Date   

'Triple-decker' 7104?

uclpanda <t.phillips@...>
 

Hi;
Browsing ebay, looking at cover of Tek catalog 1974,
what appears to be a 7104(?) with a 'second storey'
between the CRT unit and the plug-in frame.
Could anyone enlighten me as to what it was, please?
I may have the exact 7xxx model wrong!
many thanks.
Tim.


Looking for Tek Appnotes

uclpanda <t.phillips@...>
 

Hi;
I am trying to get hold of the following (old)
Application Notes for the 5000-series scopes:
AX-4462 Biophysical data retrieval.
AX-3746 Recording nerve activity.
referred to in a Tek catalog 1984.(P286)
Also a copy of Strong's book on Biophysical
Measurements. Any pointers gratefully recieved.
I found nothing on ebay so far.
many thanks.


Re: RM503 - The story continues.

Denton, Adam (Exchange)
 

Aaah, you are in the same boat as i was. My 564B's 3.3kV supply
was leaking to ground thru the CRT filament supply also.
On the 564 the filly is driven from the (giant) main power
transformer so replacing the whole thing seemed dubious.

To make a long story short, I unwound the secondary of an
(ancient) radio shack 6.3V transformer, carefully put 2
layers of electrical tape on it and everywhere, and re-wound
it. Worked. *but* in 2 weeks guess what, broke down.
I think it is the plastic part where the leads go.
I repeated the operation but this time it broke down in a day,
again confirming it's the plastic part, not the tape.
The tape I verified by just seeing if the unloaded supply
would arc thru it. It didn't.

So I'm planning another rewind, but i am in need of a core
where the sec is totally isolated from the primary -- i
have a few 'formers like that but they are big 2A types
and i'd rather not waste them. The problem is, it's a
major hassle to re-wind a 'former because getting the E's
and I's apart is a MAJOR headache! The actual rewinding
operation only took about 2 hours including taping,
but disassembling the 'former the 1st time is a dangerous
and un-fun operation. That resin-like stuff that glues
the former is very tough, and you can't use the obvious
(propane torch) since that would melt the plastic form.
Came down to a sharp chisel and tapping with a hammer,
one layer at a time.

But it can be done. Leave NO part of the secondary
uncovered with tape, and there must be no gaps in the
tape either.

Another option would be to heist the core of an old
TV flyback (or vertical pincushion).
These cores are easy to take apart, trivial to wind
(no plastic needed). The problem is they're useless
at 50/60 Hz so you have to build a driver to power
them at e.g. 1-10kHz.

Another option is to junk the scope. I am considering
that option too :-( [it is only 10 MHz]

(funny, out the 1,000 resistors/caps/diodes/transisitors/tubes
in the beast, maybe there are only 2 or 3 components
that are impossible or prohibitively expensive to replace.
(CRT, main power 'former, and HV 'former. No hybrids!)
SO, Murphy's law applies and thus it one of the 2 or 3
dilly-parts that breaks! Figures!!)

----
2) Rewind the 6.3v winding on the transformer. It appears to be outside
winding on the device, so it should not be that hard.
3) Install a separate 6.3v transformer to supply the CRT heater voltage.


***********************************************************************
Bear Stearns is not responsible for any recommendation, solicitation,
offer or agreement or any information about any transaction, customer
account or account activity contained in this communication.
***********************************************************************


Re: p6032 Probe

Craig Sawyers <c.sawyers@...>
 

This is a cathode follower probe, intended for the 1S1 sampling plug-in. It
is good from DC to 850MHz, but goes beyond that. Depending on attenuator
head, it has a loading of 1.3pF (1000x) to 3.6pF (10x) in parallel with
10M. Load resistance at the GR connector is 50 ohms.

Look upon it as a big FET probe, and you will not be far wrong.

The power connector interfaces with a socket on the front of the 1S1, and
needs the following voltages:

A - ground
B, C - 12.6V at 180mA
D - +100V

These probes give a very clean response - I'll send you a picture of what
they are capable of.

Craig

-----Original Message-----
From: penguin2001au [mailto:j.foster@mmb.usyd.edu.au]
Sent: 17 September 2003 01:55
To: TekScopes@yahoogroups.com
Subject: [TekScopes] p6032 Probe


Hi:

Does anybody have any infomation on this probe?
It is a cathode follower type and has a GR connector for the signal
and a small four pin plug for power.
It does not appear on the reprise.com list.

Regards: John F.





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


Re: p6032 Probe

Robert Morein <morepub@...>
 

I had a pair I sold to charlesmorris@direcway.com.

