Date   
Re: Tektronix 532 LV rail shorted

randolphbeebe@...
 

John,

The Tek# for the transformer that is installed in the scope is 120-105. That would be great if you had one.

The 532 manual lists that as the part number for 234V operation and 120-056 for 117V operation. Weird. But the scope is clearly placarded as being wired for 117V. so I am going to stick with the part number of the transformer that is installed now.

Randy

Re: BEWARE of TEK MADE RELAYS

 

Just operating the relay with a function generator at about 5Hz for a few seconds will often sort these relays out. Putting some AC across the contacts at a few mA at the same time won't harm either.

David

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Glenn Little
Sent: 23 January 2020 11:47
To: TekScopes@groups.io
Subject: Re: [TekScopes] BEWARE of TEK MADE RELAYS

What is the failure mode of these relays?
If it is contact resistance, they can possibly be recovered by operating
the relay with AC on the contacts.
This is a common problem in some Harris radios.
Glenn

On 1/23/2020 12:22 AM, Dennis Tillman W7PF wrote:
I wanted to make everyone aware of the very poor reliability of certain Tek made relays. Almost every Tek made component was higher quality than industry made components. This is an exception. I think the person Tek hired to oversee the design and manufacture of these relays was a few crayons short of a full box.
These relays are easy to recognize by their light sandy-gray color. They have from 5 to 8 pins made of thin, but stiff, wire on the bottom in two rows of 4 pins. The pins are on 0.1" centers. The PCB will have small single pin sockets in it of the appropriate quantity (8, 7, 6, or 5) and pattern that the relay will be inserted into.
I saved all of these relays from some 7000 parts mules I had. Occasionally I would need one to fix another plugin. I was often puzzled when I substituted one that I saved as future replacement for the bad one because the replacement relay didn't fix the problem or, worse, it created another problem elsewhere. Eventually I discovered the replacement was also bad. After encountering this a few times I made a little test fixture with LEDs on the NO and NC contacts and a push button to energize the coil. This allowed me to quickly test each relay I took from the parts mules and see which relays worked and which were bad. I had close to 100 of these relays and my test fixture found almost 50% were not usable. This confirmed what a few other Ex-Tek folks told me about these relays.

The relays are 0.632" (16mm) long x 0.327" (8.4mm) wide x 0.590" (15mm) high
They were used in a wide variety of things that Tek made in the late 1960s through the mid-1970s.
The 576, 7A11, 7A12, 7A13 Mechanical and Digital, 7A14, and other instruments use them.
Typical part numbers are 148-0034-xx, -0035-, -0044-, -0054-, -0063-, and -0088-.
These are the part numbers versions I have. There are other part numbers as well.

The round CRT Tek bug is on one side of the relay.
The circuit diagram is on the other side of the relay. Below the circuit diagram is the 148-xxxx-xx part number.
Above the circuit diagram is the coil voltage, mine are all 15V.
The coil impedance is also above the circuit diagram. My coils are 600 ohm or 1000 ohm.
The large 3 digit number stamped in ink on the top of the relay is a date code and not significant.
Some relays also have a red dot on the top which doesn't seem to be important either.
The relays are 0.632" (16mm) long x 0.327" (8.4mm) wide x 0.590" (15mm) high.

Fortunately these are not as prevalent as tantalum capacitors.
Dennis Tillman W7PF


--
-----------------------------------------------------------------------
Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign: WB4UIV wb4uiv@... AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) USSVI LM NRA LM SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"

Re: PIN Diodes used in Tek products

GerryR
 

Miguel,
The GE Tunnel Diode Handbook (from 1961) describes tunnel diodes and back diodes and can be downloaded online. The Micro-semi PIN Diode Circuit Designers Handbook is, likewise, available. Outside of knowing that Gunn diodes are used for making microwave oscillators, I have no background with them.
Best regards,
GerryR
KK4GER

----- Original Message -----
From: "Miguel Work" <harrimansat@...>
To: <TekScopes@groups.io>
Sent: Wednesday, January 22, 2020 3:00 PM
Subject: Re: [TekScopes] PIN Diodes used in Tek products


Which are the differences between:

Tunnel diode
Back diodes
Pin diodes
Gunn diode

:)

?

