Transistor marking

[wn1fju]

Transistor is marked TS3011.  I am interpreting the last two digits as a "European" one.  Here in the USA, our ones are simply straight lines.  The data sheet for a  2N3011 says "an NPN transistor designed for ultra-high speed saturated switching applications."  The transistor is from an Adret (French) frequency synthesizer and this transistor is connected to a 74LS90 counter chip, so it makes sense that it needs to switch some high frequency stuff. 

But has anyone heard of a TS3011 and is a 2N3011 a suitable substitute?

[wn1fju]

Oops - I found the manual.  Even though the schematics show TS3011, the parts lists shows 2N2369 which are readily available.  We will go with that.

[amyk]

Is that a 1964 datecode?

[wn1fju]

"Is that a 1964 datecode?"   Could be, but it looks like a Texas Instruments logo on the can, and I'm not an expert on when TI first started producing transistors. 

I've attached a snippet of the schematic, dated 1967.  Have never seen a schematic with transistors drawn quite like that.

[fzabkar]

I'm not an expert on when TI first started producing transistors.

https://mirrorservice.org/sites/www.bitsavers.org/components/ti/_dataBooks/

[amyk]

TI started making transistors in the 50s... and given your schematic shows a date of '67, a '64 datecode would certainly not be unusual. But looking at this page, the 3-digit "640" datecode may actually be 1966, 40th week:
https://sites.google.com/site/transistorhistory/Home/us-semiconductor-manufacturers/ti