Strangely marked BUZ Mosfet

  • Thread starter Gareth Magennis
  • Start date
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Gareth Magennis

Guest
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.
 
"Gareth Magennis is a FUCKING MORON "
I have a Trace Elliot 300W bass amp here
Click to expand...

** I suppose you whole life is over if you tell us the fucking model number
?


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.
Click to expand...

** The device is labelled " STUPID " ???

April 1st has gone you know.


One BUZ901 is blown,
Click to expand...

** I suppose your whole life depends of not telling us what YOU mean by the
word "blown" ??

Lateral MOSFETS fail ( if they fail) in a unique way - not like any
other power devices.

WHAT IS IT ???




..... Phil
 
Gareth Magennis <sound.service@btconnect.com> wrote in message
news:p-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.
Click to expand...

While at it toroidal mains Tx ? any inrush limitation ? no ken those
markings.
Trace Elliot GP12 SMX, 1998 300W bass amp last week PA was marked "Bipolar
Bear" on overlay and devices under spring clips, not seen , but checked out
as BCE npn & pnp devices
 
"Phil Allison" <phil_a@tpg.com.au> wrote in message
news:903a2uFae1U1@mid.individual.net...
"Gareth Magennis is a FUCKING MORON "


I have a Trace Elliot 300W bass amp here


** I suppose you whole life is over if you tell us the fucking model
number ?


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.


** The device is labelled " STUPID " ???

April 1st has gone you know.


One BUZ901 is blown,


** I suppose your whole life depends of not telling us what YOU mean by
the word "blown" ??

Lateral MOSFETS fail ( if they fail) in a unique way - not like any
other power devices.

WHAT IS IT ???




.... Phil
Click to expand...

You do make me laugh, Phil.


If it matters, it is a 7215 combo, i.e. a GP7 300 Watt SM series, but I
believe all Trace Amps share the same 2 amplifier modules.
There's a Bi-polar Bear which is Bi-polar (you might like that one), or the
150/300W Mosfet board which is Mosfet. I guess the 150W one uses just 2
Mosfets and smaller PSU caps.


But the question is only about the markings on the output devices, and
whether this STUD1P device is the original Trace part or some numpty
repairman has retrofitted a dodgy part he manufactured himself in his
kitchen of took it out of a Studiomaster or summat.



Sigh.
 
p.s. it has been repaired at a place I know about that is well known for
dodgy repairs, and the soldering is absolutely shocking.
 
"Gareth Magennis is a FUCKING MORON "
I have a Trace Elliot 300W bass amp here


** I suppose you whole life is over if you tell us the fucking model
number ?


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.


** The device is labelled " STUPID " ???

April 1st has gone you know.


One BUZ901 is blown,


** I suppose your whole life depends of not telling us what YOU mean by
the word "blown" ??

Lateral MOSFETS fail ( if they fail) in a unique way - not like any
other power devices.

WHAT IS IT ???


You do make me laugh, Phil.
Click to expand...

** You make everybody puke.

You colossal TURD !!


If it matters,
Click to expand...
** Of COURSE it fucking matters !!!!!!!!!!

it is a 7215 combo, i.e. a GP7 300 Watt SM series,
Click to expand...

** So now folk can look up the thing in their files -

YOU FUCKING TENTH WIT !!!!!!!!!!!


But the question is only about the markings on the output devices, and
whether this STUD1P device is the original Trace part or some numpty
repairman has retrofitted a dodgy part he manufactured himself in his
kitchen of took it out of a Studiomaster or summat.
Click to expand...

** Who fucking cares ?

If you do not know how to test it - you are an absolute ASS.

Now - answer my fucking QUESTION !!

Go back - read my posts ten times AND you just might see there IS one.

You steaming great pommy FUCKWIT !!



..... Phil
 
"Phil Allison" <phil_a@tpg.com.au> wrote in message
news:903clgFtn9U1@mid.individual.net...
"Gareth Magennis is a FUCKING MORON "

I have a Trace Elliot 300W bass amp here


** I suppose you whole life is over if you tell us the fucking model
number ?


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.


** The device is labelled " STUPID " ???

April 1st has gone you know.


One BUZ901 is blown,


** I suppose your whole life depends of not telling us what YOU mean by
the word "blown" ??

Lateral MOSFETS fail ( if they fail) in a unique way - not like any
other power devices.

WHAT IS IT ???


You do make me laugh, Phil.


** You make everybody puke.

You colossal TURD !!


If it matters,

** Of COURSE it fucking matters !!!!!!!!!!

it is a 7215 combo, i.e. a GP7 300 Watt SM series,


** So now folk can look up the thing in their files -

YOU FUCKING TENTH WIT !!!!!!!!!!!


But the question is only about the markings on the output devices, and
whether this STUD1P device is the original Trace part or some numpty
repairman has retrofitted a dodgy part he manufactured himself in his
kitchen of took it out of a Studiomaster or summat.


** Who fucking cares ?

If you do not know how to test it - you are an absolute ASS.

Now - answer my fucking QUESTION !!