The probe was specified for the 1GHz 661 sampling scope.
Charles has the instruction manual.

----- Original Message -----
From: penguin2001au
To: TekScopes@yahoogroups.com
Sent: Tuesday, September 16, 2003 8:54 PM
Subject: [TekScopes] p6032 Probe


Hi:

Does anybody have any infomation on this probe?
It is a cathode follower type and has a GR connector for the signal
and a small four pin plug for power.
It does not appear on the reprise.com list.

Regards: John F.


Yahoo! Groups Sponsor
ADVERTISEMENT




Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.


p6032 Probe

penguin2001au <j.foster@...>
 

Hi:

Does anybody have any infomation on this probe?
It is a cathode follower type and has a GR connector for the signal
and a small four pin plug for power.
It does not appear on the reprise.com list.

Regards: John F.


RM503 - The story continues.

doug_jackson@...
 

Hi,

Thanks for the advice regarding caps. I have checked them, and they
appear to be operational.

I spent some more time working on the PSU last night. Finally, I lifted
the 3kv rectifier (5642) and the supplies came up beautifully!

Further investigation revealed 6k ohm of leakage between the 190V (pin
9,8) and the 6v (CRT heater pin 6,7) windings of the primary transformer
T601.

I have cleaned the area with ethyl alcohol, in case the leakage was caused
by surface oils, but it is still there.

The way I see it, I have a couple of possible solutions;

1) Obtain a replacement transformer. (Tec part # 120-203) - this
component is probably made from unobtanium.
2) Rewind the 6.3v winding on the transformer. It appears to be outside
winding on the device, so it should not be that hard.
3) Install a separate 6.3v transformer to supply the CRT heater voltage.

Can anybody provide any extra information on the rewinding options? I
*really* dont want to install a separate transformer if I can help it.

Alternately, does anybody on the list have a transformer that they would
be willing to part with, or could name a supplier that would be able to
supply one (for less than the cost of my mortgage!)

regards.

Doug Jackson
National Manager - Managed Services (ACT)
Citadel Securix Pty Ltd

Level 1, 10 Moore St
Canberra ACT 2601
Ph: (612) 6290 9011
Fx: (612) 6262 6152
Mob: 0414 986 878

Web: www.citadel.com.au
Melbourne - Sydney - Canberra - Brisbane - Hong Kong - Atlanta

Any pricing or time figures contained within this email are indicative
only, and have been provided for planning purposes only. Please request a
quotation from your sales representative prior to undertaking any work.



CAUTION - The information in this message may be of a privileged or confidential nature intended only for the use of the addressee or someone authorised to receive the addressee's e-mail. If you are not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this e-mail is strictly prohibited. If you have received this email in error please notify postmaster@citadel.com.au. Any views expressed in this message are those of the individual
sender and may not necessarily reflect the views of Citadel Securix.
Feel free to visit the Citadel Securix website! Click below.
http://www.citadel.com.au


Re: Tek 310: 10Ω dropping resistors for diode bridges

stan mcintosh <mcintosh@...>
 

Ooops! After this message, I looked more closely at the schematic. I thought I was reading a 7V drop across the dropping resistor for the -150V line. The decimal point was not that obvious... until I looked for it.

Thanks.

stan

----- Original Message -----
From: Carl E. Davidson
To: TekScopes@yahoogroups.com
Sent: Tuesday, September 16, 2003 11:20 AM
Subject: [TekScopes] Re: Tek 310: 10Ω dropping resistors for diode bridges


10 ohm 1 Watt resistors are all that's needed here (this is what
Tektronix used in the later model 310A that had silicon diode
rectifiers). The purpose of these resistors is to limit the
surge current through the rectifier diodes when power is first
applied (when the filter capacitors essentially represent a
short circuit for the first few milliseconds).

Carl


--- In TekScopes@yahoogroups.com, "stan mcintosh" <mcintosh@t...> wrote:
> Several people have emphasized that I need to be sure to include
10Ω dropping resistors for the silicon diode bridges that are
replacing the selenium bridges.
>
> Question: what wattage? Seems like 10W will be good for the -150
line, but I don't have more than one 10Ω/10W resistor in le boxe du
junque. Is 10W overkill for the other two bridges? If not, I can go
by and see if Radio Shack still carries them.
>
> stan
>
> [Non-text portions of this message have been removed]


Yahoo! Groups Sponsor
ADVERTISEMENT




Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.


