开云体育

From: TekScopes@... [mailto:TekScopes@...]On
Behalf Of larrys@...

Chuck Harris <cfharris@...> wrote:

I have an old PDP8/E with a TU56 dectape drive. In the
spirit of tektronix, I am looking for a 4010 to use with
it.

I *had* an LI-1000E clone of an IBM 1130, complete with 29M
12 platter top loading disk packs. It was card input (had the 029
keypunch, too) and had a 600lpm band printer. 'twas operational
in my living room. My oldies these days are considerably smaller
and newer. PDP8's & 11's are wonderful pieces of history. In fact
pretty much anything DEC made is nifty.

My first job was at a small laser scribing/trimming
shop, and my first task there was to build a plug-in
board for a PDP-8/e that would interface to an X-Y
positioning table. I remember how well-written the
DEC manual was, and how straightforward the circuit
design. The interface took me only a few days and
worked the first time. I'm not bragging - it was
mostly thanks to DEC.

Later when I was doing custom mods for Tek's
Information Display division, I regularly assembled
terminal firmware on an 11/45 running RSTS. Collecting
a printout, I would often snag on the front panel lights,
just gazing mesmerized as they went through their
tail-chasing idle pattern.

Nearby was a small photo lab, with a "RotoTrack" (sp?)
lightlock door. Some wag had put up a picture from the
Woody Allen movie "Sleeper" showing Woody emerging in a
somewhat disorganized state from the "Orgasmatron",
which bore an uncanny resemblance to the Rototrack.

Dave

From: TekScopes@... [mailto:TekScopes@...]On
Behalf Of arthurok_2000

are those ever availible?
looks like alot better unit then a comparable hp 9825a
and the tek basic is fantastic for its day

Around 1980, I used a 4051 day in, day out.
It always seemed like a friend. Another department
had a 9825A. I poked at it a few times, but found
it quite impenetrable.

Dave

Does anyone have an Eprom reader and burner available? I need to have a
74S288 read and 4 pieces burned with the same image. I am happy to pay one
of the group to do it for me.

Thanks in advance



Joe Gisler

Dr. H. J. Gisler

Vector Associates

3580 N Barkley Road

Apache Junction, AZ 85219

480-288-6660
480-288-6661 fax

480-206-4999 cell
gislerhj@...

vectorassociates@...

try deane kidd

Greetings,

I have a need for a small slide switch(tek part number 260-1470-00). The part was made by Illinois Tool Works inc., pn 23-021-309. The ITW web site search does not respond to that number. That really t's me off when manufactors drop references for old products.

If someone has a source or cross-reference, please respond.

Jerry

2SC2909 RF, AF Silicon EP NPN Vcbo=180volts Vceo=160volts Ic=70mA Pw=600mW fT=150Mhz in grounded base operation basic specs from my 1986 Japanese transitor manual.

Consolidated Electronics has them for 38 cents each or 10 for $2.80 in the US. They also list an Alternate type as being 2SC1473 which is listed as 250 Volts - collector / base 200 Volts - collector / emitter 70mA collector current 600mWatts and an fT of 80 MHZ in grounded base operation.

Rex

On Wednesday 07 February 2007 19:05, you wrote:

Thanks. You beat me to the second question! I did wanna know if I
could "upgrade" knowing that better op-amps exist.

Interesting note about "anything with banana plugs" is that when
playing around with the AM501 plugins was a sensitivity of the output
based upon the proximity of my hand near the jacks. Wild and crazy
things would happen as I got anywhere near 'em, sorta. One was much
more sensitive than the other.

Do ya have any recommendations for a replacement. I'd even be willing
to spend more than the few cents that some of these cost--maybe even
like $5--15 per chip!

Well, the deal is this: there's no easy way to get performance out of a better
chip if you have large, uncontrolled and *variable* parasitics. That's what
your hand waving is :)

The way to fix it is to use your op amp in the circuit, not in the plugin.

A faster op-amp may even start oscillating just from the fact that it's inside
of the AM501 wiring harness. Probably the only road to improvement is to use
a similarly slow op-amp, but a more DC-accurate one. The AM501 is not really
useable for much beyond simple school-type experiments. It wasn't meant to
be! It was specifically designed for use in educational setting AFAIK.

I have lots of unused OP177 chips, if you want a few just let me know
off-list. They are good replacements for 741 and friends -- similarly slow,
but much more precise.

