Motorola supplementary TO3 stamp codes

N

N_Cook

Guest
I can't say I'd noticed them before today
Is there a cross-reference anwhere ? not necessary this time but if the
printed marking is faded/damaged/burnt/ground off, another time

A batch of 1988 MJ150024 with stamped code D14 around a mounting hole
batch of 1988 MJ15025 stamp code D13
1979 MJ15003 double stamped 924 CD

I don't know if UK amp maker "Exposure" uses rebadged Motorola but marked
EXP8P (pnp) and stamped C5 in similar position
EXP8N (npn) stamped C4 in an Exposure VIII of 1988

If anyone else cares to add here a few more they have lying around it may be
useful sometime

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/
 
N_Cook <diverse@tcp.co.uk> wrote in message
news:hgfpmb$qia$1@news.eternal-september.org...
I can't say I'd noticed them before today
Is there a cross-reference anwhere ? not necessary this time but if the
printed marking is faded/damaged/burnt/ground off, another time

A batch of 1988 MJ150024 with stamped code D14 around a mounting hole
batch of 1988 MJ15025 stamp code D13
1979 MJ15003 double stamped 924 CD

I don't know if UK amp maker "Exposure" uses rebadged Motorola but marked
EXP8P (pnp) and stamped C5 in similar position
EXP8N (npn) stamped C4 in an Exposure VIII of 1988

If anyone else cares to add here a few more they have lying around it may
be
useful sometime

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/
Click to expand...
the 924 one may be a supplemental metalwork datecode without the 7,
preceeding the printed datecode of 7927 nand CD is the typecode for that one
 
On Fri, 18 Dec 2009 11:40:35 -0000, "N_Cook" <diverse@tcp.co.uk>wrote:

I can't say I'd noticed them before today
Is there a cross-reference anwhere ? not necessary this time but if the
printed marking is faded/damaged/burnt/ground off, another time

A batch of 1988 MJ150024 with stamped code D14 around a mounting hole
batch of 1988 MJ15025 stamp code D13
1979 MJ15003 double stamped 924 CD

I don't know if UK amp maker "Exposure" uses rebadged Motorola but marked
EXP8P (pnp) and stamped C5 in similar position
EXP8N (npn) stamped C4 in an Exposure VIII of 1988

If anyone else cares to add here a few more they have lying around it may be
useful sometime
Click to expand...
My 1100 page 1989 Motorola bipolar power transistor data handbook
doesn't cover stamp codes. I used to have a bag of 15023/25 but used
the last pair in a Peavey MX a few months back. Peaver was notorious
for rebadging MOT parts.
 
Meat Plow wrote:
On Fri, 18 Dec 2009 11:40:35 -0000, "N_Cook" <diverse@tcp.co.uk>wrote:

I can't say I'd noticed them before today
Is there a cross-reference anwhere ? not necessary this time but if the
printed marking is faded/damaged/burnt/ground off, another time

A batch of 1988 MJ150024 with stamped code D14 around a mounting hole
batch of 1988 MJ15025 stamp code D13
1979 MJ15003 double stamped 924 CD

I don't know if UK amp maker "Exposure" uses rebadged Motorola but marked
EXP8P (pnp) and stamped C5 in similar position
EXP8N (npn) stamped C4 in an Exposure VIII of 1988

If anyone else cares to add here a few more they have lying around it may be
useful sometime

My 1100 page 1989 Motorola bipolar power transistor data handbook
doesn't cover stamp codes. I used to have a bag of 15023/25 but used
the last pair in a Peavey MX a few months back. Peaver was notorious
for rebadging MOT parts.
Click to expand...

Motorola was always happy to ship parts with a customer's part
number, if you bought enough parts. No need to remark them.

Those numbers he's seeing may indicate the set of tooling used to
seal the TO-3 can for quality control. That way they could track it
back to a particular plant or production line, along with the date
codes.


--
Offworld checks no longer accepted!
 
