Recently Developed Point Contact Transistors! Cheap! 1953 Al

[(0]

First advertisement in Allied Catalog for Transistors? - 1953 wowzers!
The advances they have made since then.

http://www.savepic.com/freepicturehosting/is.php?i=216715&img=Allied_1953.gif

BTW if anyone has any of those Raytheon CK716's Laying around, please
email me!

 

[Watson A.Name - \"Watt Su]

(0) -^- (0) wrote:

First advertisement in Allied Catalog for Transistors? - 1953 wowzers!
The advances they have made since then.

http://www.savepic.com/freepicturehosting/is.php?i=216715&img=Allied_1953.gif

BTW if anyone has any of those Raytheon CK716's Laying around, please
email me!

Okay, so I have s few of those old point contacts laying around, what's
that mean to you?? You gonna build a crystal set?

I'm not gonna sell them to you for chickenfeed, you know.

 

[(0]

How's about posting a pic of a Raytheon CK718 and any others you have.
Do they still work? Have you tried building a amp with them?




On Sat, 24 Jul 2004 06:14:07 -0700, "Watson A.Name - \"Watt Sun, Dark
Remover\"" <nospam@dslextreme.com> wrote:

(0) -^- (0) wrote:

First advertisement in Allied Catalog for Transistors? - 1953 wowzers!
The advances they have made since then.

http://www.savepic.com/freepicturehosting/is.php?i=216715&img=Allied_1953.gif

BTW if anyone has any of those Raytheon CK716's Laying around, please
email me!

Okay, so I have s few of those old point contacts laying around, what's
that mean to you?? You gonna build a crystal set?

I'm not gonna sell them to you for chickenfeed, you know.

 

[Watson A.Name - \"Watt Su]

"(0) -^- (0)" <transistorPLEASE@REMOVEkc.rrTHISTOREPLY.com> wrote in
message news:41034220.89427475@news-server.kc.rr.com...

How's about posting a pic of a Raytheon CK718 and any others you have.
Do they still work? Have you tried building a amp with them?

My error, one of them is a 2N112/CK760, the others are CK722s or else
unmarked but in the same package. Have I built? Are you serious?
Their performace is so mediocre that they're nearly worthless for
anything needing a transistor nowadays.

I will post a pic of some of them to ABSE.

On Sat, 24 Jul 2004 06:14:07 -0700, "Watson A.Name - \"Watt Sun, Dark
Remover\"" <nospam@dslextreme.com> wrote:

(0) -^- (0) wrote:

First advertisement in Allied Catalog for Transistors? - 1953
wowzers!
The advances they have made since then.


http://www.savepic.com/freepicturehosting/is.php?i=216715&img=Allied_195

3.gif

BTW if anyone has any of those Raytheon CK716's Laying around,
please
email me!

Okay, so I have s few of those old point contacts laying around,
what's
that mean to you?? You gonna build a crystal set?

I'm not gonna sell them to you for chickenfeed, you know.

 

[(0]

I have built amps from 50 year old CK722's and they work fine. There
is lots of Germainum hiss and noise but they work okay. I have only
came across a few ancient transistors that did not test original spec
or very close to it. One of the things that interests me is the
longevity of these guys. After all, the companies making them really
had no idea how long they would last. I know that some of the early
articles I have read question how long a transistor will last compared
to a vacuum tube! HAH! The only ones I have had probelms with are not
hermetically sealed. I have cut some open and looked at the junction
under a small microscope. It looks like plain old corrosion did them
in.

Here is an amplifier built from point contact transistors (2N23's).
WOW! Too bad they don't provide a sound sample.

http://semiconductormuseum.com/ConstructionProjects/ConstructionProjects_PointContact_AudioAmp.htm

I know that some guitar fuzz/effects pedals still use germanium
transistors presumably for the high noise and distortion?! Don't know
if this is a golden ear type thing or if it is something that a
germanium transistor actually works better for. I am not a guitar
person. One of the pedals that uses Ge transistors is called Fuzz
Face.

I have recently built several older radio and various hobby projects
using CK722 / 2N107's, 2N170, 2N404, 2N414's..etc. Something about
making an old transistor work again after 50 years is just appealing
to me. Also all of the different case styles and types is
interesting. Nothing beats the blue CK722 though. Back in the 50's
most kids figured there was something special about them and that a
radio built with a blue or silver CK722 was obviously superior. The
truth is funny that they were actually factory rejects..heh. I guess
that is the power of branding. Credit to Raytheon for continuing to
sell the transistor and the CK722 brand for so many years.

Found a color photo of a CK716 here:

http://users.arczip.com/rmcgarra2/index.html

That is a great website! His collection is incredible.

I really do think they have value as collectibles. Most people think
they are junk, but then there has been a time in lots of collectibles
history when they were thrown out as trash and now are very valuable.
You just have to think about how important transistors are to the
modern world and how much they have changed society to see possible
future value.



On Sun, 25 Jul 2004 10:15:12 -0700, "Watson A.Name - \"Watt Sun, the
Dark Remover\"" <NOSPAM@dslextreme.com> wrote:

"(0) -^- (0)" <transistorPLEASE@REMOVEkc.rrTHISTOREPLY.com> wrote in
message news:41034220.89427475@news-server.kc.rr.com...
How's about posting a pic of a Raytheon CK718 and any others you have.
Do they still work? Have you tried building a amp with them?

My error, one of them is a 2N112/CK760, the others are CK722s or else
unmarked but in the same package. Have I built? Are you serious?
Their performace is so mediocre that they're nearly worthless for
anything needing a transistor nowadays.

