STA5141 , TO5 transistor from 1974

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Logo on this and the other contemporaneous TO5 of 2N3440 and 2N5415 is indistinct that at first sight looks like curvey M but is STT or SIT or STI with shaded and sloping capital letters melded together

Wasn't STT one of Thomson's before they became Thomson Microelectronics, or some such ?

Arfa

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I cannot be sure it is STT logo, I would not say it was STC , no C at the end. There was an STC STA9... range. Anyway for anyone meeting one in earnest it is TO3, NPN, "D" pinning EBC and probably 300V rating like the others in that area

Perhaps a hi-resolution picture uploaded somewhere of the transistor?

I see nothing in my 1979 D.A.T.A (Edition 46) Book for anything like ST*5141.

Also who is HH?

John :-#)#

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I will try photos of the logo later today HH , logo H||H on my screen H 2 vertical bars H

I think H&H is a different company

I decided to remove the cover on the output pair and the same shaded logo there reads definitely STC, so presumably before the rasterfied form of their logo. TO3 devices marked 9029 and date code also 7429

That 'dropped' piece of white in the TO5 logo stamps , at the end (beware intrusive Java on this hosting site)

is consistent on all of the TO5 so perhaps a broken stamp The STA 5141marked device is in an awkward position to photo.

Remnant of H&H I think is printed on the front Al girder, so not a different company. When was the last time anyone saw a fully working ZnS electrophosphorescent panel on these (not HA100) MA100 amps? Is the oily feel but not oily smelling coating over the boards inside , broken down conformal coating, or owner squirting Snibbo (Spike Milligan TM) everywhere

Was it US STC = Silicon Transistor Corporation or UK STC Standard Telephones and Cables interesting info

different logo again

:I decided to remove the cover on the output pair and the same shaded logo :there reads definitely STC, so presumably before the rasterfied form of :their logo. TO3 devices marked 9029 and date code also 7429 : :That 'dropped' piece of white in the TO5 logo stamps , at the end :(beware intrusive Java on this hosting site) :

:is consistent on all of the TO5 so perhaps a broken stamp :The STA 5141marked device is in an awkward position to photo. : :Remnant of H&H I think is printed on the front Al girder, so not a different :company. When was the last time anyone saw a fully working ZnS :electrophosphorescent panel on these (not HA100) MA100 amps? :Is the oily feel but not oily smelling coating over the boards inside , :broken down conformal coating, or owner squirting Snibbo (Spike Milligan TM) :everywhere :

This looks to me like STC - but not the ITT company. It is Silicon Transistor Corporation

Page from short form catalog

I picked up my 1976 D.A.T.A transistor book , back face up and it has on the back, a full page ad for Silicon Transistor Corporation devices, with that logo (undisplaced C-top) but no reference to those sorts of numbers on that page or inside pages. Maybe export versions

On Thu, 05 Aug 2010 17:59:08 +0800, Ross Herbert wrote: : :This looks to me like STC - but not the ITT company. It is Silicon Transistor :Corporation

: :Page from short form catalog :

STC was acquired by New England Semiconductor and then by Microsemi