Michael A. Terrell <mike.terrell@earthlink.net> wrote in message
news:NqWdnS-pmY-9K7bWnZ2dnUVZ_h9i4p2d@earthlink.com...
Meat Plow wrote:

On Fri, 18 Dec 2009 11:40:35 -0000, "N_Cook" <diverse@tcp.co.uk>wrote:

I can't say I'd noticed them before today
Is there a cross-reference anwhere ? not necessary this time but if the
printed marking is faded/damaged/burnt/ground off, another time

A batch of 1988 MJ150024 with stamped code D14 around a mounting hole
batch of 1988 MJ15025 stamp code D13
1979 MJ15003 double stamped 924 CD

I don't know if UK amp maker "Exposure" uses rebadged Motorola but
marked
EXP8P (pnp) and stamped C5 in similar position
EXP8N (npn) stamped C4 in an Exposure VIII of 1988

If anyone else cares to add here a few more they have lying around it
may be
useful sometime

My 1100 page 1989 Motorola bipolar power transistor data handbook
doesn't cover stamp codes. I used to have a bag of 15023/25 but used
the last pair in a Peavey MX a few months back. Peaver was notorious
for rebadging MOT parts.


Motorola was always happy to ship parts with a customer's part
number, if you bought enough parts. No need to remark them.

Those numbers he's seeing may indicate the set of tooling used to
seal the TO-3 can for quality control. That way they could track it
back to a particular plant or production line, along with the date
codes.


--
Offworld checks no longer accepted!
Click to expand...

Would there be a correlation between those stamp codes and the printed type
number and so of some use to repair folk or would there be too much
one-to-many mapping rather than 1 to 1? one stamp code used for dozens of
types so not much use outside Motorola.
 
Michael A. Terrell <mike.terrell@earthlink.net> wrote in message
news:NqWdnS-pmY-9K7bWnZ2dnUVZ_h9i4p2d@earthlink.com...
Meat Plow wrote:

On Fri, 18 Dec 2009 11:40:35 -0000, "N_Cook" <diverse@tcp.co.uk>wrote:

I can't say I'd noticed them before today
Is there a cross-reference anwhere ? not necessary this time but if the
printed marking is faded/damaged/burnt/ground off, another time

A batch of 1988 MJ150024 with stamped code D14 around a mounting hole
batch of 1988 MJ15025 stamp code D13
1979 MJ15003 double stamped 924 CD

I don't know if UK amp maker "Exposure" uses rebadged Motorola but
marked
EXP8P (pnp) and stamped C5 in similar position
EXP8N (npn) stamped C4 in an Exposure VIII of 1988

If anyone else cares to add here a few more they have lying around it
may be
useful sometime

My 1100 page 1989 Motorola bipolar power transistor data handbook
doesn't cover stamp codes. I used to have a bag of 15023/25 but used
the last pair in a Peavey MX a few months back. Peaver was notorious
for rebadging MOT parts.


Motorola was always happy to ship parts with a customer's part
number, if you bought enough parts. No need to remark them.

Those numbers he's seeing may indicate the set of tooling used to
seal the TO-3 can for quality control. That way they could track it
back to a particular plant or production line, along with the date
codes.


--
Offworld checks no longer accepted!
Click to expand...

In the vintage valve/tube world these
http://www.audiotubes.com/mullcode.htm
small etched codes are very useful where the chalky printed type numbers
have diasappeared off the glass envelopes
 
On Fri, 18 Dec 2009 12:04:21 -0500, "Michael A. Terrell"
<mike.terrell@earthlink.net>wrote:

Meat Plow wrote:

On Fri, 18 Dec 2009 11:40:35 -0000, "N_Cook" <diverse@tcp.co.uk>wrote:

I can't say I'd noticed them before today
Is there a cross-reference anwhere ? not necessary this time but if the
printed marking is faded/damaged/burnt/ground off, another time

A batch of 1988 MJ150024 with stamped code D14 around a mounting hole
batch of 1988 MJ15025 stamp code D13
1979 MJ15003 double stamped 924 CD

I don't know if UK amp maker "Exposure" uses rebadged Motorola but marked
EXP8P (pnp) and stamped C5 in similar position
EXP8N (npn) stamped C4 in an Exposure VIII of 1988

If anyone else cares to add here a few more they have lying around it may be
useful sometime

My 1100 page 1989 Motorola bipolar power transistor data handbook
doesn't cover stamp codes. I used to have a bag of 15023/25 but used
the last pair in a Peavey MX a few months back. Peaver was notorious
for rebadging MOT parts.


Motorola was always happy to ship parts with a customer's part
number, if you bought enough parts. No need to remark them.
Click to expand...
Yeah I know Peavey themselves didn't rebadge them. I should have
worded it a bit different.

Those numbers he's seeing may indicate the set of tooling used to
seal the TO-3 can for quality control. That way they could track it
back to a particular plant or production line, along with the date
codes.
Click to expand...
 
