Date   

Tek 7934 info

croatia7104 <hteurep@hteurep.hr> <hteurep@...>
 

Hi guys,

is there anybody experienced with TEK 7934? Is its storage screen
more sensitive than ordinary P39 phosphor (i.e. is it more difficult
to find good screen?). If I decide to buy such instrument, is there
something that I should be specialy carefull about? Which serial
numbers to look for?

Thanks for help.

Best regards,
Josip, Croatia


Re: Software package TEKTRONIX PROFILE PDR 100 or PDR 200 SOFTWARE

Richard L. Hess <lists@...>
 

A little bit of related history:

Both Tektronix and Hewlett Packard got into making video servers early on. Philips had something called a "Media Pool." HP had "MediaStream." Tek had "ProFile."

BTS/Philips killed Media Pool before the sale to Thomson. Thomson now has the Tek/GVG ProFile.

The HP Mediastream is now owned by Pinnacle. I wonder if I'll be getting a Pinnacle "movie" card in my new Dell????

Cheers,

Richard


Re: Software package TEKTRONIX PROFILE PDR 100 or PDR 200 SOFTWARE

Richard L. Hess <lists@...>
 

At 08:15 AM 2/21/2003 +0000, Denis Cobley wrote:

The product is now part of Grass Valley Group a Tek spinoff.
Just to clarify:

The Grass Valley Group existed as an independent company for many years. I was first exposed to their products--and visited their factory--in 1974. The company, I believe, was originally founded by Doc Herr. I don't have an exact founding date.

GVG was purchased many years later by Tektronix. I would guess in the mid-late 1980s.

Tektronix, as I understand it, sold it back to the employees in the very late 1990s.

It has now for the past two or so years, been part of the Thomson group.

At least this is how I understand it.

While I'm a real fan of Tektronix, I'm afraid crediting them with founding GVG is not possible. In fact, I'm not even sure that their ownership was really good for GVG, long term.

The Profile, itself WAS a Tektronix product IIRC, and it was sold with the GVG line where it fit. GVG makes video switchers (both production and routing) and terminal gear (converters, distribution amplifiers, etc.) as well as the Profile. They also provide some editing software.

Cheers,

Richard


Re: Software package TEKTRONIX PROFILE PDR 100 or PDR 200 SOFTWARE

Richard L. Hess <lists@...>
 

The PDR series are the video servers which are Tek/Grass Valley products called ProFiles.

The software would be rather useless without the specialized box.
http://www.thomsongrassvalley.com/products/servers/family_pdr/

Yes, Grass Valley Group is now part of Thomson!!!! As is the old Philips Broadcast.

There is a ProFile XP which is a newer product.

Cheers,

Richard


Software package TEKTRONIX PROFILE PDR 100 or PDR 200 SOFTWARE

Miroslav Pokorni
 

Does anyone know what 'TEKTRONIX PROFILE PDR 100 or PDR 200 SOFTWARE' is and
what does it do. It has been offered on e bay number of times, looks like
guy is growing it in his backyard. One of current auctions is item #
3402571828. The software is on a CD, what indicates newer issue. There is a
picture of manual, open to page of content, but I am not able to read it.

Would someone, please, help.

Regards

Miroslav Pokorni


Re: 12th power is correct on bulb life

Miroslav Pokorni
 

The power of three is close to light output re-rating, the actual number is
3.5. As for lifetime re-rating I did not see any restriction on the ratio of
voltages. Bear in mind that those numbers are approximate, you certainly
could not measure elapsed time by that method.

Mouser is pretty much a low life cataloger, parroting other sources and
frequently those copies are not checked for accurate re-typing. I consider a
bulb manufacturer much more trustworthy source of such information, because
it is their livelihood that is on the line, though some of them have slid
down the line of quality. For example, GE bulbs of any kind are no better
than third word products; for that matter, they are made in a third word
country, Brazil. I certainly would not trust data offered by GE's lamp
division. One reputable manufacturer is Chicago Miniature, they have been
around for long time and have good reputation for quality. There is a very
good application note in their data book; web site is: http://www.chml.com/

Regards

Miroslav Pokorni

----- Original Message -----
From: <arthurok_2000@yahoo.com>
To: <TekScopes@yahoogroups.com>
Sent: Wednesday, February 19, 2003 5:54 PM
Subject: [TekScopes] 12th power is correct on bulb life


pardon me ; the intensity delta change is about the cube root
"exp-3.3" radio shack was selling little grain of wheat
bulbs im not sure if they still do that are used in cheap
consumer grade stuff im not sure that the -12th power
formula is correct for a 2.4 voltage ratio change
but i did err in thinking it was a cube root of ratio
change in life expectancy try this source also www.mouser.com



Re: tek 1501, 1502 and 1503 TDR's

Miroslav Pokorni
 

Well, that is novel approach to collecting. Most of us buy hardware and then
look for manual and you put that thing upside down.

