Motorola supplementary TO3 stamp codes

be

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

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.

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Offworld checks no longer accepted!

marked

may be

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.

marked

may be

In the vintage valve/tube world these

small etched codes are very useful where the chalky printed type numbers have diasappeared off the glass envelopes

Yeah I know Peavey themselves didn't rebadge them. I should have worded it a bit different.

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

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Offworld checks no longer accepted!

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

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"

** Been there since the 1970s.

They stopped doing it in the early 90s.

** Not one you can easily access.

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

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

** 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

Electronics

MJ2955s

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

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