them back together again and gave them straight back. Fist
time I'd ever done anything like that.
Gareth.
A
Arfa Daily
Guest
"Phil Allison" <phil_a@tpg.com.au> wrote in message
news:905njjFg5aU1@mid.individual.net...
Arfa
news:905njjFg5aU1@mid.individual.net...
I thought you told me a couple of weeks ago, that that was me Philip ...
Arfa
I
Ian Field
Guest
"Arfa Daily" <arfa.daily@ntlworld.com> wrote in message
news:WIknp.6238$2o1.4811@newsfe18.ams2...
There's one for every one of his split personalities.
news:WIknp.6238$2o1.4811@newsfe18.ams2...
There's one for every one of his split personalities.
G
Gareth Magennis
Guest
"Phil Allison" <phil_a@tpg.com.au> wrote in message
news:905njjFg5aU1@mid.individual.net...
Phil, if you want to tell us about Mosfet dv/dt failure or something, just
come straight out with it.
I don't know why you feel the need to set these traps.
But thanks for the heads up anyway.
Gareth.
news:905njjFg5aU1@mid.individual.net...
Phil, if you want to tell us about Mosfet dv/dt failure or something, just
come straight out with it.
I don't know why you feel the need to set these traps.
But thanks for the heads up anyway.
Gareth.
M
Meat Plow
Guest
On Thu, 07 Apr 2011 16:26:44 +0100, Arfa Daily wrote:
--
Live Fast Die Young, Leave A Pretty Corpse
It's everyone who isn't Phil "fucking insane" Allison."Phil Allison" <phil_a@tpg.com.au> wrote in message
news:905njjFg5aU1@mid.individual.net...
"Gareth Magennis"
Doesn't display voltage information, it either says its a "* channel
mosfet" and identifies the pins,
** IS THE *SOURCE* ON THE FUCKING CASE OR NOT !!!
You FUCKING MORON !!
Bye bye.
** FFS - asshole !!
What the FUCKING HELL is wrong with you ????
Is it gonna KILL YOU to post a simple, factual reply ???
The ANSWER to MY question is the ANSWER to YOUR question !!
Did your mom refuse to breast feed you ? ?
Did your dad fuck you up the arse when you were two?? ??
JESUS FUCKING CHRIST alive ...............
You gotta be the most RETARDED autistic pommy cunt ALIVE !!
..... Phil
I thought you told me a couple of weeks ago, that that was me Philip ...
Arfa
--
Live Fast Die Young, Leave A Pretty Corpse
M
Meat Plow
Guest
On Thu, 07 Apr 2011 14:03:34 +0100, Gareth Magennis wrote:
to identify BCE correctly because it has 6 pushbuttons on it. It's still
a useful tool to check leakage and gain.
--
Live Fast Die Young, Leave A Pretty Corpse
analyser/36637/kw/85-2514?source=googleps&utm_source=googleps"N_Cook" <diverse@tcp.co.uk> wrote in message
news:injqf8$vi8$1@dont-email.me...
Gareth Magennis <sound.service@btconnect.com> wrote in message
news
Hi,
I have a Trace Elliot 300W bass amp here that uses 2 pairs of
BUZ901/906 mosfets. All output devices have been resoldered or
replaced at some
point,
and the amp now contains 2 x BUZ901 (SML) and 2 marked STUD1P.
I've repaired a few of these in my time but never come across this
marking.
Is it a Trace internal number, or have these been substituted in from
elsewhere? Are they actually BUZ906?
(One BUZ901 is blown, the other 3 check out OK on a PEAK component
tester).
Cheers,
Gareth.
perhaps obtained from these people
http://www.autogarduk.com/stock%20list%2027.htm 41 P and 274 N
What are the test parameters of a Peak?
Just realised I've got the old version of the Peak. The new one does
more things than mine, like gate threshold voltage.
http://www.rapidonline.com/Tools-Fasteners-Production-Equipment/Test-
Equipment/Analysers-Testers-Counter/Atlas-DCA-Semiconductor-component-
I own a really old Sencore Cricket transitor/fet checker. You don't have
to identify BCE correctly because it has 6 pushbuttons on it. It's still
a useful tool to check leakage and gain.
