JIMMIE wrote:
I dont think SS was a house number. I remember using some of the SS
transistors in my military days. If I am correct they were made in the
60s and are just long time obsolete.. The ones I remember were used in
a servo amp for a mag tape drive and were bad about going out. When
the drive would fail we almost immediately would change the SS
transistors as a first course of troubleshooting since they were very
easy to change(socketed) and usually the problem.

Here is a list of transistor prefixes SS was used on Motorola silicon
transistors:

Here is a list of semiconductor prefixes.

Pro electron A... (germanium)
Prefixes in the Datenblattsammlung:AA... AC... AD... AE... AF... AS...
OUTER ONE... AY...
of the manufacturers: AEG Telefunken, SIEMENS, Sescosemsgs thomson,
VALVOPHILIPS
etc ...etc

Tnx Jimmie for this list ....very useful

Frank GM0CSZ / KN6WH