Regards

Miroslav Pokorni

----- Original Message -----
From: <macgregor@chestnuttech.com>
To: <TekScopes@yahoogroups.com>
Sent: Wednesday, February 19, 2003 5:46 PM
Subject: [TekScopes] tek 1501, 1502 and 1503 TDR's


hello all,

i picked up a set of manuals on ebay recently that pertained to the 1503
and 1501, which i kind of expected to be like the 1502.

turns out that the 1501 is one of a few instruments tek made that used a
separate X-Y scope as a display device, and it is like the 1401 spectrum
analyzer in that regard. it is sized approximately for the 323 scope and
even has an accessory that bolts the two together as a battery powered
portable TDR system. i guess it went out of fashion in the 1970's, and i am
betting that it did not sell in large quantities.

just wondering if anyone in the group knows the box, and has ever seen one
for sale anywhere. it is totally cool. has step and half-sine pulses and
multiple output impedances. neat thing is that it would be useful with a
modern digitizing scope for documentation, too. and even though none of
the old tek TDRs used hybrids, this thing is completely capable for being
user maintained.

anyway, as i said...wondering about general availability and/or value of
such an item... any reports of sightings of one would be greatly
appreciated.

forrest macgregor




12th power is correct on bulb life

arthurok_2000 <arthurok_2000@yahoo.com> <arthurok_2000@...>
 

pardon me ; the intensity delta change is about the cube root
"exp-3.3" radio shack was selling little grain of wheat
bulbs im not sure if they still do that are used in cheap
consumer grade stuff im not sure that the -12th power
formula is correct for a 2.4 voltage ratio change
but i did err in thinking it was a cube root of ratio
change in life expectancy try this source also www.mouser.com


tek 1501, 1502 and 1503 TDR's

macgregor54 <macgregor@chestnuttech.com> <macgregor@...>
 

hello all,

i picked up a set of manuals on ebay recently that pertained to the 1503 and 1501, which i kind of expected to be like the 1502.

turns out that the 1501 is one of a few instruments tek made that used a separate X-Y scope as a display device, and it is like the 1401 spectrum analyzer in that regard. it is sized approximately for the 323 scope and even has an accessory that bolts the two together as a battery powered portable TDR system. i guess it went out of fashion in the 1970's, and i am betting that it did not sell in large quantities.

just wondering if anyone in the group knows the box, and has ever seen one for sale anywhere. it is totally cool. has step and half-sine pulses and multiple output impedances. neat thing is that it would be useful with a modern digitizing scope for documentation, too. and even though none of the old tek TDRs used hybrids, this thing is completely capable for being user maintained.

anyway, as i said...wondering about general availability and/or value of such an item... any reports of sightings of one would be greatly appreciated.

forrest macgregor


Re: subminiture light bulbs

Miroslav Pokorni
 

The empirical data for tungsten light bulbs show that life is extended by a
number equal to 12th power of rated to applied voltage ratio, what in case
of 12 V rated lamp run at 5 V would be around 36 000 times. Considering that
flash light bulbs are run for high light output and a life of just few
hours, the ratio is smaller than 36 000, but still quite large.

Regards

Miroslav Pokorni

----- Original Message -----
From: <arthurok_2000@yahoo.com>
To: <TekScopes@yahoogroups.com>
Sent: Wednesday, February 19, 2003 12:23 PM
Subject: [TekScopes] subminiture light bulbs


radio shack might still sell some wire lead bulbs that
might work.
Using a 12vlt bulb running at 5 vlts should last a long time
"most consumer electronics bulbs arent rated for 50000 hours
life running a 12 vlt radioshack special at 5 vlts will
probably increase its life 10 fold



Re: Tek 465 repair hints, svc manual? (fix story)

Richard L. Hess <lists@...>
 

Ok, off-topic, but fun.

Test fixture with seven cards fresh out of card-stuffing/wave solder.