Re: Tek 310: 10Ω dropping resistors for diode bridges

Carl E. Davidson <carlhpretired@...>
 

10 ohm 1 Watt resistors are all that's needed here (this is what
Tektronix used in the later model 310A that had silicon diode
rectifiers). The purpose of these resistors is to limit the
surge current through the rectifier diodes when power is first
applied (when the filter capacitors essentially represent a
short circuit for the first few milliseconds).

Carl


--- In TekScopes@yahoogroups.com, "stan mcintosh" <mcintosh@t...> wrote:
Several people have emphasized that I need to be sure to include
10Ω dropping resistors for the silicon diode bridges that are
replacing the selenium bridges.

Question: what wattage? Seems like 10W will be good for the -150
line, but I don't have more than one 10Ω/10W resistor in le boxe du
junque. Is 10W overkill for the other two bridges? If not, I can go
by and see if Radio Shack still carries them.

stan

[Non-text portions of this message have been removed]


Tek 310: 10Ω dropping resistors for diode bridges

stan mcintosh <mcintosh@...>
 

Several people have emphasized that I need to be sure to include 10Ω dropping resistors for the silicon diode bridges that are replacing the selenium bridges.

Question: what wattage? Seems like 10W will be good for the -150 line, but I don't have more than one 10Ω/10W resistor in le boxe du junque. Is 10W overkill for the other two bridges? If not, I can go by and see if Radio Shack still carries them.

stan

[Non-text portions of this message have been removed]


Re: Search cross references for a Diodes for Tek 2211

magicdibool <magicdibool@...>
 

Ok, Thanks for all your answers

I will buy on Radiospares the Diode 1N5402.

Thanks John B for the means of the the markings on the diode
And it's the first time that they are a problem on this Oscilloscope

Thanks a lot for your help

Cédric



--- In TekScopes@yahoogroups.com, Fred Olsen <fwolsen@e...> wrote:
magicdibool wrote:
ZM
IN
5402
9010
Cedric, as has been said that is an ordinary diode. However, do
take
note that when you search for or enquire about the part be sure to
look
for a 1N5402, >>1<<N5402, not "I".

The "9010" is only the date code; week 10 of 1990.

Best of luck,
Fred
--
<><
--
Outgoing checked by Norton AV


Re: Search cross references for a Diodes for Tek 2211

eboytoronto
 

Hi,

This diode is 3A 100V generic Line frequency type rectifier. The markings:

ZM identifies the manufacturer or their location

IN
5402

Is the JEDEC part Number.

9010

Is the date code: 10th week of 1990.

The diode can be replaced with 1N5402,3,4,5,6 These are progressively high working voltages.

Just one word of caution:

If the diode looks like it is in the secondary side of a switch mode power supply and the soldering looks like it has been replaced before, then it should probably be a fast recovery diode. I would recommend MUR420 or similar from Motorola (now On-semi).

Maybe another member of the group can comment ?

Regards,


John Barnes

---------- Original Message ----------------------------------
From: "magicdibool" <magicdibool@freesurf.fr>
Date: Tue, 16 Sep 2003 13:13:11 -0000

I have a problem with a Tektronix scopes 2211.
The diode CR903 of the power supply board is HS

On the diode, it's wright
ZM
IN
5402
9010

I am looking for a cross reference.
I had looking on site http://www.sphere.bc.ca/test/tekequiv.html
but I didn't found any

Can you help me ???



Thanks



Cedric





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



Re: Search cross references for a Diodes for Tek 2211

Craig Sawyers <c.sawyers@...>
 

On the diode, it's wright
ZM
IN
5402
9010
That is a bog-standard 1N5402. 3A average, 200A peak, 200V reverse. Costs
around 20c from just about any electronics supplier (mouser etc if you are
US, RS or Farnell if in Europe).

Craig


Search cross references for a Diodes for Tek 2211

magicdibool <magicdibool@...>
 

I have a problem with a Tektronix scopes 2211.
The diode CR903 of the power supply board is HS

On the diode, it's wright
ZM
IN
5402
9010

I am looking for a cross reference.
I had looking on site http://www.sphere.bc.ca/test/tekequiv.html
but I didn't found any

Can you help me ???



Thanks



Cedric


Capacitor question 180uf and 250 uf

CAT
 

Just wanted to thank the group again for the great support.
tbfowler for the advice "in practice" and jbarnes and GHildebrand for
the theoretical advice.
Miroslav. Thanks for taking the time to explain the ins and outs...
fascinating read.

I wish I had found this site a long time ago!