Cheers, Kuba

Hi Arthur,

I am currently using a laptop to act as the console terminal. It works
just fine, but then again, the laptop works better and is decades faster
than the 8/E, so might just as well not use the 8/E at all!

I am looking for a console terminal that is age appropriate to the 8/E.
A 4010, or 4012 looks nice, and was used on 8/E's in the research world.
At least the 4010 is built with ttl chips, like the 8/E.

A DecWriter or ASR33 would be more authentic, though.

-Chuck

arthurok wrote:

On Wednesday 07 February 2007 18:39, you wrote:

My late father used to say "Why do it simply, when complicated works
well too" (It looses something in translation)

I guess it was "Warum einfach wenn Mann komplizieren kann" or somesuch. My
German is pretty rusty.

To me, using an unknown scope is complicating things. Mind you, I wasn't
anywhere advocating a full calibration -- just a decent enough check to make
sure that your 100MHz mainframe and preamps are where they are supposed to
be.

Maybe my problem was that I was almost always getting the mainframes and
plugins separately, and the plugins were always in lots and always seemed to
be someones "reject" pile. 90% of them calibrated just fine, though.

I guess the proper advice would be: get a 7603 with plugins, coming out of
service in a lab somewhere, with a calibration sticker with dates in last 7-8
years. That'd be safe enough I guess.

Kuba

You don't NEED anything like an RF RMS voltmeter. or phase detector. A
diode probe on a VTVM or very minimal scope will do just fine. You tune
for the typical 'rabbit ears' [flat phase] response.

Phase MIGHT be important in a wide band microwave communication system
using BPSK or QPSK or NPSK, but not in audio gear.

Hmm, I've been tuning a lot of 2nd order 500Hz low pass Bessel filters and the
most accurate way of tuning them was to tune for proper phase at cutoff
frequency. IIRC it was supposed to be 45 debgrees. Frankly said, I don't
quite know how else I'd go about tuning them anywhere near same accuracy -
you can detect small phase changes very well, while detecting the peak of
amplitude response *to the same accuracy* is kinda hard.

I've seen a similar thing in narrow bandpass filters: the peak of the response
is where your amplitude envelope slope is zero, so by minimally tweaking the
tuning you get close to zero change in amplitude. So the only way I found to
do such tuning with good accuracy was to look at phase. But then I didn't
really have much RF experience, so I may be talking complete BS. I'm only
relating what has worked for me.

Cheers, Kuba

Well Johnny,
You already discover the name of the game. I did that some year ago looking
onto Ebay stuff...
Now with (I think) 5Hz min BW and 100dB dynamic range how it is not "good
enough" to read audio distortions dB down (max up to 100dB down) from the
carrier?
I think this HP machine is as powerful as todays Microwave Spectrum Analyzers
with similar parameters dealing with RF.


Greg


At 04:43 AM 2/8/07 -0800, Johnny Chapman wrote:

Greg, ahhhhhhhhh the HP 3581A. Read that they are
good thingies. The price on 'em is good too. I'd
prefer a 3580A w/ the crt.

However, they aren't that great at S/N measurements of
some modern digital sources and killer amplifiers.

I'd really like to know how an Tek AF501 would compare
to the 3581A. You can surely get an 3581A more
cheaply and consistenly.

Yeah! Audio Discussions on my B-Day! 33 years old!
Hee Hee; I'll be 40 and dirt before ya know it
(definitely no age bashing here; just little fun; I
respect age/wisdom and wanna live way out yonder!).

Laters.

__________________________________________________________
Want to start your own business?
Learn how on Yahoo! Small Business.

<>

Emacs!

I am trying to source Some Japnese transistors or get some

equivalent

info. ( 2SC2909)
Any help most welcome

Available in the UK from for 20p each (40cents).

Craig

Greg, ahhhhhhhhh the HP 3581A. Read that they are
good thingies. The price on 'em is good too. I'd
prefer a 3580A w/ the crt.

However, they aren't that great at S/N measurements of
some modern digital sources and killer amplifiers.

I'd really like to know how an Tek AF501 would compare
to the 3581A. You can surely get an 3581A more
cheaply and consistenly.

Yeah! Audio Discussions on my B-Day! 33 years old!
Hee Hee; I'll be 40 and dirt before ya know it
(definitely no age bashing here; just little fun; I
respect age/wisdom and wanna live way out yonder!).

Laters.