I will post a pic of some of them to ABSE.


On Sat, 24 Jul 2004 06:14:07 -0700, "Watson A.Name - \"Watt Sun, Dark
Remover\"" <nospam@dslextreme.com> wrote:

(0) -^- (0) wrote:

First advertisement in Allied Catalog for Transistors? - 1953
wowzers!
The advances they have made since then.


http://www.savepic.com/freepicturehosting/is.php?i=216715&img=Allied_195
3.gif

BTW if anyone has any of those Raytheon CK716's Laying around,
please
email me!

Okay, so I have s few of those old point contacts laying around,
what's
that mean to you?? You gonna build a crystal set?

I'm not gonna sell them to you for chickenfeed, you know.

 

[Watson A.Name - \"Watt Su]

"(0) -^- (0)" <transistorPLEASE@REMOVEkc.rrTHISTOREPLY.com> wrote in
message news:410414b8.143348041@news-server.kc.rr.com...

I have built amps from 50 year old CK722's and they work fine. There
is lots of Germainum hiss and noise but they work okay. I have only
came across a few ancient transistors that did not test original spec
or very close to it. One of the things that interests me is the
longevity of these guys. After all, the companies making them really
had no idea how long they would last. I know that some of the early
articles I have read question how long a transistor will last compared
to a vacuum tube! HAH! The only ones I have had probelms with are not
hermetically sealed. I have cut some open and looked at the junction
under a small microscope. It looks like plain old corrosion did them
in.

Here is an amplifier built from point contact transistors (2N23's).
WOW! Too bad they don't provide a sound sample.


http://semiconductormuseum.com/ConstructionProjects/ConstructionProjects

_PointContact_AudioAmp.htm

I know that some guitar fuzz/effects pedals still use germanium
transistors presumably for the high noise and distortion?! Don't know
if this is a golden ear type thing or if it is something that a
germanium transistor actually works better for. I am not a guitar
person. One of the pedals that uses Ge transistors is called Fuzz
Face.

I have recently built several older radio and various hobby projects
using CK722 / 2N107's, 2N170, 2N404, 2N414's..etc. Something about
making an old transistor work again after 50 years is just appealing
to me. Also all of the different case styles and types is
interesting. Nothing beats the blue CK722 though. Back in the 50's
most kids figured there was something special about them and that a
radio built with a blue or silver CK722 was obviously superior. The
truth is funny that they were actually factory rejects..heh. I guess
that is the power of branding. Credit to Raytheon for continuing to
sell the transistor and the CK722 brand for so many years.

Found a color photo of a CK716 here:

http://users.arczip.com/rmcgarra2/index.html

That is a great website! His collection is incredible.

I really do think they have value as collectibles. Most people think
they are junk, but then there has been a time in lots of collectibles
history when they were thrown out as trash and now are very valuable.
You just have to think about how important transistors are to the
modern world and how much they have changed society to see possible
future value.

I agree with a lot of what you say. But I drove an older vehicle around
for decades and I do _not_ fondly remember having to dry out the drum
brakes after every rain puddle. Now, I wouldn't go back to a non-ABS
brake vehicle for anything.

I use that to compare the old germanium transistors. Their performance
is much less than any 2 cent silicon transistor of today. Sure, you can
have fun with them, as I did way back when I built my first kit, a
SupereX transistor radio. It was essentially a xtal set with an audio
amp after it. Well, I lived in a neighborhood just a mile or two from a
50kW AM radio station right in the middle of the dial, and just about
the whole dial was occupied by that one radio station until dark, when
it shut down for the night. So my radio kit was worthless for most of
the day. Unless, of course I wanted to listen to that one radio
station. But hey, I was into rock and roll, and it wasn't. ;-)

After many years dealing with tubes, I later graduated to all the
germanium transistors that I could get my hands on. I did a lot of
preamps, audio amps, and stuff. So I share your thoughts in that
respect, been there, done that, too. But then along came the 2N706 and
then later 2N3904.. And I haven't looked back. I get a whole lot more
joy out of using the silicons.

On Sun, 25 Jul 2004 10:15:12 -0700, "Watson A.Name - \"Watt Sun, the
Dark Remover\"" <NOSPAM@dslextreme.com> wrote:


"(0) -^- (0)" <transistorPLEASE@REMOVEkc.rrTHISTOREPLY.com> wrote in
message news:41034220.89427475@news-server.kc.rr.com...
How's about posting a pic of a Raytheon CK718 and any others you
have.
Do they still work? Have you tried building a amp with them?

My error, one of them is a 2N112/CK760, the others are CK722s or else
unmarked but in the same package. Have I built? Are you serious?
Their performace is so mediocre that they're nearly worthless for
anything needing a transistor nowadays.

I will post a pic of some of them to ABSE.


On Sat, 24 Jul 2004 06:14:07 -0700, "Watson A.Name - \"Watt Sun,
Dark
Remover\"" <nospam@dslextreme.com> wrote:

(0) -^- (0) wrote:

First advertisement in Allied Catalog for Transistors? - 1953
wowzers!
The advances they have made since then.



http://www.savepic.com/freepicturehosting/is.php?i=216715&img=Allied_19
5
3.gif

BTW if anyone has any of those Raytheon CK716's Laying around,
please
email me!

Okay, so I have s few of those old point contacts laying around,
what's
that mean to you?? You gonna build a crystal set?

I'm not gonna sell them to you for chickenfeed, you know.