Best wishes

Steve


Re: The Tek vs. Lavoie etc. Lawsuit

Miroslav Pokorni
 

I believe that law suite was filed against Federal Goverment, not Lavoie or
others. As I remember the story, goverment gave Tektronix' scope to
prospective competitors and asked them to make a copy and quote production
price. Intent was to get an instrument at the cost lower than what Tektronix
was charging.

I just wander if that was an idea of a predecessor of McNamara's 'wiz kids'.
Such a disregard for laws, not to talk about ethics.

Regards

Miroslav Pokorni

----- Original Message -----
From: "mcinsand" <mcintosh@triad.rr.com>
To: <TekScopes@yahoogroups.com>
Sent: Friday, September 12, 2003 5:41 PM
Subject: [TekScopes] The Tek vs. Lavoie etc. Lawsuit


I have looked through the archives for information on the big scope
lawsuit, but did not see dates for when the offending scopes appeared
or when the suit was filed. I am just curious.

I have a Lavoie TS-239/UP in working order, with the government
property tag still fixed to the front. It was apparently kept at
Redstone Arsenal. Actually, I was surprised with the ease of
getting/keeping it going, and I was impressed at the features given
the time period. The frame has a JAN inspection date of 1950. Was
Lavoie just a good company gone bad?

Thanks.

stan


Re: link to some information about the 570 curve tracer

Miroslav Pokorni
 

----- Original Message -----
From: "Fred Olsen" <fwolsen@execpc.com>
To: <TekScopes@yahoogroups.com>
Sent: Sunday, September 14, 2003 3:15 PM
Subject: Re: [TekScopes] link to some information about the 570 curve tracer

And there were the notorious TU-4 copies of the B-29.
And crews of those B-29 that were used to make a copy of, were interned,
because Russians were 'neutrals' in war with Japan. To top it up, expenses
for keeping interned crews were billed to US and to my surprise, those
gallant allies were paid, just as they were paid for several crews from
Jimmy Doolittle's flight over Tokyo.



but never "they" walked on the moon ...
There are those who think they crashed there though.
There might be those who believe it, but I understand that their 'Moon
Rocket' never wandered too far from the launch pad.

When pictures of their ballistic missile/turned satellite launcher, the
Sapwood, appeared in the West, there was a comment that 'there would never
be another rocket that would require 32 motors to start simultaneously and
operate without a hitch'; there were 10 fixed main engines and 12 gimbaled
verniers. The probability of success did not favor such a design. However,
the 'Moon Rocket' exceeded that engine count. I understand that moon missile
was named 'Tzar Rocket' by engine people. The rational for name is:

1.. There was a Tzar Bell, the largest bell in the world, but it never
rang, because it cracked during casting.
2.. Then there was a Tzar Cannon, the largest in the world, again, but it
never fired. It cracked during casting, too.
3.. Then came the Tzar Rocket.
In mid 90s a Frenchmen wrote a book about Russian Moon Rocket and that book
was translated into English around year 2000. It contains photographs of
handwritten notes and sketches which are supposed to be from diary of Chief
Engineer, Korolev (he died before or soon after second failure, presumably
from natural causes); the same guy was Chief Engineer on Sapwood and most
subsequent missiles. One of sketches points to one of engines that failed
during first try. However, people who built engines are adamant that engines
operated flawless. According to them, in first test one of engines was
commanded to shut down without good reason. In the second test missile went
unstable (i.e. went to corkscrew flight) and had to be destroyed. There was
a whole bunch of engines built, but there was no other missile built, the
project was abandoned.

Even Frenchman admits that there were only two missiles built and both
failed quite miserably.



Regards

Miroslav Pokorni


T922 Oscilloscope

computer_wizzzz26 <computer_wizzzz26@...>
 

anyone have any links where I can download a manual for this
model?? .pdf file, or any other? Any info appreciated.

Thanks


Tek "tackle boxes"

Robert Morein <morepub@...>
 

Does anyone have one of those "tackle boxes" for probe storage they would like to sell?


Re: 453

Robert Morein <morepub@...>
 

Your scope has the EMI shielding package.
If you are working with weak RF signals, it prevents interference by RF coming from the scope.

----- Original Message -----
From: Samuel
To: TekScopes@yahoogroups.com
Sent: Monday, September 15, 2003 7:13 PM
Subject: [TekScopes] 453


I got a tektronix 453 scope and wonder about the metalnet infront of
the screen. Is it ok to remove that or is it there for any good purpose?


Yahoo! Groups Sponsor
ADVERTISEMENT




Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.

178741 - 178760 of 183728