Motorola supplementary TO3 stamp codes
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From: N_Cook on 18 Dec 2009 06:40 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/
From: N_Cook on 18 Dec 2009 06:44 N_Cook <diverse(a)tcp.co.uk> wrote in message news:hgfpmb$qia$1(a)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/ > > > > 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
From: Michael A. Terrell on 18 Dec 2009 12:04 Meat Plow wrote: > > On Fri, 18 Dec 2009 11:40:35 -0000, "N_Cook" <diverse(a)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!
From: N_Cook on 18 Dec 2009 12:15 Michael A. Terrell <mike.terrell(a)earthlink.net> wrote in message news:NqWdnS-pmY-9K7bWnZ2dnUVZ_h9i4p2d(a)earthlink.com... > > Meat Plow wrote: > > > > On Fri, 18 Dec 2009 11:40:35 -0000, "N_Cook" <diverse(a)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! 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.
From: N_Cook on 18 Dec 2009 12:20 Michael A. Terrell <mike.terrell(a)earthlink.net> wrote in message news:NqWdnS-pmY-9K7bWnZ2dnUVZ_h9i4p2d(a)earthlink.com... > > Meat Plow wrote: > > > > On Fri, 18 Dec 2009 11:40:35 -0000, "N_Cook" <diverse(a)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! 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
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