Go back - read my posts ten times AND you just might see there IS
one.

You steaming great pommy FUCKWIT !!



.... Phil
Click to expand...


I've already told you I tested the MOSFETS with a PEAK component analyser.

There, I've done it again, it says "P-channel MOSFET". The blown one says
"NO VALID PART FOUND".


You don't happen to know if this STUP1D Mosfet is a BUZ906 by any chance?
 
"Gareth Magennis is a FUCKING MORON "
** Who fucking cares ?

If you do not know how to test it - you are an absolute ASS.

Now - answer my fucking QUESTION !!

Go back - read my posts ten times AND you just might see there IS
one.

You steaming great pommy FUCKWIT !!


I've already told you I tested the MOSFETS with a PEAK component analyser.
Click to expand...

** You are one LYING POMMY CUNT !

QUOTE:

"One BUZ901 is blown, the other 3 check out OK on a PEAK component tester ".

So - SOMEHOW you think the BUZ901 is 'blown".

But you do not say WHY or how you know !!!!!!!!!

Do you own a fucking multimeter ?

Got the slightest fucking idea how to use it??

Obviously NOT.



..... Phil
 
"Gareth Magennis is a Steaming Great TURD "

You don't happen to know if this STUP1D Mosfet is a BUZ906 by any chance?
Click to expand...
** You just changed the part number.

Stupid.


..... Phil
 
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:ini43d$nfo$1@dont-email.me...
Gareth Magennis <sound.service@btconnect.com> wrote in message
news:p-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.




While at it toroidal mains Tx ? any inrush limitation ? no ken those
markings.
Trace Elliot GP12 SMX, 1998 300W bass amp last week PA was marked "Bipolar
Bear" on overlay and devices under spring clips, not seen , but checked
out
as BCE npn & pnp devices
Click to expand...

Toroid, will get back to you tomorrow with the rest.



Gareth.
 
"Meat Plow" <mhywattt@yahoo.com> wrote in message
news:pan.2011.04.06.17.34.52@lmao.lol.lol...
On Wed, 06 Apr 2011 15:45:02 +0100, Gareth Magennis wrote:

p.s. it has been repaired at a place I know about that is well known for
dodgy repairs, and the soldering is absolutely shocking.

Why not just replace all 4 with known pairs? TT manufactures
a bunch of different audio mosfet devices
http://www.semelab.com/magnatec/alfet.shtml



--
Live Fast Die Young, Leave A Pretty Corpse
Click to expand...



Yes, that is my preferred option, and I could get them from Farnell
tomorrow.
However, that would cost me about ÂŁ50 for the four, so perhaps ÂŁ60 to the
customer, which is getting on for $100.


If there is any doubt what these oddly marked devices actually are I will do
just that.



Cheers,


Gareth.
 
On Wed, 06 Apr 2011 15:45:02 +0100, Gareth Magennis wrote:

p.s. it has been repaired at a place I know about that is well known for
dodgy repairs, and the soldering is absolutely shocking.
Click to expand...
Why not just replace all 4 with known pairs? TT manufactures
a bunch of different audio mosfet devices
http://www.semelab.com/magnatec/alfet.shtml



--
Live Fast Die Young, Leave A Pretty Corpse
 
Ah, I see now you meant alternatives.

Not really my policy I'm afraid. If it blew up again I wouldn't have a leg
to stand on.


Cheers,


Gareth.
 
"Gareth Magennis" <sound.service@btconnect.com> wrote in message
news:5LmdnZnaf6KG4gHQnZ2dnUVZ8kmdnZ2d@bt.com...
"Phil Allison" <phil_a@tpg.com.au> wrote in message
news:903clgFtn9U1@mid.individual.net...
"Gareth Magennis is a FUCKING MORON "

I have a Trace Elliot 300W bass amp here


** I suppose you whole life is over if you tell us the fucking model
number ?


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.


** The device is labelled " STUPID " ???

April 1st has gone you know.


One BUZ901 is blown,


** I suppose your whole life depends of not telling us what YOU mean
by the word "blown" ??

Lateral MOSFETS fail ( if they fail) in a unique way - not like any
other power devices.

WHAT IS IT ???


You do make me laugh, Phil.


** You make everybody puke.

You colossal TURD !!


If it matters,

** Of COURSE it fucking matters !!!!!!!!!!

it is a 7215 combo, i.e. a GP7 300 Watt SM series,


** So now folk can look up the thing in their files -

YOU FUCKING TENTH WIT !!!!!!!!!!!


But the question is only about the markings on the output devices, and
whether this STUD1P device is the original Trace part or some numpty
repairman has retrofitted a dodgy part he manufactured himself in his
kitchen of took it out of a Studiomaster or summat.


** Who fucking cares ?

If you do not know how to test it - you are an absolute ASS.

Now - answer my fucking QUESTION !!

Go back - read my posts ten times AND you just might see there IS
one.

You steaming great pommy FUCKWIT !!



.... Phil





I've already told you I tested the MOSFETS with a PEAK component analyser.
Click to expand...

Philthy was raised by dingoes.
 