-----Mensaje original-----
De: TekScopes@groups.io [mailto:TekScopes@groups.io] En nombre de GerryR
Enviado el: miércoles, 22 de enero de 2020 19:30
Para: TekScopes@groups.io
Asunto: Re: [TekScopes] PIN Diodes used in Tek products

Gary,
Link to where on Ebay I purchased the tunnels:
https://www.ebay.com/itm/Set-10-Tektronix-152-0125-01-4-7mA-TUNNEL-DIODES-replaces-1N3717-TD-3A-Tested/312810709201?hash=item48d4f8a0d1:g:ft4AAOSwsdJdoQL0

GerryR


----- Original Message -----
From: "Greg Muir via Groups.Io" <big_sky_explorer=yahoo.com@groups.io>
To: <TekScopes@groups.io>
Sent: Wednesday, January 22, 2020 1:20 PM
Subject: Re: [TekScopes] PIN Diodes used in Tek products


Dave,

While looking at diode data for Gary I noticed that your 5082-3080 part has
a standard part number of 1N5767. This device is available.

Greg








Re: BEWARE of TEK MADE RELAYS

Glenn Little
 

What is the failure mode of these relays?
If it is contact resistance, they can possibly be recovered by operating the relay with AC on the contacts.
This is a common problem in some Harris radios.
Glenn

On 1/23/2020 12:22 AM, Dennis Tillman W7PF wrote:
I wanted to make everyone aware of the very poor reliability of certain Tek made relays. Almost every Tek made component was higher quality than industry made components. This is an exception. I think the person Tek hired to oversee the design and manufacture of these relays was a few crayons short of a full box.
These relays are easy to recognize by their light sandy-gray color. They have from 5 to 8 pins made of thin, but stiff, wire on the bottom in two rows of 4 pins. The pins are on 0.1" centers. The PCB will have small single pin sockets in it of the appropriate quantity (8, 7, 6, or 5) and pattern that the relay will be inserted into.
I saved all of these relays from some 7000 parts mules I had. Occasionally I would need one to fix another plugin. I was often puzzled when I substituted one that I saved as future replacement for the bad one because the replacement relay didn't fix the problem or, worse, it created another problem elsewhere. Eventually I discovered the replacement was also bad. After encountering this a few times I made a little test fixture with LEDs on the NO and NC contacts and a push button to energize the coil. This allowed me to quickly test each relay I took from the parts mules and see which relays worked and which were bad. I had close to 100 of these relays and my test fixture found almost 50% were not usable. This confirmed what a few other Ex-Tek folks told me about these relays.

The relays are 0.632" (16mm) long x 0.327" (8.4mm) wide x 0.590" (15mm) high
They were used in a wide variety of things that Tek made in the late 1960s through the mid-1970s.
The 576, 7A11, 7A12, 7A13 Mechanical and Digital, 7A14, and other instruments use them.
Typical part numbers are 148-0034-xx, -0035-, -0044-, -0054-, -0063-, and -0088-.
These are the part numbers versions I have. There are other part numbers as well.

The round CRT Tek bug is on one side of the relay.
The circuit diagram is on the other side of the relay. Below the circuit diagram is the 148-xxxx-xx part number.
Above the circuit diagram is the coil voltage, mine are all 15V.
The coil impedance is also above the circuit diagram. My coils are 600 ohm or 1000 ohm.
The large 3 digit number stamped in ink on the top of the relay is a date code and not significant.
Some relays also have a red dot on the top which doesn't seem to be important either.
The relays are 0.632" (16mm) long x 0.327" (8.4mm) wide x 0.590" (15mm) high.