Owner of firm brings the bankers by and explains my "cool" automated test setup.

I'm on a deadline, so I start testing the new cards.

Power up the test frame, smoke all over the place! All seven cards had both rails' tantalums in backwards.

Owner and bankers exit very promptly.

I take the boards, still smoking, back to the module fabrication group. The boards were not the only source of smoke. I think some was coming out of my ears.

Cheers,

Richard


Re: Need Transistor for 465M

Miroslav Pokorni
 

I will start you on that, Craig, though. But do not feel bad, the issue is
equally confusing to Motorola employees, too. Some years ago, right around
time when that 'shrewd' business move of spin-offs was perpetrated by
everyone and his dog in electronic industry, I was at a seminar with few
people from Motorola. I was searching for a PLL part and a lady from the
group worked for Frequency Control department. She could not tell whether a
particular part was handed over to ON or retained by Motorola. We ended up
by having the lady check and call me when she got back to her office.

There were similar things with Infinion, but did not impact me too much,
because DRAM was the only Siemens' product that I was involved with. And,
similarly, employees were in dark at Siemens, too. I was seating on JEDEC's
DRAM committee and talked with Siemens' guy. He did not have any idea which
part of former Siemens semiconductor division was transferred to the
Inifinion and which one was sold out or shut down.

Regards

Miroslav Pokorni

----- Original Message -----
From: "Craig Sawyers" <c.sawyers@tech-enterprise.com>
To: "TekScopes" <TekScopes@yahoogroups.com>
Sent: Wednesday, February 19, 2003 1:06 PM
Subject: RE: [TekScopes] Need Transistor for 465M


The generic name for a 151-0426-02 is D44H11
Current part from ONSemi (56c each) (Motorola as was, before confusing
name
change. Don't start me on that beef!)

Craig


Re: Tek 465 repair hints, svc manual? (fix story)

Miroslav Pokorni
 

Electrolytics can make a spectacular and quite dangerous 'exit from the
scene'. Personally, I have seen number of tantalums which failed and not
every time the cap was mounted wrong way. Frequently, there is not enough
pieces left to reconstruct polarity, but often enough tantalum slug remains
in place to verify that cause was nastiness of tantalum rather than backward
mounting.

I have also seen a PC motherboard that caught on fire. Company that I worked
for at the time, was making SIMMs and the particular one had only ceramic
caps, all surface mounted components. The cap shorted, most likely one of
those micro-cracks due to high rate of heating the cap. The subsequent
washing supplied moisture, which was never dried out properly. The product
seating on the shelf for months permitted enough silver migration to build
up to a solid short and when module was plugged in, the short heated up FR4
to point of fire, what transferred to connector body and eventually to
motherboard. Company had to buy new motherboard for customer.

However, the most dangerous electrolytic failure that I heard about was a 16
V 'computer grade' (2" diameter X 3" length), wired backwards and facing
front end of bench. That happened at my first employer, few weeks before I
started work with them. The slug, aluminum foil winding with electrolyte,
flew between heads of two guys who were testing prototype and hit the wall
on the other side of lab. I was shown the 'point of impact', there was a
dent �" deep and that was mortar covered brick wall.

Regards

Miroslav Pokorni

----- Original Message -----
From: "Craig Sawyers" <c.sawyers@tech-enterprise.com>
To: <TekScopes@yahoogroups.com>
Sent: Wednesday, February 19, 2003 12:42 PM
Subject: RE: [TekScopes] Re: Re: Tek 465 repair hints, svc manual? (fix
story)


Never
anything really exciting from a capacitor, however, most of the
unfortunate electrolytic experiences were much more sedate than
usually described.
Well, I had an electrolytic blow up in my face once. The pressure relief
was facing me, and POW! Fortunately I wear spectacles, and that stopped
the
goo going in my eyes. I can't quite remember exactly what abuse that
capacitor had had - I suspect that I was expecting more of it than it was
prepared to give (probably exceeding ripple current rating by an order of
magnitude or some such in a quick-and-dirty lash up).

Craig


Re: Need Transistor for 465M

Craig Sawyers <c.sawyers@...>
 

The generic name for a 151-0426-02 is D44H11
Current part from ONSemi (56c each) (Motorola as was, before confusing name
change. Don't start me on that beef!)

