Date   

543 Redux

David Armbruster <darmbrus@...>
 

Thanks to all who replied with advise regarding the old 543. I've had a couple of days to play with it now. I think I'm going to pass on it. But, the unit is in good shape and does appear to work in all respects. The CRT seems fine and the scope is generally stock (with original black beauty caps, UHF connectors, selenium caps and vinyl dust cover). He isn't asking much for it, so if anyone is interested, feel free to contact me off list for more information.

Thanks again,
Dave

-----
David Armbruster
Hardware Engineer
SEAKR Engineering


Re: Digital photos of scope screen

gettingalongwouldbenice
 

I use an Intel USB Webcam built into an old hood.
Works great for repetitive traces.
You can find the 640x480 versions at garage sales for less
than the cost of one pack of Polaroid film.

I did some experiments with triggering the camera.
Put an optocoupler across the "snap" switch on the camera.
Tried to trigger it from the gate out of the scope.

Actually works a small percentage of the time.
Seems that the button just sends a flag back to the driver
which snaps the picture whenever it gets around to it.
The intel driver lets you snap a bunch of pix in fast succession.
That helps with slowly repeating stuff. Statistically, you'll
get lucky eventually.

Sometimes capaturing the phosphor persistence is better than nothing.
mike

--- In TekScopes@yahoogroups.com, Morris Odell <morriso@v...> wrote:
Hi all,

-----Original Message-----
From: Philip Pemberton
Alternatively, would I be better off just going down to the local
computer store and buying a Fuji Finepix digital camera with
the money I was
going to spend on a scope camera?
I have tried photographing a 547 scope screen with a Nikon coolpix and have
had mixed results. Lessons I have learnt:

* Use a tripod and turn down the room lights
* keep the graticule illumination as dim as possible
* Switch off the camera autofocus
* With repetitive waveforms you may need to make several attempts depending
on the sweep speed
* With one-shot waveforms it's a matter of good luck to catch the trace -
digital cameras don't have the option to leave the shutter open, or at least
mine doesn't.

On the upside, you can see the result immediately and so know whether you
need to keep trying.

Good Luck,

Morris


465M Opt. H15

obbm_1939 <tlynne@linkny.com> <tlynne@...>
 

One of my 456Ms (S/N B036699) is marked "Opt. H15". Does anyone know
what this means? Thanks for any help.


Fw: (8) 16-position Tek ceramic strips on eBay

Stan & Patricia Griffiths <w7ni@...>
 

----- Original Message -----
From: "Stan & Patricia Griffiths" <w7ni@easystreet.com>
To: "Richard L. Hess" <lists@richardhess.com>
Sent: Sunday, January 12, 2003 4:57 PM
Subject: Re: [TekScopes] (8) 16-position Tek ceramic strips on eBay


Very interesting. It turns out that I have quite a large supply of
various
sizes of ceramics strips, new and salvaged, with original Tek mounting
chassis inserts, also of various sizes. I noticed the seller failed to
mention that special solder should be used on these . . . I am willing to
sell limited quantities of these strips and my price would be 10 cents per
notch, including the mounting inserts. The reason I have not made this
known before is that I intend to offer them on my web page at some point
in
the future after I do a complete description of the early and late ceramic
strips and describe each kind that was made and the various mounting
options. It is rather more complex than this seller would lead you to
believe . . . Still, if you know Tek ceramic strips and you know exactly
what you want, I can probably help you . . . if I don't get too flooded
with
requests . . .

Stan
w7ni@easystreet.com

----- Original Message -----
From: "Richard L. Hess" <lists@richardhess.com>
To: <TekScopes@yahoogroups.com>
Sent: Saturday, January 11, 2003 8:57 PM
Subject: [TekScopes] (8) 16-position Tek ceramic strips on eBay


http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&;item=1950783575

They look new and unused...thought someone refurb-ing a scope of that
vintage might be interested.

Cheers,

Richard


Re: 453 with an 8x10 Div display ???

Stan & Patricia Griffiths <w7ni@...>
 

Hi Rolynn,

I think all of the 453A series had the larger screen (8x10 as opposed to
6x10). This would include the 453A, 453A1, 453A2, 453A3, and 453A4.

Stan
w7ni@easystreet.com

----- Original Message -----
From: "Rolynn Prechtl K7DFW" <k7dfw@clatskanie.com>
To: <TekScopes@yahoogroups.com>
Sent: Sunday, January 12, 2003 4:21 PM
Subject: Re: [TekScopes] 453 with an 8x10 Div display ???


The 453 Mod 703H and Mod 703K as well as the 453A2 had the larger CRT.

Maybe more but those are the only ones I know of.