Fortunately these are not as prevalent as tantalum capacitors.
Dennis Tillman W7PF


--
-----------------------------------------------------------------------
Glenn Little ARRL Technical Specialist QCWA LM 28417
Amateur Callsign: WB4UIV wb4uiv@... AMSAT LM 2178
QTH: Goose Creek, SC USA (EM92xx) USSVI LM NRA LM SBE ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"

Re: What Tektronix means to me - Modern Times

Leo Bodnar
 

I have great respect for what Tek did before fully digital scopes.
How can't you when every other worthy appnote has images of JW's famous 556 with damaged screen?!

However, to me, Tektronix has died since the time they started making plastic shoeboxes with a carrying handle on top. Nothing Tek produced since 1990's makes me excited or even curious. I had 2465A scope and loved it to bits but nothing I see from current range makes my heart beat faster.

It turns out I have only one Tek instrument - CSA803 (I have three of them because I don't want to be caught out when one dies.)
The rest, about 98% are HP, Marconi, R&S, LeCroys, Anritsu etc. Most of the instruments were bought 50% due to need and 50% because I really wanted one. Ironically, the only Tek I have (CSA803) was given to me by my friend who had to get rid of it due to moving into a smaller flat in Paris.

Neither PSPL or Keithley are part of Tek family - to me...

So here we go... Am I sick? Am I alone in this or is this sad truth that is not usually talked about?
Please tell me that there are still people who are irrationally in love with modern Tektronix!

Cheers
Leo

Re: What Tektronix means to me

Tam Hanna
 

Hello,

first of all, I meant thing not think. Sorry, I am not doing well.


As for the bathroom: please no!


Tam



--
With best regards
Tam HANNA

Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at https://www.instagram.com/tam.hanna/

Re: BEWARE of TEK MADE RELAYS

Tam Hanna
 

Hello Folks,

now I am somewhat "horny".


Does anyone of you have a DEAD relais or two to spare, to send my way? Ill pay shipping and whatever the metal of the dead POS is worth, plus a red bull for the effort.


The size is so big that one should, IMHO, be able to build something


Tam

--
With best regards
Tam HANNA

Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at https://www.instagram.com/tam.hanna/

Re: What Tektronix means to me

Tom Gardner
 

On 23/01/20 02:58, Tam Hanna wrote:
But: seriously. IMHO, SmallTalk is what did Danaher in.
But: seriously. In that case presumably you think Smalltalk also did HP in, because HP used it embedded inside some of their test equipment. (Colorado Springs used Digitalk's Smalltalk/V, there may have been others elsewhere)

Especially the idiocy of having both SmallTalk and Java on the think,
HP also had Java "on the think", whatever that means. But not considering Java enough (i.e. HotSpot) was one of the nails in the Itanic.

But this is too off topic for my taste.

Re: What Tektronix means to me

Dave Seiter
 

LOL!  On the other hand, a shower might be a good place to clean a properly prepared scope (5xx series), especially in cold weather.  (When she's not there, of course!)
-Dave

On Wednesday, January 22, 2020, 09:50:03 PM PST, Mlynch001 <@mlynch001> wrote:

I fear that this is happening to me.  My workshop is so full, it is forcing my motorcycles and cars outside and taking over my home office as well.  Not encroaching into the bathroom, but getting close.  I am certain that my wife will not have anything good to say if the bath starts to fill with scopes.


--
Michael Lynch
Dardanelle, AR

Re: What Tektronix means to me

Mlynch001
 

I fear that this is happening to me. My workshop is so full, it is forcing my motorcycles and cars outside and taking over my home office as well. Not encroaching into the bathroom, but getting close. I am certain that my wife will not have anything good to say if the bath starts to fill with scopes.


--
Michael Lynch
Dardanelle, AR

2246 Mod A Repair Question

Dave Trainor
 

Guys, need to ask for some advise. Here is the background:
Ex-USMC 2246 Mod 6 Scope 1998 warranty date.

Purchased by me in 2007, been working perfectly and passed all checks and
to the best of my calibration capabilities (TM500 modules) been working
perfectly for my needs in Ham Radio Repair.

Week after Christmas, Turn On - Pop sizzle sound, horizontal trace
jumped vertically, scope turned off. Smell of letting the smoke out of
something, not strong but distinct.