Craig


Re: Tek 465 repair hints, svc manual? (fix story)

Craig Sawyers <c.sawyers@...>
 

Never
anything really exciting from a capacitor, however, most of the
unfortunate electrolytic experiences were much more sedate than
usually described.
Well, I had an electrolytic blow up in my face once. The pressure relief
was facing me, and POW! Fortunately I wear spectacles, and that stopped the
goo going in my eyes. I can't quite remember exactly what abuse that
capacitor had had - I suspect that I was expecting more of it than it was
prepared to give (probably exceeding ripple current rating by an order of
magnitude or some such in a quick-and-dirty lash up).

Craig


subminiture light bulbs

arthurok_2000 <arthurok_2000@yahoo.com> <arthurok_2000@...>
 

radio shack might still sell some wire lead bulbs that
might work.
Using a 12vlt bulb running at 5 vlts should last a long time
"most consumer electronics bulbs arent rated for 50000 hours
life running a 12 vlt radioshack special at 5 vlts will
probably increase its life 10 fold


Re: Tek 465 repair hints, svc manual? (fix story)

E K
 

50 volt disc. Where did my signal go? Took the cap out and measures 4
ohms. No stress there but the cap failed. So it dont suprise me
The interesting thing is that this cap wasn't really "shorted". Part of what threw me off for a while during this whole process is that the 110V supply is really low-current compared to what I'm used to, so a tens of milliamps count.

As for ceramics, a physical crack opens all sorts of ways to build up a
short, primarily through whisker growth (metal used for plates is the
culprit). And again, if there is not enough energy in circuit to clear
Fascinating, the bit about whisker-growth.

Personally, I have never had a good visual show. Had some stinkers
The 465's cap didn't have enough to be noticeable. However, I have seen some really exciting things -- like balls of white fire from exploding IGBT's powered by a few amps at 300 VDC. Never anything really exciting from a capacitor, however, most of the unfortunate electrolytic experiences were much more sedate than usually described.









---------------------------------
Do you Yahoo!?
Yahoo! Shopping - Send Flowers for Valentine's Day


Re: Inendiary discs, was Tek 465 repair hints, svc manual? (fix story)

Miroslav Pokorni
 

I am curious how much of real visual effects (smoke and flames) did you get
out of that cap. I do not doubt that there was enough energy in the circuit
but a ceramic disc does not provide much of combustible material.

Personally, I have never had a good visual show. Had some stinkers (magnet
wire seems to produce long lasting stink), had power transistors (TO-220)
that exploded, but not much smoke and never any flames.

The first place where I worked when I got out of school was a former
government lab. People had lot of time at hand and a favorite stunt played
on rookies was to take a housing of an electrolytic and put in a piece of
resistive wire and a small spool of photographic film (in those days film
was still celluloid, a euphemism for nitrocellulose, an explosive actually),
put that contraption over a voltage in a Tektronix scope and have rookie do
something that required scope. Few minutes after power on, there would be a
burst of flame and smoke. Poor guy would quickly snap power switch off and
start warring how to fix damage. And that is when fun started: some guys
would offer to arrange for an installment payment for scope (what would take
10 years with price of scope in early 60s and low salaries in Yugoslavia),
some others would offer to find a guy who can fix the scope (at an
exorbitant price) and game was played until end of day.

Fortunately for me, by time I was hired, the enterprise became commercial
and people had to do some work rather than play pranks, but I heard stories
and 'victims' were pointed, some of them were in management by that time.

Regards

Miroslav Pokorni

----- Original Message -----
From: "Craig Sawyers" <c.sawyers@tech-enterprise.com>
To: <TekScopes@yahoogroups.com>
Sent: Tuesday, February 18, 2003 1:58 AM
Subject: [TekScopes] Inendiary discs, was Tek 465 repair hints, svc manual?
(fix story)


Like a 3 volt p-p signal riding on 6 volts of DC
with a .01
50 volt disc. Where did my signal go? Took the cap out and measures 4
ohms. No stress there but the cap failed. So it dont suprise me
either,
but its not the first thing I go looking for either.
One evening, listening to the Television sound through a stereo amp (50W)
and speakers the amp died - smoke and flames. Took the lid off, and all
that had happened was a 0.1uF disc ceramic decoupler had gone short and
crowbarred the power supply. There was enough energy in the smoothing
caps
to incinerate it after the fuse had blown (around 20J).