Rolynn TEK Bvtn '66-'71

..._._



Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/


Re: 453 with an 8x10 Div display ???

Stan & Patricia Griffiths <w7ni@...>
 

Yes, this is one of the many poorly documented "specials" Tektronix did for
specific customers. There was no mention of a manual with this instrument
and it will probably be impossible to find one if it is not included. It's
and odd-ball and I have never seen one like it and I have seen thousands of
Tek scopes. Approach with caution.

Stan
w7ni@easystreet.com

----- Original Message -----
From: "Richard L. Hess" <lists@richardhess.com>
To: <TekScopes@yahoogroups.com>
Sent: Sunday, January 12, 2003 3:19 PM
Subject: [TekScopes] 453 with an 8x10 Div display ???


I'm so confused...this is a Mod 703K 453
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&;item=3105661666
It has less stuff in the sweep area but is an 8x10 div CRT?

Thanks!

Richard




Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/


Re: (8) 16-position Tek ceramic strips on eBay

Stan & Patricia Griffiths <w7ni@...>
 

From: "Ashton Brown" <ashton@vom.com>

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&;item=1950783575

So then - think yer a Tekkie, eh? OK ....
ID the exact locale of that nicely photographed sample layout, in the ad
:-�
Wow, I couldn't pass up this challenge. Don't look below if you are still
working on it . . .





















3A1.

Stan
w7ni@easystreet.com


Re: 453 with an 8x10 Div display ???

ROLYNN PRECHTL K7DFW
 

The 453 Mod 703H and Mod 703K as well as the 453A2 had the larger CRT.

Maybe more but those are the only ones I know of.

Rolynn TEK Bvtn '66-'71

..._._


Help with Channel Crosstalk on 454

Stan & Patricia Griffiths <w7ni@...>
 

Hi Henry,

This is a guess only, but I would look for a leaky diode in the channel
switching circuitry.

Stan
w7ni@easystreet.com

----- Original Message -----
From: <odetomrcheese608@icqmail.com>
To: <TekScopes@yahoogroups.com>
Sent: Saturday, January 11, 2003 3:57 AM
Subject: [TekScopes] Help With Channel Crosstalk On 454 Please


Hello all,

I have been posting my progress on repairing a dead 454 and have come
quite far with it. All of the trace quality issues in my last post
were taken care of by simple CRT related adjustments. There is one
remaining issue and I'm STUCK without a clue.

There seems to be major interaction between the 2 channels, more so
in one mode than the other, chop vs. alt but I can't remember which
at the moment. When there is a signal on either channel it's clearly
visible on the other channel even though the other channel is loaded
or at ground. Another bit of information, moving the trace position
up and down will also cause the other channel trace position to move
as well, more in one mode than the other but both modes are affected.

At this point I'm not sure if this interaction is in the amplifiers
or in the ch1/ch2 diode switching circuit leading to the vertical
amp. Any help would be greatly appreciated as this project is
starting to eat a lot of time, which I don't have at the moment.

Thank you,
Henry


Re: [ForSale-Swap] FS: NUVISTORS 7895

Stan & Patricia Griffiths <w7ni@...>
 

I can tell you that both the 3B1 and 3B3 use the 7895 and it has the Tek
Part Number 154-0378-00. There may be other Tek instruments that use them
too, but I am not aware of them right now.

Stan
w7ni@easystreet.com

----- Original Message -----
From: "David Wise" <david_wise@phoenix.com>
To: "Phil T." <phil@vaxxine.com>; <TekScopes@yahoogroups.com>
Sent: Friday, January 10, 2003 9:02 AM
Subject: RE: [TekScopes] Fwd: [ForSale-Swap] FS: NUVISTORS 7895


I don't currently own anything that uses 7895s,
but I'm concerned that I might in the future.
Is there a short list of what instruments and
plugins use these?

BTW Phil, I don't know if it has settings for the
7895, but FWIW, the Hickok 6000 has a nuvistor socket.
The 600 (and probably 800) do not. Straight-line
and circular subminis yes, nuvistors no.

Regards,
Dave Wise

-----Original Message-----
From: Phil T. [mailto:phil@vaxxine.com]
Sent: Friday, January 10, 2003 6:21 AM
To: TekScopes@yahoogroups.com
Subject: [TekScopes] Fwd: [ForSale-Swap] FS: NUVISTORS 7895


fyi

Phil


Delivered-To: forsale-swap@mailman.qth.net


Hello to all...I have approximately 50 each 7895 RCA
Nuvistors for sale.
NOS. I have not found a tester yet, so they are sold as
untested at this
time. Of course I will stand behind them. All 50 for $250
delivered or
$7.00 each plus postage.

73 de N7IOK, Clyde n7iok@juno.com


453 with an 8x10 Div display ???

