STA5141 , TO5 transistor from 1974
N_Cook
it, just maybe STA6141, a bit indistinct
N_Cook
news:i38htv$pbu$1...@news.eternal-september.org...
> In the pa of HH HA100 amp from 1974, probably ok but cannot find any info
on
> it, just maybe STA6141, a bit indistinct
>
>
Logo on this and the other contemporaneous TO5 of 2N3440 and 2N5415 is
indistinct that at first sight looks like curvey M but is STT or SIT or STI
with shaded and sloping capital letters melded together
Arfa Daily
"N_Cook" <div...@tcp.co.uk> wrote in message
news:i38jil$uni$1...@news.eternal-september.org...
Wasn't STT one of Thomson's before they became Thomson Microelectronics, or
some such ?
Arfa
N_Cook
news:Jw26o.18757$MQ3.15750@hurricane...
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
John Robertson
> In the pa of HH HA100 amp from 1974, probably ok but cannot find any info on
> it, just maybe STA6141, a bit indistinct
>
>
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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N_Cook
news:n6j6o.10624$z%6.92@edtnps83...
I will try photos of the logo later today
HH , logo H||H on my screen H 2 vertical bars H
http://www.hhamplification.co.uk/history.asp
I think H&H is a different company
N_Cook
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)
http://diverse.4mg.com/STA5141_logo.jpg
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
N_Cook
or UK STC Standard Telephones and Cables
interesting info
http://homepages.nildram.co.uk/~wylie/STC/STC.htm
different logo again
Ross Herbert
:I decided to remove the cover on the output pair and the same shaded logo
:
This looks to me like STC - but not the ITT company. It is Silicon Transistor
Corporation http://freespace.virgin.net/matt.waite/resource/logos/logo4.htm
Page from short form catalog
http://www.datasheetarchive.com/pdf/getfile.php?dir=Databooks-1&file=17-8.pdf&scan=
N_Cook
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
Ross Herbert
wrote:
:
:This looks to me like STC - but not the ITT company. It is Silicon Transistor
:Corporation http://freespace.virgin.net/matt.waite/resource/logos/logo4.htm
:
:Page from short form catalog
:http://www.datasheetarchive.com/pdf/getfile.php?dir=Databooks-1&file=17-8.pdf&scan=
STC was acquired by New England Semiconductor and then by Microsemi
http://www.sherlab.com/index.htm?/electronics/ss.html