--
Live Fast Die Young, Leave A Pretty Corpse
P
Phil Allison
Guest
"Gareth Magennis"
** There is NO TRAP - you dopey wanker.
You want to know if that STUP1D device is a lateral mosfet like the BUZ906 -
right?
If it is, it will have the SOURCE connected to the case.
But if as is likely it is NOT like the BUZ906, the SOURCE will be on the
same pin that is the emitter of a TO3 transistor.
FACT:
All power mosfets have an internal DIODE between the Source and Drain
terminals that is reverse biased in operation.
So, you just need a multimeter to say which way the device in question is
connected internally.
..... Phil
** There is NO TRAP - you dopey wanker.
You want to know if that STUP1D device is a lateral mosfet like the BUZ906 -
right?
If it is, it will have the SOURCE connected to the case.
But if as is likely it is NOT like the BUZ906, the SOURCE will be on the
same pin that is the emitter of a TO3 transistor.
FACT:
All power mosfets have an internal DIODE between the Source and Drain
terminals that is reverse biased in operation.
So, you just need a multimeter to say which way the device in question is
connected internally.
..... Phil
G
Gareth Magennis
Guest
"Phil Allison" <phil_a@tpg.com.au> wrote in message
news:9076fnFbjbU1@mid.individual.net...
as these are TO247 versions, not TO3).
But in trying to decipher what I thought you were getting at, I investigated
the dv/dt failure mode which I think the "blown" mosfet may have, as there
is around 165ohms between gate and source and/or drain. (I can't stop the
SD from looking like a short circuit).
Interestingly the customer said that the amp went DC and fried his speaker -
the amp has no relay or DC protection. My little bit or research so far
indicates that dv/dt failure in industrial motor applications can be down to
pulling the power cable off a stalled motor, zapping the gate/substrate
connection in a nanosecond. Might this also apply to a faulty speaker in
this kind of audio amp which burns short then eventually self disconnects?
I also understand extremely electrically noisy environments can also induce
this failure mode. The customer is daisy chaining this amp with another one
via the FX send, I'm wondering if this has any chance of being the cause of
the failure.
Cheers,
Gareth.
news:9076fnFbjbU1@mid.individual.net...
OK, thanks. This does have the Source connected to case (actually the tab
as these are TO247 versions, not TO3).
But in trying to decipher what I thought you were getting at, I investigated
the dv/dt failure mode which I think the "blown" mosfet may have, as there
is around 165ohms between gate and source and/or drain. (I can't stop the
SD from looking like a short circuit).
Interestingly the customer said that the amp went DC and fried his speaker -
the amp has no relay or DC protection. My little bit or research so far
indicates that dv/dt failure in industrial motor applications can be down to
pulling the power cable off a stalled motor, zapping the gate/substrate
connection in a nanosecond. Might this also apply to a faulty speaker in
this kind of audio amp which burns short then eventually self disconnects?
I also understand extremely electrically noisy environments can also induce
this failure mode. The customer is daisy chaining this amp with another one
via the FX send, I'm wondering if this has any chance of being the cause of
the failure.
Cheers,
Gareth.
P
Phil Allison
Guest
"Gareth Magennis"
** The ONLY maker in the world of lateral mosfets in TO3 or TO247 is
Semelab.
Their BUZ905P and BUZ906P types are available in TO247 packs.
But I very much doubt your " STUP1D " is one of them.
TO3 versions of *lateral* types often go open on the drain pin when the
internal bonding wire fails after the chip has melted and shorted.
** Blowing MOSFETS in that amp means the owner is abusing it - likely by
using an extension speaker cab with a dodgy or shorted jack lead.
Your wacky theories on the failures are just as off the planet as everything
else you post.
.... Phil
** The ONLY maker in the world of lateral mosfets in TO3 or TO247 is
Semelab.
Their BUZ905P and BUZ906P types are available in TO247 packs.
