jimlux-And you can probably still buy 709 and 714 op-amps..
I'm old enough to know that it is 741 op-amps, not 714. ;-)
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Hi
ua709 = tough to find in production today.
ua741 = ST (and others) will sell you all you want brand new
ua714 = tough to find when it was brand new
Bob
On Apr 20, 2010, at 7:43 AM, Arthur Dent wrote:
jimlux-And you can probably still buy 709 and 714 op-amps..
I'm old enough to
Arthur Dent wrote:
jimlux-And you can probably still buy 709 and 714 op-amps..
I'm old enough to know that it is 741 op-amps, not 714. ;-)
I'm old enough to type 714 when I mean 741.
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Bob Camp-ua714 = tough to find when it was brand new
Yes, but for years the 709 and 741 were ubiquitous and the 741
is still alive and doing well today. The 714 is an asterisk, much
like the GAP Scientific K2-Ws I probably still have lying around.
I once owned a complete GAP analog computer
Since many of us are not so old as I am, and aren't familiar with the
PDP-11 family, I should have mentioned that this happened in the middle
80's.
Uno Staver wrote:
We bought a bunch of PDP-11/23s as part of a communications network
system. After successful acceptance tests in Boston, MA,
Anyone remember the CK722 transistor? As I remember they were about $7.50, a
considerable sum.
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Ah, but can you still buy u702's?
-John
Rob Kimberley wrote:
Am I really that old?!!?
:-)
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Chuck Harris
Sent: 19 April 2010 10:10 PM
To: Discussion of precise
I still have a dozen or more unused CK722 transistors.
John WA4WDL
--
From: John Green wpxs...@gmail.com
Sent: Tuesday, April 20, 2010 9:29 AM
To: time-nuts@febo.com
Subject: [time-nuts] And you thought you were old
Anyone remember the CK722
Yep...built my first radio with one of those.
$7.50 then is what, about $150 today?
Regards,
Tom Holmes, N8ZM
Tipp City, OH
EM79xx
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of John Green
Sent: Tuesday, April 20, 2010 9:30 AM
To:
If, by GAP you mean Philbrick, my graduate thesis advizor designed their
machines and wrote the Palimpsest on Operational Amplifier Circuits.
-John
=
Bob Camp-ua714 = tough to find when it was brand new
Yes, but for years the 709 and 741 were ubiquitous and the 741
is
Now you have me trying to remember who made them...Raytheon?
Regards,
Tom Holmes, N8ZM
Tipp City, OH
EM79xx
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of jmfranke
Sent: Tuesday, April 20, 2010 9:43 AM
To: time-nuts@febo.com
Subject:
Ding! Ding! Ding! We have a winner!
-ls-
Tom Holmes, N8ZM thol...@woh.rr.com wrote:
Now you have me trying to remember who made them...Raytheon?
Regards,
Tom Holmes, N8ZM
Tipp City, OH
EM79xx
-Original Message-
From: time-nuts-boun...@febo.com
Yep - Raytheon. I think most of us on here probably used them. I still have
100s, but I collect transistors amongst just about everything else. My other
favorite was the Philco SB-100. Used one for a 10 meter superegen in the
early 60's. Could hear the whole world on it with a piece of wire.
Do you know the story of the CK722?
In the 1950s, Raytheon was making tiny transistors for hearing aids to
replace the pre-WW II subminiature tubes.
Aside: Those tubes, developed by Norm Krim, were ruggedized and used in
the WW II Proximity Fuzes, one of THE big inventions of WW II.
Anyway,
In fact, one of the first CK-722s that I took apart did have a smaller
hearing aid type transistor inside. Later CK-722s were of course built as
CK-722s and even later they were in black but somewhat clear epoxy cases. -
73 - Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960
there.
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'59 was one of the biggest peaks of propagation if I remember being told by my
OT Elmer Les vu2ak.
10W AM to the US from VU.
early 60's. Could hear the whole world on it with a piece of wire.
Conditions on 10 were great then. 73 - Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
At 08:56 AM 4/20/2010, J. Forster wrote:
Do you know the story of the CK722?
In the 1950s, Raytheon was making tiny transistors for hearing aids to
replace the pre-WW II subminiature tubes.
