UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Boulevardier · 18th Sep 2017, 1:43 am

I have a batch (about 10) 2N3055s, bought as NOS back in 2003. Some have now got tiny traces of rust on the cases (the "can" part of the case rather than the bolted flange). Is this unproblematic - i.e. is the can part normally made of steel?".

Also, would it be possible to tell by inspecting the die of one of them ("sacrificed" for the purpose by cutting off the can) whether it is -
1. earlier homotaxial type (Ft about 2.5 MHz)
2. later epitaxial type (higher Ft)
3. just a good old fashioned fake?

Thanks if you can help.

Mike

18th Sep 2017, 1:43 am	#1
Boulevardier Octode Join Date: Sep 2017 Location: Bristol, UK. Posts: 1,654	2N3055 Transistors. I have a batch (about 10) 2N3055s, bought as NOS back in 2003. Some have now got tiny traces of rust on the cases (the "can" part of the case rather than the bolted flange). Is this unproblematic - i.e. is the can part normally made of steel?". Also, would it be possible to tell by inspecting the die of one of them ("sacrificed" for the purpose by cutting off the can) whether it is - 1. earlier homotaxial type (Ft about 2.5 MHz) 2. later epitaxial type (higher Ft) 3. just a good old fashioned fake? Thanks if you can help. Mike