N_Cook wrote:
Would there be a correlation between those stamp codes and the printed type
number and so of some use to repair folk or would there be too much
one-to-many mapping rather than 1 to 1? one stamp code used for dozens of
types so not much use outside Motorola.
Click to expand...

It would have no correlation, other than to the set of dies
themselves.


--
Offworld checks no longer accepted!
 
Meat Plow wrote:
. Peaver was notorious for rebadging MOT parts.
Click to expand...
To be fair, as far as I know, they stamped them with their own Peavey
spare part number, so all you had to do was quote the number to the
spares dept, who knew exactly what part you required, the same went for
pots, electrolytics etc.
I dont know what it`s like these days, but (certainly until a couple of
years ago) here in the UK, Peavey service dept are/were very helpful,
and spares very nicely priced.

Ron
 
On Sat, 19 Dec 2009 12:18:55 +0000, Ron
<ron@lunevalleyaudio.com>wrote:

Meat Plow wrote:
. Peaver was notorious for rebadging MOT parts.

To be fair, as far as I know, they stamped them with their own Peavey
spare part number, so all you had to do was quote the number to the
spares dept, who knew exactly what part you required, the same went for
pots, electrolytics etc.
I dont know what it`s like these days, but (certainly until a couple of
years ago) here in the UK, Peavey service dept are/were very helpful,
and spares very nicely priced.
Click to expand...
Been working on Peavey for nearly 30 years. They have sent me free
tech literature on numerous devices. I have a cross-reference chart of
their part# to MOT devices. As a rule I always tried to use what was
in house before making special orders. Most if not all were working
man guitar amps and other pro-audio units and our turn around time was
highly respected and took into consideration when it came time for
service. If we had the MOT badged equivalent it was used and the unit
was turned in one day.
 
"N_Kook"

I can't say I'd noticed them before today
Click to expand...
** Been there since the 1970s.

They stopped doing it in the early 90s.


Is there a cross-reference anwhere ?
Click to expand...
** Not one you can easily access.


A batch of 1988 MJ150024 with stamped code D14 around a mounting hole
batch of 1988 MJ15025 stamp code D13
Click to expand...
** Identifies the part number of the chip in the pack.

Motorola applied inked numbers at a later date, when orders were being
filled.


1979 MJ15003 double stamped 924 CD
Click to expand...
** The "924" indicates it was assembled in the 24th week of 1979.

"CD" indicates an MJ15003.

"BP" indicates a 2N3055.

"DID" indicates an MJ15024

"DIB" indicates an MJ15015

"34P" also indicates an MJ15003

"CFF" and "CFFY" indicate an MJ423

"CAH " indicates an MJ1800


All this was very important to know back in the 1980s when I first came
across a whole variety of FAKED Motorola parts at " Dick Smith Electronics
" - and also at Rod Irving Electronics with Motorola 2N3055s and MJ2955s
that had been scrubbed and relabelled as MJ15003s and MJ15004s.

Nasty business.

Lawyers even got involved.


..... Phil
 
Phil Allison <phil_a@tpg.com.au> wrote in message
news:7p5p6sFbosU1@mid.individual.net...
"N_Kook"

I can't say I'd noticed them before today

** Been there since the 1970s.

They stopped doing it in the early 90s.


Is there a cross-reference anwhere ?

** Not one you can easily access.


A batch of 1988 MJ150024 with stamped code D14 around a mounting hole
batch of 1988 MJ15025 stamp code D13

** Identifies the part number of the chip in the pack.

Motorola applied inked numbers at a later date, when orders were being
filled.


1979 MJ15003 double stamped 924 CD

** The "924" indicates it was assembled in the 24th week of 1979.

"CD" indicates an MJ15003.

"BP" indicates a 2N3055.

"DID" indicates an MJ15024

"DIB" indicates an MJ15015

"34P" also indicates an MJ15003

"CFF" and "CFFY" indicate an MJ423

"CAH " indicates an MJ1800


All this was very important to know back in the 1980s when I first came
across a whole variety of FAKED Motorola parts at " Dick Smith
Electronics
" - and also at Rod Irving Electronics with Motorola 2N3055s and
MJ2955s
that had been scrubbed and relabelled as MJ15003s and MJ15004s.

Nasty business.

Lawyers even got involved.
Click to expand...

That is the sort of correlation I was after. I take it there was a simple
correlation in the late 70s but by the late 80s it was no longer the case.
I see TO3 , RCA make ones also have such punched numbers, but more complex
spaced characters
--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/

.... Phil
Click to expand...
 
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