Craig


Re: More digitizing stuff

Miroslav Pokorni
 

You are talking about 50 Msps? That puts your memory cycle to 20 ns, a
pretty tough requirement. Try Cray's gig with memory: butterfly it. Use
registers to store odd samples and on even samples write new sample and odd
one from register into double wide memory; you can extend this scheme to a
four wide memory, if your A/D can hack it. You can also use two A/D with
appropriate sample/holds to butterfly conversion.

Regards

Miroslav Pokorni

----- Original Message -----
From: <eric39392000@yahoo.com>
To: <TekScopes@yahoogroups.com>
Sent: Tuesday, February 18, 2003 4:39 PM
Subject: [TekScopes] More digitizing stuff


Well; I bought a HP 5180A on ebay, and I await it's arrival. It will
(I hope) acomplish what I had wanted: digitize an analog scope so
that I will have digital one-shot capabilty. On the down-side, the
HP5180A is the size of a small compact car, so I'm not sure where
I'm going to put it on my bench if it turns out to actually work.
I'm still working on MY version of a digitizer. I was trying to be
much too complicated with it, after discovering an obvious flaw in
my orginal design. I had first invisioned an A/D D/A , with a latch
in between until I realized that this layout would aquire only ONE
point on my signal display! DUH! No WONDER those DSO's require
memory! Then I went into microcontrollers to read and write the data
which would be my 250 or so samples but came to discover that my
thru-put would be much too slow for any decent signal frequency.
Then I went to a quickly-abandoned idea of using the output of my
THS720 (which goes to a printer to print a stored waveform) into my
analog scope, until Tektronix informed me that the ouput was in the
wrong form for putting into a D/A. Now I'm to a design that I should
have seen sooner: Just use RAM instead of getting overly complicated
with microcontrollers. I have an up-counter (good for 100Mhz)
counting addresses to my RAM, with the same clk used for my A/D. My
counter goes into some NAND gates which, after my count gets high
enough (500 samples), it turns off my read line, resets my counter
and starts writing to my D/A. This is a simple explaination; I have
some latches and buffers in there too. I hope to get 50MPS out of
this contraption if it works! :) The only problem is getting the
spare time at work to work on it! :)


Re: 7904 Switch Lamps

Miroslav Pokorni
 

From what I remember reading about those 'aged and selected' bulbs that
Tektronix used, they were selected for light output. I do not think that
those long life (50 000 hours) light bulbs are risk, even used, as far as
their life is concerned, because they are grossly underrated. There is
probably a risk of damaging a bulb in the process of removal, since lot of
them are with wire leads, instead of sockets.

Regards

Miroslav Pokorni

----- Original Message -----
From: "Stan & Patricia Griffiths" <w7ni@easystreet.com>
To: "Jay Mandel" <jmandel@nyc.rr.com>
Cc: "TekScopes" <TekScopes@yahoogroups.com>
Sent: Tuesday, February 18, 2003 11:05 AM
Subject: [TekScopes] Re: 7904 Switch Lamps


Hi Jay,

I don't happen to have any bulbs for the "A" and "B" positions of the 7904
mainframe horizontal mode switch.

I did come up with the following info in my search, however:

Horizontal mode switch = 670-1639-00

A and B bulbs = 150-0057-01
These are 7153AS15 "selected". The manual for 7904's above s/n B26 gives
a generic number of 17AS15 for these bulbs. Both numbers are rated at 5
Volts and 115 mA.

These bulbs are aged and "selected" but there was no explanation of what
they are selected for. My guess is that they are matched for light output.

The manufacturer is:

Oshino Electric Lamp Works, Ltd.
52 Minami Shinagawa 2 Chore
Shinagawa ku,
Tokyo, Japan

I would do a Google search on the manufacturer to see if there is a dealer
in the U.S. who will sell small quantities of these. They were used in a
LOT of Tek instruments and your best bet may be to pull some out of a
salvaged instrument. I know it is not the best idea to use used
incandescent bulbs, but these are specified to have a life of 50,000 hours
and I suspect the ones in the "A Dlyd" and "B Int" positions do not have
many hours on them . . .

If you find a good source for these, let us all know . . .

Stan
w7ni@easystreet.com

----- Original Message -----
From: Jay Mandel
To: w7ni@easystreet.com
Sent: Monday, January 27, 2003 10:06 AM


Hi. Do you have "grain of wheat" bulbs for 7904 Mainframe "A" & "B"
indicators?

If so, what would shipping be to 10023?

If not, any idea of a source?



Thanks





Jay Mandel




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