Attempts to turn on, result in the whirr/click of the PS resetting itself
over and over, scope never powers up.

Ah-Ha I said power supply failure. Found good website of fellow who
recapped a 2245 and had the mouser part numbers and so on - bought the
caps, re-capped the unit.

Same result, whir/whine/click.

Found a 2246 1Y on E-place and bought it, it had been dropped obviously
on left corner enough to break plastic rear, but seller says it powers on.

Arrived, swapped power supply, same whir/click. Hey lets put my
re-capped power supply in the dropped unit - whoh it wooers it up no
problem, but that scope took damage to mainboard and maybe CRT not sure.
However I now have one recapped power supply, and one fro the damaged
scope both are good.

Tried swapping Processor Boards, 1Y and Mod A can be swapped same
connector location. Makes no difference, the problem is not isolated to
the mainboard. The dropped unit has a cracked and obviously damaged
mainboard no help in board swapping there.

Found and bout a 2246 Tektronix mainboard on E_play again. It arrives,
its a 2246 board, not mod A or even 1Y - connector cables are different
lengths to the processor board, but hey it powers up and does show a blue
dot center of screen but its obviously not going to work as I need a 1Y or
Mod A board replacement. Was fun swapping mainboards. Proved I could dd
it.

So after this novel, I have a 2246 Mod A mainboard that has some type of
short preventing the power supply from coming up, after repeated scans
with 10X magnification and nose not a single part that looks like it went
bad. Power supply filter caps are electrolytic, every parts looks good to
both visual and smell test. It will not power up to preform ay testing.

How DO I proceed in trying to fix this? I like the scope. I should be
able to fix this even as a long time IT guy an only a amateur tech but I
can make Voltagee readings if the power supply won¹t start when connected.
No way to know, is the the +15, -15, +5, -5 or other supply that¹s
shorted and causing it not to start.

Any ideas? Or Anyone need a very nice 2246 ModA CRT? Really giving up
is frustrating. Just not sure what else I can do.

Sorry for the lengthy novel. Full story nothing held back. If I should
give up just tell me.


73 - Dave N8ZFM

Re: BEWARE of TEK MADE RELAYS

Mlynch001
 

Wonderful! Thanks for pointing this out. I have a few of these that I bought for my Type 576 as "just in case" parts. The ones I bought are bright white, not grey colored. Otherwise they are as you have described. I do not supposed that the color makes any difference? So far, no failures on my 2 machines so equipped.

Thanks Again Dennis.

--
Michael Lynch
Dardanelle, AR

Re: What Tektronix means to me

 

Hi Tam,
Allow me to explain the bathroom quip. But first, I thought your description of the Tu-144 ferrying coal was pretty funny.

One member of TekScopes (Magic Smoke) posted that he is slowly furnishing his house with Tektronix equipment, meaning he is accumulating so much of it that it was filling up every room in his house.

Then David replied with "The trick is knowing where to stop (bathrooms come to mind!)". Which meant that you have probably gone too far when Tektronix oscilloscopes start showing up in your bathrooms. I know a few people that have a problem like Magic Smoke who started a long time ago filling the rooms in their house with Tektronix stuff. I don't have any in my bathroom yet but I'm slowly getting there and this is a very, very bad sign.

I will soon have to do something about this problem. Stay tuned everyone!

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Tam Hanna
Sent: Wednesday, January 22, 2020 6:59 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] What Tektronix means to me

Hello,

sorry, I do not get the bathroom quip.


But: seriously. IMHO, SmallTalk is what did Danaher in. Especially the idiocy of having both SmallTalk and Java on the think, and NOT EXPOSING it to "Schlomo Normalentwickler". This is like having a Tu-144 in your airline fleet and a license to fly it with passengers between Frankfurt, Beijing, P'yong Yang, Tehran and Moscow, and instead using it to ferry coal.


One of the reasons why people loved the LeCroy so much was that it gave you the feeling to have a "programmable scope". Enter an equation here, modify a screen layout there. I have seen recently some achingly cool .app files for the TriStar platform. Why nobody had the idea to release an SDK...