But I very much doubt your " STUP1D " is one of them.
** Melted mosfet chips always go low resistance Gate to Source.
TO3 versions of *lateral* types often go open on the drain pin when the
internal bonding wire fails after the chip has melted and shorted.
** Blowing MOSFETS in that amp means the owner is abusing it - likely by
using an extension speaker cab with a dodgy or shorted jack lead.
Your wacky theories on the failures are just as off the planet as everything
else you post.
.... Phil
G
Gareth Magennis
Guest
"Phil Allison" <phil_a@tpg.com.au> wrote in message
news:9083ruFfhjU1@mid.individual.net...
than just the symptoms. I don't want this to come back again needing more
very expensive Mosfets.
In fact I'm thinking of not doing it at all now.
Cheers,
Gareth.
news:9083ruFfhjU1@mid.individual.net...
Yeah, well, I'm just trying to ensure I end up treating the cause rather
than just the symptoms. I don't want this to come back again needing more
very expensive Mosfets.
In fact I'm thinking of not doing it at all now.
Cheers,
Gareth.
P
Phil Allison
Guest
"Gareth Magennis"
** Repairers are not in a position to do investigations into mysteries -
like Sherlock Holmes - so can only make guesses at what really happened to
cause a given failure, at best.
Some owners repeatedly damage their own amplifiers by the grossest of
stupidity - and then lie about it.
Egs:
1. Plugging two amps into the same speaker cab.
2. Running a jack lead from one amp's output to another amp's output.
3. Using broken, home made and plain faulty jack leads with speaker cabs.
4. Loaning their amp to a mate or other person who is an idiot.
5. Letting fuckwit roadies muck about with and set up their amps when they
are absent.
6. Hiring their amps out for profit and never telling the repair tech about
that.
In all the above cases, serious amp damage is a near certainty and most
owners will never admit to doing it.
** With the history being as you described - that may well be the best
move.
I have a particular aversion to dealing with DJs under any circumstances.
.... Phil
** Repairers are not in a position to do investigations into mysteries -
like Sherlock Holmes - so can only make guesses at what really happened to
cause a given failure, at best.
Some owners repeatedly damage their own amplifiers by the grossest of
stupidity - and then lie about it.
Egs:
1. Plugging two amps into the same speaker cab.
2. Running a jack lead from one amp's output to another amp's output.
3. Using broken, home made and plain faulty jack leads with speaker cabs.
4. Loaning their amp to a mate or other person who is an idiot.
5. Letting fuckwit roadies muck about with and set up their amps when they
are absent.
6. Hiring their amps out for profit and never telling the repair tech about
that.
In all the above cases, serious amp damage is a near certainty and most
owners will never admit to doing it.
** With the history being as you described - that may well be the best
move.
I have a particular aversion to dealing with DJs under any circumstances.
.... Phil
G
Gareth Magennis
Guest
Decision is made, I'm not touching this.
I know its going to go badly wrong - Wooooo, I see, I see, um, blown
Mosfets and another melted speaker.
Gareth.
I know its going to go badly wrong - Wooooo, I see, I see, um, blown
Mosfets and another melted speaker.
Gareth.
M
Meat Plow
Guest
On Fri, 08 Apr 2011 10:17:06 +0100, Gareth Magennis wrote:
poorly wired/connected load might be the reason.
--
Live Fast Die Young, Leave A Pretty Corpse
Slaving another amp via the send isn't likely but a failing speaker or
poorly wired/connected load might be the reason.
--
Live Fast Die Young, Leave A Pretty Corpse
G
Gareth Magennis
Guest
"Meat Plow" <mhywattt@yahoo.com> wrote in message
newsan.2011.04.08.17.26.17@lmao.lol.lol...
Check this out, if just for educational purposes. Quite interesting.
http://www.4qd.co.uk/serv/MOSFETfail.html
Gareth.
news
an.2011.04.08.17.26.17@lmao.lol.lol...Check this out, if just for educational purposes. Quite interesting.
http://www.4qd.co.uk/serv/MOSFETfail.html
Gareth.