Ian Field wrote:
"Gareth Magennis" <sound.service@btconnect.com> wrote in message
news:5LmdnZnaf6KG4gHQnZ2dnUVZ8kmdnZ2d@bt.com...

"Phil Allison" <phil_a@tpg.com.au> wrote in message
news:903clgFtn9U1@mid.individual.net...
"Gareth Magennis is a FUCKING MORON "

I have a Trace Elliot 300W bass amp here


** I suppose you whole life is over if you tell us the fucking model
number ?


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.


** The device is labelled " STUPID " ???

April 1st has gone you know.


One BUZ901 is blown,


** I suppose your whole life depends of not telling us what YOU mean
by the word "blown" ??

Lateral MOSFETS fail ( if they fail) in a unique way - not like any
other power devices.

WHAT IS IT ???


You do make me laugh, Phil.


** You make everybody puke.

You colossal TURD !!


If it matters,

** Of COURSE it fucking matters !!!!!!!!!!

it is a 7215 combo, i.e. a GP7 300 Watt SM series,


** So now folk can look up the thing in their files -

YOU FUCKING TENTH WIT !!!!!!!!!!!


But the question is only about the markings on the output devices, and
whether this STUD1P device is the original Trace part or some numpty
repairman has retrofitted a dodgy part he manufactured himself in his
kitchen of took it out of a Studiomaster or summat.


** Who fucking cares ?

If you do not know how to test it - you are an absolute ASS.

Now - answer my fucking QUESTION !!

Go back - read my posts ten times AND you just might see there IS
one.

You steaming great pommy FUCKWIT !!



.... Phil





I've already told you I tested the MOSFETS with a PEAK component analyser.

Philthy was raised by dingoes.
Click to expand...

Gay dingoes.


--
You can't fix stupid. You can't even put a Band-Aid™ on it, because it's
Teflon coated.
 
On Wed, 06 Apr 2011 20:25:57 +0100, Gareth Magennis wrote:

"Meat Plow" <mhywattt@yahoo.com> wrote in message
news:pan.2011.04.06.17.34.52@lmao.lol.lol...
On Wed, 06 Apr 2011 15:45:02 +0100, Gareth Magennis wrote:

p.s. it has been repaired at a place I know about that is well known
for dodgy repairs, and the soldering is absolutely shocking.

Why not just replace all 4 with known pairs? TT manufactures a bunch of
different audio mosfet devices
http://www.semelab.com/magnatec/alfet.shtml



--
Live Fast Die Young, Leave A Pretty Corpse




Yes, that is my preferred option, and I could get them from Farnell
tomorrow.
However, that would cost me about ÂŁ50 for the four, so perhaps ÂŁ60 to
the customer, which is getting on for $100.


If there is any doubt what these oddly marked devices actually are I
will do just that.



Cheers,


Gareth.
Click to expand...


$100 isn't bad for a slayed output stage. Especially on previously bodged
repairs. For that combo and most others including vintage my minimum fee
is $100 before parts. I do more work on vintage than anything. People
drag in these Silvertone, Airline, Ampeg, Gibson etc.. from the late
1950's/60's all the time. If it's a small combo like a GA series
Discovery,Maestro,Explorer etc...I'll slide the $100 minimum fee unless
it needs a restoration. Last Silvertone 50 watt head I restored I charged
$200 labor and the customer never batted an eyelid.

I'd replace all 4 of those devices and take a hard look at the whole thing
probably before I ordered parts.

--
Live Fast Die Young, Leave A Pretty Corpse
 
"Gareth Magennis"

If there is any doubt what these oddly marked devices actually are I will
do just that.
Click to expand...

** What does your PEAK say about the pin out and the Gate threshold
voltage ?

Should be Source on the case and about 0.5 to 1.0 volts.


..... Phil
 
"Phil Allison" <phil_a@tpg.com.au> wrote in message
news:904nfoFg8jU1@mid.individual.net...
"Gareth Magennis"


If there is any doubt what these oddly marked devices actually are I will
do just that.


** What does your PEAK say about the pin out and the Gate threshold
voltage ?

Should be Source on the case and about 0.5 to 1.0 volts.


.... Phil
Click to expand...

Doesn't display voltage information, it either says its a "* channel mosfet"
and identifies the pins, or "no valid part found". Its a PIC based device
I believe.

I bought it purely to check Mosfets go or no go, and it works well.


Gareth.
 
Gareth Magennis <sound.service@btconnect.com> wrote in message
news:p-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.
Click to expand...

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?
 
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:ini43d$nfo$1@dont-email.me...
Gareth Magennis <sound.service@btconnect.com> wrote in message
news:p-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.




While at it toroidal mains Tx ? any inrush limitation ? no ken those
markings.
Trace Elliot GP12 SMX, 1998 300W bass amp last week PA was marked "Bipolar
Bear" on overlay and devices under spring clips, not seen , but checked
out
as BCE npn & pnp devices
Click to expand...

Toroid and no inrush limit device. The Bipolar Bear uses 2SA1695 and
2SC4468 devices.



Gareth.
 
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