Tam


--
With best regards
Tam HANNA

Enjoy electronics? Join 15k7 other followers by visiting the Crazy Electronics Lab at https://www.instagram.com/tam.hanna/






--
Dennis Tillman W7PF
TekScopes Moderator

BEWARE of TEK MADE RELAYS

 

I wanted to make everyone aware of the very poor reliability of certain Tek made relays. Almost every Tek made component was higher quality than industry made components. This is an exception. I think the person Tek hired to oversee the design and manufacture of these relays was a few crayons short of a full box.
These relays are easy to recognize by their light sandy-gray color. They have from 5 to 8 pins made of thin, but stiff, wire on the bottom in two rows of 4 pins. The pins are on 0.1" centers. The PCB will have small single pin sockets in it of the appropriate quantity (8, 7, 6, or 5) and pattern that the relay will be inserted into.
I saved all of these relays from some 7000 parts mules I had. Occasionally I would need one to fix another plugin. I was often puzzled when I substituted one that I saved as future replacement for the bad one because the replacement relay didn't fix the problem or, worse, it created another problem elsewhere. Eventually I discovered the replacement was also bad. After encountering this a few times I made a little test fixture with LEDs on the NO and NC contacts and a push button to energize the coil. This allowed me to quickly test each relay I took from the parts mules and see which relays worked and which were bad. I had close to 100 of these relays and my test fixture found almost 50% were not usable. This confirmed what a few other Ex-Tek folks told me about these relays.

The relays are 0.632" (16mm) long x 0.327" (8.4mm) wide x 0.590" (15mm) high
They were used in a wide variety of things that Tek made in the late 1960s through the mid-1970s.
The 576, 7A11, 7A12, 7A13 Mechanical and Digital, 7A14, and other instruments use them.
Typical part numbers are 148-0034-xx, -0035-, -0044-, -0054-, -0063-, and -0088-.
These are the part numbers versions I have. There are other part numbers as well.

The round CRT Tek bug is on one side of the relay.
The circuit diagram is on the other side of the relay. Below the circuit diagram is the 148-xxxx-xx part number.
Above the circuit diagram is the coil voltage, mine are all 15V.
The coil impedance is also above the circuit diagram. My coils are 600 ohm or 1000 ohm.
The large 3 digit number stamped in ink on the top of the relay is a date code and not significant.
Some relays also have a red dot on the top which doesn't seem to be important either.
The relays are 0.632" (16mm) long x 0.327" (8.4mm) wide x 0.590" (15mm) high.

Fortunately these are not as prevalent as tantalum capacitors.
Dennis Tillman W7PF



--
Dennis Tillman W7PF
TekScopes Moderator

Re: PIN Diodes used in Tek products

Dave Casey
 

That's great that it's still available!
I can't vouch for it's substitution in the DC508A circuit but it appears to
work okay in the DP501.
It's also priced about 5x higher than it was when I bought mine ten years
ago.

Dave Casey

On Wed, Jan 22, 2020 at 12:20 PM Greg Muir via Groups.Io <big_sky_explorer=
yahoo.com@groups.io> wrote:

Dave,

While looking at diode data for Gary I noticed that your 5082-3080 part
has a standard part number of 1N5767. This device is available.

Greg



Re: Tel 576 relay

 

Hi Ed,
The eBay ID he provided in his post takes you to one of Pam Kidd's (daughter of Deane Kidd) listings for a brand new relay for $5.00 and $7.35 USPS Small Flat Rate Box. That is a bargain. The problem is that Peter is in Canada. The same $7.35 box going to Canada costs $26.00 which makes it a totally different situation financially.

I offered to help by suggesting he contact Pam to buy 5 or 6 of the relays and have Pam send all of them to me in the same $7.35 Flat Rate Box. We are friends and I know she will do this and probably give him a quantity discount on the relays. Those relays were notorious for their failure rate. Unlike almost every other Tek made component which was higher quality than industry made components the so called expert they hired to design their relays was far from an expert. I removed all of these type of Tek relays from some 7000 parts mules I had and occasionally would use one to fix another plugin.

