Identifying a transistor

[MordechaiBenZev]

There are some transistors up for sale right now on Ebay that have a package I haven't seen before. A cross between a TO-1 and TO-5.  This one is billed as an OC71N...but I can't tell the manufacturer.  Is anybody familiar with this? 

[mozz]

SFT?

[MordechaiBenZev]

I always thought the SFT packages were a bit more elongated.  This looks a touch more like a TI 2G3xx series.  In any case it looks like the "OC71N" is a post-production restamp, but I may well be wrong about that.

[tonyharker]

Genuine OC71s (Mullard/Philips) were always in a black glass package. This one appears to be a remarked something.  Looks like an AC128 package. Telefunken?

[Rob Strand]

In the pic here you can see a large logo on one side.  I can't quite make it out.

https://www.radiomuseum.org/tubes/tube_oc71.html


[Actually it says manufacturer SI under the pic]

[PRR]

I don't think "TO1" was ever a formal standard. It was retro-fitted to several existing similar commercial packages after JEDEC got their transistor staff organized. "TO-1" may be flat or dome on top, straight or flanged on bottom. It is probably the product of a button-shank machine, adapted as each maker saw fit.

[duck_arse]

it looks as tho the case has an emitter tag, in which case it would appears to be over the collector pin. I've only ever seen germs pin-marked on the collector, I think.