Hey guys, are these Germanium diodes? And why does one have 744 stamped on it and the other 754? Also, what kind of diode is the one at the bottom with the yellow line on it? Thanks a lot!

 

Zener

1N4744

1N4754

 

1N4744 is a 15V Silicon Zener diode.
1N4754 is a 39V Silicon Zener diode.

 

Wow quick replies! Thanks so much guys.

I'm trying to salvage some Germaniums, what would be best to rip apart to find some? A radio? Would a 2-way, 40 channel walkie talkie contain any?

 

Old Radios may be.

 

Look for things made before about 1965. I was able to pull some off of logic boards made in the early 1960's.

 

when unsoldering, be careful and quick, germanium diodes have lower temprature tolerance than silicon.

 

They are still being made and fairly inexpensive. So why not get new ones in the value you need for your project? Then you know they are good ones too.

https://www.google.com/search?q=germainium+diode&ie=utf-8&oe=utf-8

 

Went ahead and grabbed some off eBay, can't really go wrong with $1.29 free shipping, I don't come across any 1960's electronics in my area anyway. Thanks guys appreciate it.