I was often puzzled because the replacement relay didn't fix the problem or created another problem elsewhere. Eventually I discovered the replacement was bad. After encountering this a few times I made a little test fixture with LEDs on the NO and NC contacts and a push button to energize the coil. I could tell in an instant which relays worked and which were bad. The failure rate was almost 50%. It confirmed what other Ex-Tek folks told me about the relays.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Ed Breya via Groups.Io
Sent: Wednesday, January 22, 2020 4:33 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Tel 576 relay

I see that's one of those little Tek-made ones. I noticed some on my spare 576 boards recently - I didn't recall/realize they had used some of these. Since the 576 is a very low frequency application, you should be able to swap in regular type small relays, except for needing to adapt to the footprint and pinout. I believe this same part may be used in the 7A13 and/or 7A22, so I'd keep these kind for use in them, where it's more critical for frequency response.

Ed




--
Dennis Tillman W7PF
TekScopes Moderator

2465B Calibration CAL 06 Question

Craig Cramb
 

Need to get some clarification on the procedure steps in CAL06.
In the 2465B Service Manual 070-6863-00 pages 5-20 thru 5-21. I have made it thru steps (a.) thru (v.).
But getting unsure about step (w.) I have connected two different sine wave generators SG504 and SG5030 with the same result. What I understand is you apply a Reference Frequency of 50Khz. This gives me a trace that has a vertical angle across the screen. I adjust the amplitude of this angle trace vertically 6 divisions as described. Then when I do Step (y.) at 350 Mhz the amplitude completely fills the granule scale and is beyond the 6 divisions that step (z.) describes.

Could someone clarify what I am doing wrong and what I should be doing to make it thru these steps.

Thanks,
Craig

Re: How to unsubscribe?

Roy Morgan
 

Read down in this and every message from the list where it says "unsubscribe"

Roy Morgan
K1LKY Western Mass

On Jan 22, 2020, at 10:00 PM, devin davison <lyokoboy0@...> wrote:

Hello, I joined this list to learn a bit about tek equipment. Lots of
surplus gear was coming in at the shop I work at, and I found the
information here invaluable. Lots of very talented individuals giving very
detailed advice. This list has been invaluable, thank you.

I sold off the tek gear I have, and don't plan to get more. I work on many
large minicomputer projects, and space is at a premium, i just couldn't
justify keeping a full tek cart of equipment around anymore.

Please, how do I unsubscribe?

Thank you for all of the technical info.

--Devin D'Amico


Re: How to unsubscribe?

Mark Schoonover
 

Devin,

At the bottom of any message from this list is a link to unsubscribe.

73! Mark KA6WKE

Website: https://www.ka6wke.net

On Wed, Jan 22, 2020, 19:00 devin davison <lyokoboy0@...> wrote:

Hello, I joined this list to learn a bit about tek equipment. Lots of
surplus gear was coming in at the shop I work at, and I found the
information here invaluable. Lots of very talented individuals giving very
detailed advice. This list has been invaluable, thank you.

I sold off the tek gear I have, and don't plan to get more. I work on many
large minicomputer projects, and space is at a premium, i just couldn't
justify keeping a full tek cart of equipment around anymore.

Please, how do I unsubscribe?

Thank you for all of the technical info.

--Devin D'Amico



How to unsubscribe?

devin davison <lyokoboy0@...>
 

Hello, I joined this list to learn a bit about tek equipment. Lots of
surplus gear was coming in at the shop I work at, and I found the
information here invaluable. Lots of very talented individuals giving very
detailed advice. This list has been invaluable, thank you.

I sold off the tek gear I have, and don't plan to get more. I work on many
large minicomputer projects, and space is at a premium, i just couldn't
justify keeping a full tek cart of equipment around anymore.

Please, how do I unsubscribe?

Thank you for all of the technical info.

--Devin D'Amico