Richard L. Hess <lists@...>
 

I'm so confused...this is a Mod 703K 453
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&;item=3105661666
It has less stuff in the sweep area but is an 8x10 div CRT?

Thanks!

Richard


Re: Digitizing a scope

eric39392000 <eric39392000@yahoo.com> <eric39392000@...>
 

Thanks for the input, Craig! :) I've seen some of these "PC" scopes,
like Pico makes, on the web. My idea was similar; instead of using a
PC, the output would go into a regular scope. I'd like to "digitize"
an older scope, like a 453, and I was thinking that there might be
others out there who would love to use their old "analog" scopes,
except for their limitation of capturing one-shot events.
Having done some limited circuits involving opto-isolating a
scope signal, I readily agree with you on those bandwidth problems.
The best I could do was 1mhz bandwidth; mainly because my
optocoupler is too slow and my op amp's slew rate goes right down
the tubes when I try to increase the gain (I've got some new op-amps
and optocoupler I'm going to try when I have some more free-time).
All that I'm trying to achieve, if I build this circuit, would
be 10ms/s, which is what my 468 can do. My big problem, as I see it
right now, is to get the gain up after the D/A converter, so I can
have a decent signal for my scope to see. I think I can use FET's,
but I'm no engineer, so I'm hunting for schematics.


Re: Digitizing a scope

Craig Sawyers <c.sawyers@...>
 

I thought a neat product for Tektronix to make would be
a "digitizer". It would simple enough to do.
Already been done. The Pico ADC212-100 is the flagship with a bandwidth of
50MHz and 12 bit resolution. It is a little box that plugs into your PC
with a couple of BNC connectors for inputs and a third for trigger. There
is a 25pin D type to plug into your PC's parallel port, from which it
derives power.

It works as a 'scope, FFT spectrum analyser, and data logger. Costs around
?700 in the UK, so probably around $1200.

There are lower resolution and speed versions at lower prices, including
ones that are just a D connector with a BNC on it.

The reason you buy them rather than build is that it is darned difficult to
build an ADC that shows both the full resolution of the convertor (without
the bottom bits being buried in noise), and have fast settling time. They
are extremely twitchy to get right, and demand super-critical attention to
power supplies and PCB layout, often requiring 4 layers with buried power
and ground planes.

Craig


Digital photos of scope screen

Morris Odell <morriso@...>
 

Hi all,

-----Original Message-----
From: Philip Pemberton
Alternatively, would I be better off just going down to the local
computer store and buying a Fuji Finepix digital camera with
the money I was
going to spend on a scope camera?
I have tried photographing a 547 scope screen with a Nikon coolpix and have
had mixed results. Lessons I have learnt:

* Use a tripod and turn down the room lights
* keep the graticule illumination as dim as possible
* Switch off the camera autofocus
* With repetitive waveforms you may need to make several attempts depending
on the sweep speed
* With one-shot waveforms it's a matter of good luck to catch the trace -
digital cameras don't have the option to leave the shutter open, or at least
mine doesn't.

On the upside, you can see the result immediately and so know whether you
need to keep trying.

Good Luck,

Morris


Digitizing a scope

eric39392000 <eric39392000@yahoo.com> <eric39392000@...>
 

I thought a neat product for Tektronix to make would be
a "digitizer". It would simple enough to do. One's scope probe would
connect to a BNC, to a volts/div knob and attenuator. The signal
would then go thru an A/D D/A converter and then thru BNC cables to
one's scope. The digitizer would have two comparitors (one for +
trigger and the other for - trigger) with a pot setting the
comparitors' trip level. Have the outputs of the comparitors going
into an OR gate, a latch, then to the A/D D/A "active" input. This
would allow for a "single aquisition" function for the digitizer
(which is about all a digital scope is good for). Put a reset on the
latch and the circuit is finished! This circuit would make ANY
analog scope into a digital scope! With a selector switch, one could
choose whether to run the signal straight into the scope for analog
function, or go thru the digitizer. What do you think?


Re: (8) 16-position Tek ceramic strips on eBay

Ashton Brown <ashton@...>
 

Craig Sawyers wrote:

They look new and unused...thought someone refurb-ing a scope of that
vintage might be interested.
I bought a couple of lots of these from the guy a few months back for a
tubed amp I'm building for electrostatic headphones - and yes, they are new
unused. However, they are the smaller sized strips, with less distance
between the notches, that Tek used in the early transistorised gear. So
they are not a direct replacement for the strips in tubed gear - they are
smaller.

He seems to have a gadzillion of them - he's been selling them for at least
four months, and always has at least one lot on ebay at any particular time.