____________________________________________________________________________________
Want to start your own business?
Learn how on Yahoo! Small Business.

Thanks for the post Ash!

Check the specs on the Sencore SG80. I believe it to
be a bit better and a younger product by maybe ten
years. I hardly use it, but when needed, BAM! I
generally am brand loyal almost to a fault!

I've first seen them in the install/maintenance bays
of GM dealerships. AC/Delco is the parent company of
Rockford-Fosgate!




____________________________________________________________________________________
Yahoo! Music Unlimited
Access over 1 million songs.

On Thu, 08 Feb 2007 03:21:49 +0100, arthurok <arthurok@...> wrote:

because of modern technology
you arent paying very much for all those modes
the software programming is amortized over a tremendous number of units

And they don't seem to test the software at all, ever, so that saves lotsa money too! ;-)

ST

Hi,

it's available in germany for 0.52??? each.

BR,
Michael

-------- Original-Nachricht --------
Datum: Thu, 08 Feb 2007 07:50:38 -0000
Von: "m8jpk" <ttesenq@...>
An: TekScopes@...
CC:
Betreff: [TekScopes] Japnease Transistor

--
"Feel free" - 5 GB Mailbox, 50 FreeSMS/Monat ...
Jetzt GMX ProMail testen:

Hello all
are there any UK-based members out there with a Tek 2465?

As mentioned in a long post a couple of weeks ago I'm tryingto track
down a problem with mine. Currently my best bet is the Z-axis Hybrid
U950, p/n 155-0242-01. I will by a new one of those if need be, but
I'd like to be more sure of my diagnosis(*). If someone would be up
for trying my Hybrid in their 'scope and confirming that it is the
problem, I'd be very grateful. Postage etc. covered of course. Please
get in touch if you could help me with this.

Thanks
jon N

(*) I've checked the DC voltages on J119 which are all within limits
on a DMM, and the p-p ripple is fine on each voltage. The grid bias
adjustment alters the brightness fine, & it becomes apparent that the
front panel intensity control has *no* effect. The intensity control
does alter the output of the Display Sequencer Chip, but the waveform
#65 in the service manual (zBout from the hybrid) sits at around 3V
regardless of the position of the intensity control)

Heh.. cut teeth on a PDP-8 - we were first to use a "(mini)computer" to control the guide field of a large particle accelerator.
Here was this 'bitchin' lookin heavy/small Thing with smoked-plastic covers: blinking at you. In Octal.

The DEC "manual" was written for those who already knew what was in the manual. I had to start with a blackboard and Boolean Algebra book, on through RIM loader, wft-is-'assembly'?, wtf is an 'ALU', octal etc. I realized I'd never be (want to be) a programmer, but at least learned how-to: create a program to print out a BCD encoded paper tape on the ASR-33. Valuable lore.. from machine language through assy and compiling my source on the CDC-6600. And quite enough por moi, thankyouverymuch.

It's always useful to suffer through the basics.. then no snot-nose wannabe-someday 'IT'er can baffle you with BS.. 'explaining-away' some latest Redmond buffer overflow - built in by some bored committee of drones chained to a cubicle 10 years ago: and today -?- exposing you to the spoofer from Belgrade. Crapware has now infected the entire World. It will take a generation to undo what autistic/arrogant Billy has done to us all. For mere greed via mere hubris.

Still have a pristine Otrona??? CP/M portable w/ 5" green screen - operable last year I looked. Any takers?
(Word Star mnemonic codes inculcated into fingers.. still beats stupid-mousing distractions and M$ Word style eye candy -- for sheer speed of text entry -- for any touch typist. ^KS - saves your work, etc. You never forget, as their mnemonics made logical sense immediately - and your hands never left the home row.)

Fat chance of getting a 100 GB HD onto that CP/M OS, though :-/



Chuck Harris wrote:

Hello All
I am trying to source Some Japnese transistors or get some equivalent
info. ( 2SC2909)
Any help most welcome
M8JPK

im quite familiar with the lsi11 and q bus
never was a great fan of the data general nova machines.

They had nice features and some crocks. The 'increment memory location'
via DMA was useful for making multi-channel analyzers and photon
counting imagers. Their use of mostly standard parts was a real plus.
You could make good money by buying a minimally stuffed board and
loading it fully, once you knew how. The company management sucked, top
to bottom, with the sole exception of an ex-Tek sales engineer.

FWIW,
-John