I’ve had a lot of trouble finding transistors from the usual places and them not being fake, so I wanted 2SD669A & 2SB649A also 2SC3241 & 2SA1358, I decided to try Cricklewood I’ve used them many times especially in the late 70’s & 80’s and always been fine, but 2 of the transistors 2SD669A look like they are made by Hitachi as it has there good old logo on it, my question is has anyone used these transistors (which are not made like the good old days brass based tinned in silver that’s how I remember all the transistors like BD131 BD433 BD140 etc etc and many power it’s) and work fine I’m sure if you used them for low voltage low current switching they should be fine.
The amplifier voltage rails are +55 -55 so when they blow they go with a bang 110volt so fakes take off.
Here are the pictures
The amplifier voltage rails are +55 -55 so when they blow they go with a bang 110volt so fakes take off.
Here are the pictures
Attachments
Cheap TO126 versions (Chinese) use kovar, because it is cheap and easy to work with. The original Philips used pure copper with the typical grey silicone molding compound, and others used alloys, but I am not sure a metallurgist would call them "brass", as brass has issues of metal migration in the presence of tin. They were not magnetic anyway; kovar is magnetic
Thanks for the reply sorry i did mention brass sorry i did mean copper because of its great heat characteristics, the price difference is shocking when i can buy the kovar made transistors for from AliExpress for about 12p each then order the same transistors from a UK firm and pay £3.30 plus postage.
Fault finding is one thing but fault finding dodgy new devices can make you pull all you're hair out.
Hope you notice the fatal flaw in that statement. 🙂
Same thing.
What logo did you say you wanted? 😉
Even easier if you have a Laser engraver.