Aside: Those tubes, developed by Norm Krim, were ruggedized and used in
the WW II Proximity Fuzes, one
Horst wrote:
Now when I see one of the old black Philips glass encapulated
transistors, I get quite nostalgic.
But this days one hardly looks at a modern transistor anymore.
I know it's way off topic, but I really /did/ use the OC42 in clocks ...
some of them are OC42m ...
--
I
John Green wrote.
Anyone remember the CK722 transistor?
Yes. I have a couple of them in my collection of antique parts along with
several selenium rectifiers and a few 1N21s..
Regards.
Max. K 4 O D S.
Email: m...@maxsmusicplace.com
Transistor site http://www.funwithtransistors.net
Hi
My second home computer was a PDP=11/20. The first was a PDP-8E. Both are
long gone...
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Uno Staver
Sent: Tuesday, April 20, 2010 8:28 AM
To: Discussion of precise time and
Other Chips
Single Comp uA710
Dual Comp uA711
Voltage Reg uA723
-John
=
Arthur Dent wrote:
jimlux-And you can probably still buy 709 and 714 op-amps..
I'm old enough to know that it is 741 op-amps, not 714. ;-)
Ooops..
it was early in the morning
And
I once heard a story from a man who burned out half the transistors in the
world. He worked at Bell labs and had built an amplifier using three of the
six transistors that had come out of an initial prototype run. Something
shorted and burned out all three. I briefly exchanged emails with
Norm did not invent the fuze. His contribution was the tubes that made it
prectical. The Dopplar technique was British, as I remember.
There is a video up on MIT's TechTV that shows the submini tube
manufacturing line. Norm is in that.
-John
===
At 08:56 AM 4/20/2010, J.
No PLT (or much else) QRM then either.
See http://plt.g7cnf.me.uk/faq.htm for some info.
Not my site, but one that is easier to read and get a grip on the
subject. This stuff can seriously screw up all sorts of things,
especialy if you have to use something like WWV at any time with a PLT
Hi
The ua723 obviously is the one destined to outlive the cockroaches. The
linear power supply industry still seems to consider them state of the
art.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of J. Forster
Sent: Tuesday, April
IMO, they are all good parts. The only down side to the 710/711 was the
odd (-) supply required.
-John
==
Hi
The ua723 obviously is the one destined to outlive the cockroaches. The
linear power supply industry still seems to consider them state of the
art.
Bob
life speed wrote:
Time Nuts;
I have a customer request for a microwave frequency synthesizer with extreme
accuracy requirements;
4 X 10^-11, or 0.04 PPB. Obviously this is way out of quartz oscillator
territory.
Is GPS 1 pulse-per-second useable, or do they need an atomic clock?
Maybe they
Hi
What is their calibration interval and environment?
With GPS you will have the usual when locked and stable disclaimer. With
some cost / effort you can get limited holdover at that level.
For a true good for a year/running autonomously, type spec - you need a
cesium standard. Getting one
Got my license in 1952 and the propagation was unbelievable on 10 and 20
meters into the 60's.
Bill S
W2FMA
Raj wrote:
'59 was one of the biggest peaks of propagation if I remember being told by my
OT Elmer Les vu2ak.
10W AM to the US from VU.
early 60's. Could hear the whole world on
Hi Magnus, Life speed,
what does accuracy mean? Average (rms, 1-Sigma) frequency accuracy? If yes,
over what time frame is the average?
Or is this the peak to peak allowable deviation? Over what temperature
range, and after how long of a warmup?
To give you an example, a typical Fury
Bob Camp wrote:
Hi
The ua723 obviously is the one destined to outlive the cockroaches. The
linear power supply industry still seems to consider them state of the
art.
Bob
Like the 555, it has a nice combination of function and predictability.
It's in that good enough category.
Hi
What ever generation the 723 was, the 555 is at least one generation later. As
I recall the 555 was the first chip to be forward priced when Signetics
introduced it.
Bob
On Apr 20, 2010, at 9:52 PM, jimlux wrote:
Bob Camp wrote:
Hi
The ua723 obviously is the one destined to outlive
life speed wrote:
Time Nuts;
I have a customer request for a microwave frequency synthesizer with
extreme accuracy requirements; 4 X 10^-11, or 0.04 PPB. Obviously
this is way out of quartz oscillator territory. Is GPS 1
pulse-per-second useable, or do they need an atomic clock? Maybe
they
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