Craig
I believe I have a few new assorted ceramic strips + mount pieces, probably some like these, but also the larger 'coarser pitch' for vac. tubes. Believe the latter would have been P/Ns from the 503 manual (!), and all part of a small Tek order at the time. So if anyone is hurting for a specific size -- it's about 80/20 I know where the box is. Best use them for a restoration, I guess - though I ordered them for a project. Heh...
(There were several of the posts in a bag, too - more than were needed for the strips)

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&;item=1950783575

So then - think yer a Tekkie, eh? OK ....
ID the exact locale of that nicely photographed sample layout, in the ad :-�
(6DJ8 you say? Gosh, now Where have I seen That used ..? ;-)
(And wasn't the originally 'Military' gold-pin 6922 a 'hot' replacement for the 6DJ8, higher Gm and more resistant to cathode-interface dread disease?)
Winner gets a couple of the ceramic strips IF I really can find them -

I miss tubes - esp. the warm glow from a pair of Marantz Model 9s with the cage off - sorta candlelight to go with Glenn Gould, the Goldberg Variations at 2 am; Model 10B tuner set to show "bucket of worms" X-Y display of stereo separation ... or the Mystical Flashes! of a 5C22 Thyratron with a 20 KV pulse across it.. OK enough.


Ashton


Re: (8) 16-position Tek ceramic strips on eBay

Craig Sawyers <c.sawyers@...>
 

They look new and unused...thought someone refurb-ing a scope of that
vintage might be interested.
I bought a couple of lots of these from the guy a few months back for a
tubed amp I'm building for electrostatic headphones - and yes, they are new
unused. However, they are the smaller sized strips, with less distance
between the notches, that Tek used in the early transistorised gear. So
they are not a direct replacement for the strips in tubed gear - they are
smaller.

He seems to have a gadzillion of them - he's been selling them for at least
four months, and always has at least one lot on ebay at any particular time.

Craig


503 questions

Stan & Patricia Griffiths <w7ni@...>
 

Well, it turns out the 503 was discontinued in 1971. I think it came out in
about 1959 because it was in production in Plant 2 in June of 1960 when I
started there. At the time, it was the lowest priced scope Tek made (other
than the 504) and it was used a lot in junior college electronics labs. It
made a pretty good lab scope for students but didn't really have enough
bandwidth for the average design engineer.

Stan
w7ni@easystreet.com

----- Original Message -----
From: "Richard L. Hess" <lists@richardhess.com>
To: <TekScopes@yahoogroups.com>
Sent: Friday, January 10, 2003 11:48 PM
Subject: [TekScopes] Tek 503 - questions


I'm intrigued by the 503 as I used it in my first summer job in 1971.

I have a Word document by Roger Ensrud from the Tek Web site saying that
it
came out in 1971. I'm not sure I believe that. It looked "old tech" then
with its UHF connectors--the 453 which dates to 1966 had BNC connectors. I
doubt we would have had several of them if they had been released in 1971
when I joined in June of 1971. It just doesn't feel right.

Also, why design an all-tube scope in 1971 when the 453 was mostly
transistor in 1966.

The X-Y parity, the 1mV/div differential inputs and only 450kHz bandwidth
make me wonder what it was made for, if not audio.

The downside is that it won't show any oscillations, as the major
manufacturer I worked for in 1971 had learned about the hard way--burying
a
run of consumer amps/receivers in the factory's front yard!

Anyway, any insights on the history would be appreciated. I'm not sure I
want to buy one--not at least until I get the storage on my 466 working
better.

I also checked, and the phase response of my 465M and 485 in X/Y mode is
within degree or so way past the audio range, so I don't need it for
X/Y...and I can probably conjur up a 5X (14dB) gain differential amp
without too much trouble if I need the increased sensitivity and
differential inputs. In fact, there is already a great differential preamp
in my Amber 3501 Audio Test Set.

Oh, and for working on tube circuits--if I don't have a 503, I won't have
to work on them (Haha, actually I have a pair of Ampex 2012 speaker amps
and a WWII aircraft receiver set up for broadcast band), I have a 100x
probe and a 1000x probe coming (without fluid).

So, I think I talked myself out of the 503 <smile>, but I'm curious about
the history, and the "why" it was built.

Cheers,

Richard


(8) 16-position Tek ceramic strips on eBay

Richard L. Hess <lists@...>
 

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&;item=1950783575

They look new and unused...thought someone refurb-ing a scope of that vintage might be interested.

Cheers,

Richard


422

wmman47 <poorboy47@msn.com>
 

HI ALL,
Need to ask a question. On a 422 if you put it in the FREE RUN
position should you ge a TRACE even if you had trouble in the
trigger circuit and getting no trigger signal to sweep generator?
Thanks
Dennis

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